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BEGIN:VEVENT
SUMMARY:Plenary session
DTSTART;VALUE=DATE-TIME:20201216T170000Z
DTEND;VALUE=DATE-TIME:20201216T180000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5054@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: David Tong (University of Cambridge)\nProfessor Davi
d Tong is a theoretical physicist at Cambridge studying quantum field theo
ry. He is famous amongst students for his engaging lecturing and his thoro
ugh and approachable lecture notes. His research in QFT is diverse\, with
results in particle physics\, gravity\, black holes\, dualities\, string t
heory\, cosmology\, condensed matter physics\, solitons\, and geometry.\n\
nhttps://conference.ippp.dur.ac.uk/event/937/contributions/5054/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5054/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Protected states in AdS3xS3xT4 from integrability
DTSTART;VALUE=DATE-TIME:20201215T153000Z
DTEND;VALUE=DATE-TIME:20201215T160000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5045@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Suvajit Majumder (City\, University of London)\nI wi
ll briefly review the integrability setup that works in AdS3/CFT2\, in the
planar limit\, including its brane construction in type IIB string theory
. Next\, I will review algebraic Bethe ansatz(ABA) and how it is used to c
ompute spectrum of integrable models by working with the concrete example
of Heisenberg XXX spin chain. Finally\, I will use the ABA technology for
the massless modes in AdS3xS3xT4\, and use it to compute the protected spe
ctrum of states in this background.\n\nhttps://conference.ippp.dur.ac.uk/e
vent/937/contributions/5045/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5045/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Holographic Swampland
DTSTART;VALUE=DATE-TIME:20201216T153000Z
DTEND;VALUE=DATE-TIME:20201216T160000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5021@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Filippo Revello (University of Oxford)\nWe investiga
te whether Swampland constraints on the low-energy dynamics of weakly coup
led string vacua in AdS can be related to inconsistencies of their putativ
e holographic duals or\, more generally\, recast in terms of CFT data. In
the first part of the talk\, we shall illustrate how various swampland con
sistency constraints are equivalent to a negativity condition on the sign
of certain mixed anomalous dimensions. This condition is similar to well-e
stablished CFT positivity bounds arising from causality and unitarity\, bu
t not known to hold in general. Our analysis will include LVS\, KKLT\, pe
rturbative and racetrack stabilisation\, and we shall also point out an in
triguing connection to the Distance Conjecture. In the second part\, we sh
ow how a different\, recently derived inequality on mixed anomalous dimens
ions maps to novel constraints on four-derivative interactions on AdS. As
an application\, we use this to constrain the interactions of scalars with
a non standard kinetic term\, finding in particular that the DBI action f
or multiple scalar fields is at the boundary of the allowed region.\n\nhtt
ps://conference.ippp.dur.ac.uk/event/937/contributions/5021/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5021/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Analytical Approximations for Curved Primordial Power Spectra
DTSTART;VALUE=DATE-TIME:20201215T160000Z
DTEND;VALUE=DATE-TIME:20201215T163000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5024@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ayngaran Thavanesan (University of Cambridge)\nWhils
t interpretations of the level of experimental support for a curved presen
t-day universe differ\, universe models with percent-level spatial curvatu
re remain compatible with CMB datasets. The inflationary framework success
fully predicts the minimal present-day curvature. However\, if one is to s
tudy inflation in a complete manner\, one cannot assume a flat universe at
the start of the expansion. There are also other theoretical reasons to c
onsider the effect of curvature\; particularly for the studies of inflatio
n exits and quantum gravity.\n\nThis motivates us to study the effects of
primordial curvature. In this work\, we generalize the potential-independe
nt inflationary model\, popularized by Contaldi et al.\, to the curved cas
e. We demonstrate that the Contaldi approximation still holds for the case
of curved universes\, and allows us to clearly illustrate the generic cut
-off and oscillatory effects seen in numerically computed curved primordia
l power spectra. Through our analytical solutions\, we are able to gain a
better insight into the physics of curved inflating universes. We also dis
cuss the possibility of developing our framework to include potential depe
ndence.\n\nhttps://arxiv.org/abs/2009.05573\n\nhttps://conference.ippp.dur
.ac.uk/event/937/contributions/5024/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5024/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Never have I ever used a constant to fix my problem
DTSTART;VALUE=DATE-TIME:20201216T123000Z
DTEND;VALUE=DATE-TIME:20201216T130000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5037@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Bruno Bento (University of Liverpool)\nWas it callin
g it a blunder the actual blunder? The cosmological constant has always be
en controversial\, to say the least. The past 20 years have seen an uprisi
ng of the cosmological constant\, after the discovery in 1998 that the exp
ansion of the universe is actually accelerating. This forced String Theory
to try to accommodate de Sitter backgrounds into its 4d solutions\, somet
hing that has proved difficult to accomplish. However\, just as Inflation
seems to be best dealt with using slowly rolling scalar fields rather than
a de Sitter vacuum\, so may the current expansion be driven by such field
s\, in what is known as Quintessence. In this talk I will address the prob
lem with the cosmological constant\, explain how Quintessence can provide
an alternative\, notwithstanding its own difficulties\, and how this can b
e accomplished in String Theory.\n\nhttps://conference.ippp.dur.ac.uk/even
t/937/contributions/5037/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5037/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-SUSY String Phenomenology from Z$_2\\times$Z$_2$ Heterotic Orb
ifolds
DTSTART;VALUE=DATE-TIME:20201216T120000Z
DTEND;VALUE=DATE-TIME:20201216T123000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5015@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Benjamin Percival (Liverpool University)\nWe explore
the space of non-SUSY string models via two distinct routes: the tachyon-
free O(16)$\\times$O(16) heterotic string in 10D and a tachyonic 10D heter
otic string. We classify 4D Z$_2\\times$Z$_2$ orbifolds descending from th
ese two starting points in the free fermionic construction. Having found a
potentially stable Standard-like model descending from the tachyonic 10D
vacuum in [arXiv:1912.00061](https://arxiv.org/abs/1912.00061)\, the appro
ach of taking these models on equal footing with the non-tachyonic 10D mod
els is justified provided that the tachyonic states are projected out in t
he four dimensional models. In both classes of models we find examples of
Type 0 and Type 0bar models\, i.e. models free of fermionic massless state
s and models free of twisted massless bosons\, respectively. Moving beyond
these extreme configurations we seek to classify tachyon-free vacua accor
ding to standard phenomenological criteria in both classes of model\, wher
e an SO(10) GUT is broken to the Pati-Salam subgroup. An analysis of the c
osmological constant and misaligned supersymmetry in the two classes of mo
dels finds notable vacua in both cases in which N$_b$=N$_f$ at the massles
s level.\n\nhttps://conference.ippp.dur.ac.uk/event/937/contributions/5015
/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5015/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Color/ Kinematics Duality in AdS$_4$
DTSTART;VALUE=DATE-TIME:20201216T160000Z
DTEND;VALUE=DATE-TIME:20201216T163000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5053@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Connor Armstrong (Durham University)\nIn flat space\
, the color/kinematics duality states that perturbative Yang-Mills amplitu
des can be written in such a way that kinematic numerators obey the same J
acobi relations as their color factors. This property leads to the BCJ rel
ations between Yang-Mills amplitudes and underlies the double copy to grav
itational amplitudes. \nIn this talk\, I will explore how this extends to
AdS$_4$\, where a generalised gauge symmetry can be used to enforce the Ja
cobi relations away from the flat space limit\; this lets us derive deform
ed BCJ relations. I will also review the spinor helicity in a curved backg
round\, leading to compact new expressions for 4pt Yang-Mills amplitudes i
n AdS$_4$.\n\nhttps://conference.ippp.dur.ac.uk/event/937/contributions/50
53/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5053/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Enhancing the diagnostic performance of Raman spectroscopy based b
owel cancer blood test using advanced machine learning algorithms and the
incorporation of information from the patient's medical record
DTSTART;VALUE=DATE-TIME:20201215T121000Z
DTEND;VALUE=DATE-TIME:20201215T121500Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5031@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Natalia Sikora (Swansea University)\nDiagnosing canc
er may be performed from biofluids\, utilizing Raman spectrophotometry\, m
ultiple machine learning techniques and their applications in particle det
ectors. Nonetheless\, algorithms which would allow for accurate classifica
tion model in this scenario would require incorporating the information fr
om patient's medical record. Them main challenge of this project is to des
ign an algorithm which considers both\, medical data and pre-processing bu
dget in a medical research. Several particle detector technologies\, inclu
ding a Silicon Vertex Detector\, Time Projection Chamber\, and a barrel of
scintillating bars are challenging when it comes is to distinguishing bet
ween antihydrogen annihilation and cosmic rays. Presently\, a common techn
ique to resolve this is a use of cuts based on two high-level variables fr
om the detectors for online analysis\, and boosted decision trees with hig
h-level variables in offline analysis. High-level variables are a powerful
tool for discrimination\, nonetheless slow to pre-process. This project a
ims to build both online and offline analyses that have different processi
ng budgets and reduce pre-processing time by replacing the high-level vari
ables with lower level variables. The goal is to create a small enough mod
el that can interpret raw detector output to enable a real-time online ana
lysis\, with the ultimate objective of programming an FPGA or micro-contro
ller to perform accurate\, real-time classification of detector events.\n\
nhttps://conference.ippp.dur.ac.uk/event/937/contributions/5031/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5031/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dessins d'Enfants and Machine-Learning
DTSTART;VALUE=DATE-TIME:20201215T123000Z
DTEND;VALUE=DATE-TIME:20201215T123500Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5018@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ed Hirst (City\, University of London)\nDessins d'en
fants will be introduced\, discussing their link to Calabi-Yau manifolds i
n string theory and their importance in Galois theory. Following this we w
ill briefly discuss work performed to classify a database of dessins d'enf
ants according to their Galois orbit size using machine-learning.\n\nIn re
lation to the paper: 2004.05218\n\nhttps://conference.ippp.dur.ac.uk/event
/937/contributions/5018/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5018/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sp(2N) gauge theories on the lattice.
DTSTART;VALUE=DATE-TIME:20201215T122500Z
DTEND;VALUE=DATE-TIME:20201215T123000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5006@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jack Holligan (Swansea University)\nYang-Mills theor
ies based on the Symplectic groups (denoted by $Sp(2N)$) have the potentia
l to describe a composite Higgs particle. To gain a better understanding o
f such theories\, it is important to understand the dynamics of the pure Y
ang-Mills sector as well as in the presence of fermions. A detailed study
of the glueball spectrum has been carried out for $N=1\,2\,3$ and 4 along
with an extrapolation to the large-$N$ limit. We begin a study of the meso
n spectrum as a logical continuation to these studies with a view to apply
ing the results to composite Higgs models.\n\nhttps://conference.ippp.dur.
ac.uk/event/937/contributions/5006/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5006/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards Precision QCD Calculations
DTSTART;VALUE=DATE-TIME:20201215T122000Z
DTEND;VALUE=DATE-TIME:20201215T122500Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5009@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Oscar Braun-White (IPPP\, Durham University)\nThis t
alk is an overview of infrared divergences required in precision QCD calcu
lations. The cancellation of these divergences is necessary by KLN theorem
and must be verified when predicting observables. Improvements on methods
in this type of work is necessary to extend predictions to $\\text{N}^3\\
text{LO}$ in $\\alpha_\\text{s}$\, to make comparisons with future precise
collider experiments. Antenna subtraction is discussed\, in addition to n
ew analysis identifying structure in antenna functions.\n\nhttps://confere
nce.ippp.dur.ac.uk/event/937/contributions/5009/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5009/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scheme dependence in pQCD at the four loop level
DTSTART;VALUE=DATE-TIME:20201215T123500Z
DTEND;VALUE=DATE-TIME:20201215T124000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5013@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Robert Mason (University of Liverpool)\nQuantities r
epresenting measurables in physics should not depend on the method of calc
ulating them in the underlying QFT. However\, in perturbative QCD\, comput
ations must be truncated to a finite order meaning they are only approxima
tions of the true quantity resulting in dependence on the renormalization
scheme chosen. We investigate this dependence for the Bjorken sum rule and
Adler D functions in various kinematic schemes with particular focus on t
he symmetric MOM schemes at four loops and compare with MSbar scheme behav
iour as the benchmark.\n\nhttps://conference.ippp.dur.ac.uk/event/937/cont
ributions/5013/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5013/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Higher form symmetries and geometric engineering
DTSTART;VALUE=DATE-TIME:20201215T121500Z
DTEND;VALUE=DATE-TIME:20201215T122000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5014@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Saghar Sophie Hosseini (Durham University)\nI will b
riefly introduce my research work on higher form symmetries and it's conne
ction to geometrically engineered field theories.\n\nhttps://conference.ip
pp.dur.ac.uk/event/937/contributions/5014/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5014/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the Lagrangian formulation of the double copy to cubic order
DTSTART;VALUE=DATE-TIME:20201215T120500Z
DTEND;VALUE=DATE-TIME:20201215T121000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5041@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Pietro Ferrero (University of Oxford)\nWe investigat
e the Lagrangian formulation of the double-copy correspondence between gau
ge theories and gravity\, up to the cubic order. Building on the definitio
n of the double-copy field as a convolution of two vectors\, we obtain fre
e gravitational Lagrangians as products of two Yang-Mills Lagrangians\, in
a form amenable to be easily extended to the massive case. We discuss the
origin of these results from tensionless strings and show the existence o
f gauge fixings that mix the two spin-one sectors and lead to an alternati
ve\, especially simple\, version of the free Lagrangian. We then construct
cubic vertices for the full double-copy multiplet\, comprising a graviton
\, a two- form and a scalar particle\, by means of the Noether procedure.
Both at the free and at the cubic level the result gets uniquely fixed onl
y upon imposing\, on top of gauge invariance\, a left-right Lorentz symmet
ry ruling contraction of indices among double-copy fields. Whereas the out
come nicely matches the cubic interactions of N = 0 supergravity\, includi
ng the gauge-invariant coupling between the scalar particle and the two-fo
rm\, such a twofold Lorentz symmetry seems to conflict with the perturbati
ve reconstruction of space-time geometry.\n\nhttps://conference.ippp.dur.a
c.uk/event/937/contributions/5041/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5041/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chiral Fermions on the Lattice
DTSTART;VALUE=DATE-TIME:20201215T120000Z
DTEND;VALUE=DATE-TIME:20201215T120500Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5029@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Kaan Onder (University of Cambridge)\nPutting chiral
fermions on a lattice has been a long standing problem due to the doublin
g problem. I'll briefly introduce this and talk about potential ways of so
lving it.\n\nhttps://conference.ippp.dur.ac.uk/event/937/contributions/502
9/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5029/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Coaction of Feynman Diagrams
DTSTART;VALUE=DATE-TIME:20201215T115000Z
DTEND;VALUE=DATE-TIME:20201215T115500Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5030@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Aris Ioannou (University of Edinburgh)\nResearch dev
elopments in recent years have given strong evidence that \none-loop Feynm
an diagrams admit a coaction\, a conjectural statement \nregarding the alg
ebraic and analytic structure of the corresponding \nFeynman integrals. In
this talk\, I will explain how one defines a coaction and show how it may
apply to Feynman Diagrams.\n\nhttps://conference.ippp.dur.ac.uk/event/937
/contributions/5030/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5030/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Vacuum Transitions in Field Theory
DTSTART;VALUE=DATE-TIME:20201215T115500Z
DTEND;VALUE=DATE-TIME:20201215T120000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5026@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Christopher Hughes (DAMTP\, University of Cambridge)
\nThe WKB approximation describes the decay of metastable states in quantu
m mechanics but its extension to multidimensional field theory is not triv
ial. I will give a short overview of the original Euclidean approach devel
oped by Coleman et al. in the 1980's as well as more recent approaches and
comment on the different predictions between the two.\n\nhttps://conferen
ce.ippp.dur.ac.uk/event/937/contributions/5026/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5026/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Boostless Bootstrap: Amplitudes without Lorentz boosts
DTSTART;VALUE=DATE-TIME:20201216T143000Z
DTEND;VALUE=DATE-TIME:20201216T150000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5028@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jakub Supeł (University of Cambridge)\nPoincare inv
ariance is a well-tested symmetry of nature and sits at the core of our de
scription of relativistic particles and gravity. However\, in cosmology th
e ground state breaks invariance under Lorentz boosts\, which motivated us
to study scattering amplitudes without requiring this symmetry. In partic
ular\, using on-shell methods and assuming massless\, relativistic and lum
inal particles of any spin\, I explain how the allowed interactions around
Minkowski spacetime are severely constrained by unitarity and locality in
the form of consistent factorization. In particular\, the existence of an
interacting massless spin-2 particle enforces three-particle interactions
to be Lorentz invariant\, even those that do not involve a graviton\, suc
h as cubic scalar couplings. Our findings are highly sensitive to IR defor
mations and therefore these flat-space results do not straightforwardly ap
ply to curved spacetime. Instead\, I comment on the implications to Lorent
z violating extensions of the Standard Model.\n\nhttps://conference.ippp.d
ur.ac.uk/event/937/contributions/5028/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5028/
END:VEVENT
BEGIN:VEVENT
SUMMARY:From tree-level perturbation theory to S-matrix bootstrap in two d
imensions
DTSTART;VALUE=DATE-TIME:20201216T140000Z
DTEND;VALUE=DATE-TIME:20201216T143000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5008@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Davide Polvara (Durham University)\nIn the past the
bootstrap program has been able to find analytical results for the S-matri
x of a variety of (1+1)-dimensional integrable models. Its connection to s
tandard Feynman diagrams computations is however still unclear\, in partic
ular the underlying mechanism responsible for the cancellation of all non-
elastic processes. In the talk I will show how bootstrap relations connect
ing different S-matrix elements and the absence of non-elastic scattering
emerge at tree-level from perturbation theory for the class of untwisted a
ffine Toda theories.\n\nhttps://conference.ippp.dur.ac.uk/event/937/contri
butions/5008/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5008/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black hole entropy from superconformal indices and a glimpse of bl
ack holes in AdS_5 x T^{1\,1}
DTSTART;VALUE=DATE-TIME:20201216T123000Z
DTEND;VALUE=DATE-TIME:20201216T130000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5016@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ziruo Zhang (SISSA)\nThe large N limit of the four-d
imensional superconformal index has been computed and successfully compare
d to the entropy of a class of AdS$_5$ black holes only in the particular
case of *equal* angular momenta. Using the Bethe ansatz formulation of the
index\, we found a particular universal contribution to the sum over Beth
e vacua that correctly leads to the entropy of BPS Kerr–Newman black hol
es in AdS$_5\\times$S$^5$ for *arbitrary* values of the conserved charges\
, thus completing the microscopic derivation of their microstates. We also
consider theories dual to AdS$_5\\times$SE$_5$\, where SE$_5$ is a Sasaki
–Einstein manifold. In particular\, we explicitly constructed the near-h
orizon geometry of as yet unkown BPS Kerr–Newman black holes in AdS$_5\\
times$T$^{1\,1}$. The entropies of these black holes were computed using t
he attractor mechanism and we found complete agreement with predictions fr
om the index.\n\nhttps://conference.ippp.dur.ac.uk/event/937/contributions
/5016/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5016/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Determining the Coaction of two-loop Feynman Diagrams
DTSTART;VALUE=DATE-TIME:20201216T120000Z
DTEND;VALUE=DATE-TIME:20201216T123000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5010@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Aris Ioannou (University of Edinburgh)\nThe diagramm
atic coaction is a conjectural statement regarding the algebraic and analy
tic structure of Feynman integrals. The beauty of the coaction on Feynman
diagrams is that its form can be formulated through simple diagrammatic ru
les\, based on "cutting" and "contracting" subsets of propagators\, withou
t any reference to the particular functions that the integrals evaluate to
. However\, in order to establish the coaction\, and determine its precise
structure given a particular basis of integrals\, one needs to evaluate t
he corresponding integrals and their cuts and establish the relations betw
een them. In this talk\, I will go into the techniques used for the two-lo
op cut integral evaluations to all orders in the dimensional regularizatio
n parameter $\\epsilon$ and how the results can be used to determine the d
iagrammatic coaction of two-loop Feynman Integrals.\n\nhttps://conference.
ippp.dur.ac.uk/event/937/contributions/5010/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5010/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex structures in the dynamics of Kerr black holes
DTSTART;VALUE=DATE-TIME:20201216T110000Z
DTEND;VALUE=DATE-TIME:20201216T113000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5046@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ben Maybee (University of Edinburgh)\nThe Kerr black
hole in gravity\, and its single copy $\\sqrt{\\rm Kerr}$ in gauge theory
\, are very special spinning objects. Both are intimately connected to on-
shell scattering amplitudes for particles with spin. In this talk I will s
how how insights from such amplitudes can lead to new\, complex perspectiv
es on the classical dynamics of these solutions.\n\nhttps://conference.ipp
p.dur.ac.uk/event/937/contributions/5046/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5046/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Case Against Smooth Null Infinity
DTSTART;VALUE=DATE-TIME:20201216T103000Z
DTEND;VALUE=DATE-TIME:20201216T110000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5040@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Leonhard Kehrberger (University of Cambridge)\nIn th
is talk\, I hope to discuss various physical obstructions to Penrose's pro
posal of smooth conformal compactification of spacetime (a.k.a. smooth nul
l infinity or asymptotic simplicity) and the "peeling property" implied by
it.\nMore precisely\, I will show that in the context of the $N$-body pro
blem of GR\, one should expect that the asymptotic expansions of the Weyl
tensor near $\\mathcal{I}^+$ contain *logarithmic terms* at leading order
and hence the peeling property does not hold. \nFinally\, I will outline w
hy these logarithmic terms should in principle be measurable.\n\n*Only bas
ic familiarity with GR will be assumed.*\n\nhttps://conference.ippp.dur.ac
.uk/event/937/contributions/5040/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5040/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Moduli space of five-dimensional black holes
DTSTART;VALUE=DATE-TIME:20201216T100000Z
DTEND;VALUE=DATE-TIME:20201216T103000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5042@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Fred Tomlinson (University of Edinburgh)\nThe classi
fication of equilibrium black hole solutions is a fundamental problem in G
eneral Relativity. In four spacetime dimensions this is essentially answer
ed by the black hole uniqueness theorem\, which roughly states that the on
ly asymptotically flat\, stationary black hole solution to the vacuum Eins
tein equations is the Kerr solution. In higher-dimensional spacetimes\, th
ere is no such simple uniqueness theorem - this was revealed by the striki
ng discovery of the black ring\, a black hole with horizon topology $S^2 \
\times S^1$. Alongside the spherical topology Myers-Perry black hole (the
natural higher dimensional Kerr analogue)\, this explicitly shows that eve
n vacuum black holes are not uniquely specified by their mass and angular
momenta.\n\nSo what is known about black holes in five-dimensional GR? In
this talk I will give an overview of the situation and briefly discuss a n
ew classification result leading towards a better understanding of a parti
cular class of these solutions.\n\nhttps://conference.ippp.dur.ac.uk/event
/937/contributions/5042/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5042/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Covariant multipole expansion of local currents for massive states
of any spin
DTSTART;VALUE=DATE-TIME:20201216T160000Z
DTEND;VALUE=DATE-TIME:20201216T163000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5025@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Manuel Morales (DAMTP\, University of Cambridge)\nWe
study the structure of scalar\, vector\, and tensor currents for on-shell
massive particles of any spin. When considering higher values for the spi
n of the particle\, the number of form factors (FFs) involved in the decom
position of the matrix elements associated with these local currents incre
ases. We identify all the fundamental structures that give rise to the ind
ependent FFs\, systematically for any spin value. These structures can be
conveniently organised using an expansion in covariant multipoles\, built
solely from the Lorentz generators. This approach allows one to uniquely i
dentify the terms which are universal and those that arise because of spin
. We derive counting rules which relate the number of FFs to the total spi
n j of the state\, showing explicitly that these rules match all the well-
known cases up to spin 2.\n\nhttps://conference.ippp.dur.ac.uk/event/937/c
ontributions/5025/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5025/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Double copy and homotopy algebras
DTSTART;VALUE=DATE-TIME:20201216T153000Z
DTEND;VALUE=DATE-TIME:20201216T160000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5020@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Hyungrok Kim (Heriot-Watt University)\nThere is a se
ries of deep relations between the scattering amplitudes of Yang–Mills t
heory and those of Einstein gravity\, known as *double copy*. This relatio
n has been proven at tree level\, but whether it holds at loop level has b
een a longstanding conjecture. In this talk we resolve this by constructin
g Lagrangians for Yang–Mills theory and Einstein gravity that manifest t
he double copy relation and formulate the result in terms of the theory of
homotopy algebras (L∞-\, A∞-algebras).\n\nBased on [2007.13803][1]\,
joint work with L. Borsten\, B. Jurčo\, T. Macrelli\, C. Sämann\, M. Wol
f.\n\n [1]: https://arxiv.org/abs/2007.13803\n\nhttps://conference.ippp.d
ur.ac.uk/event/937/contributions/5020/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5020/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Boundaries\, Vermas\, and Factorisation
DTSTART;VALUE=DATE-TIME:20201216T143000Z
DTEND;VALUE=DATE-TIME:20201216T150000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5005@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Daniel Zhang (University of Cambridge)\nI will discu
ss a recent work on the factorisation of closed 3-manifold partition funct
ions and indices of 3d $\\mathcal{N}=4$ gauge theories. The building block
s are hemisphere partition functions equipped with a class of UV $\\mathca
l{N}=(2\,2)$ boundary conditions that mimic the presence of isolated vacua
at infinity. Via the state-operator correspondence\, these count local op
erators supported on a $(2\,2)$ boundary condition on a plane. A subset of
these operators are boundary Higgs and Coulomb branch operators\, which f
orm lowest weight Verma modules over the quantised bulk Higgs and Coulomb
branch chiral rings. We show that certain limits of the hemisphere partiti
on functions compute their characters. We find that the equivariant supers
ymmetric Casimir energy encodes the boundary ’t Hooft anomaly\, and also
plays the role of highest weights. Applying these results to factorisatio
n then leads to various “IR formulae” for partition functions on close
d 3-manifolds in terms of these Verma characters.\n\nhttps://conference.ip
pp.dur.ac.uk/event/937/contributions/5005/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5005/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Avoided Deconfinement in Randall-Sundrum Models
DTSTART;VALUE=DATE-TIME:20201216T140000Z
DTEND;VALUE=DATE-TIME:20201216T143000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5051@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Michael Nee (Oxford University)\nIn this talk I will
discuss first order phase transitions in Randall-Sundrum models which are
dual to (de)confinement phase transitions in large-$N$ gauge theories. Th
e transition rate is suppressed by a factor $\\exp(-N^2)$\, and does not c
omplete for $N \\gg 1$\, leading to an eternally inflating phase. The cons
traint on $N$ to avoid this fate is strong enough that the RS effective fi
eld theory is only marginally under control. We present a mechanism where
the IR brane remains stabilised at very high temperature\, so that the the
ory stays in the confined phase at arbitrarily high energies. This mechani
sm of avoided deconfinement is similar to Weinberg's symmetry non-restorat
ion mechanism. Avoided deconfinement allows for a viable cosmology for pa
rametrically large-$N$ theories. Early universe phenomena such as WIMP fre
eze-out\, axion abundance\, baryogenesis and phase transitions are qualita
tively modified in the model\, leading to new possibilities for phenomenol
ogical applications.\n\nhttps://conference.ippp.dur.ac.uk/event/937/contri
butions/5051/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5051/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Classical Yang Mills observables from amplitudes
DTSTART;VALUE=DATE-TIME:20201216T110000Z
DTEND;VALUE=DATE-TIME:20201216T113000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5027@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Alasdair Ross (University of Edinburgh)\nIn this tal
k I’ll present some recent work on studying classical observables in Yan
g Mills theory. Motivated by the double copy relation between YM and Gravi
ty\, and focusing on the YM side\, I’ll discuss the classical scattering
of particles with a YM colour charge and compute the change in colour or
‘colour impulse’ that occurs during the scattering event using amplitu
des techniques.\n\nhttps://conference.ippp.dur.ac.uk/event/937/contributio
ns/5027/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5027/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Amplitudes and Backgrounds in Split Signature
DTSTART;VALUE=DATE-TIME:20201216T103000Z
DTEND;VALUE=DATE-TIME:20201216T110000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5048@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Matteo Sergola (University of Edinburgh)\nIn this ta
lk we are going to explore classical features of electromagnetic and gravi
tational radiation using quantum scattering amplitudes. To do so we analyt
ically continue to a spacetime with $(2\,2)$ signature $\\eta_{\\mu\\nu}=\
\text{diag}(+\,+\,-\,-)$. This allows us to consider\, at leading order\,
3-point on-shell amplitudes which would otherwise be identically zero in u
sual Minkowski spacetime. Our main result is that\, in the classical limit
\, the scattered state is a coherent state which is the exponential of a 3
-point amplitude. This occurs for both EM and GR radiation\, which happen
to be related to each other through the double copy. This opens up new pos
sibilities to study gravitational wave physics with quantum field theory a
nd unitarity methods.\n\nhttps://conference.ippp.dur.ac.uk/event/937/contr
ibutions/5048/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5048/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Curvy Parke-Taylors
DTSTART;VALUE=DATE-TIME:20201216T100000Z
DTEND;VALUE=DATE-TIME:20201216T103000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5004@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Atul Sharma (University of Oxford)\nI will report on
our discovery of the first-ever all-multiplicity formulae for scattering
amplitudes in curved backgrounds. This will involve certain chiral backgro
unds treated without any approximations\, a slice of twistor theory\, a ta
ste of spinor-helicity variables\, and a bit of holography for dessert. Th
e end result is a beautiful extension of the Parke-Taylor formula of MHV g
luon amplitudes from trivial backgrounds to an infinite class of self-dual
radiative gauge field backgrounds.\n\nhttps://conference.ippp.dur.ac.uk/e
vent/937/contributions/5004/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5004/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charting the Fifth Force Landscape
DTSTART;VALUE=DATE-TIME:20201216T160000Z
DTEND;VALUE=DATE-TIME:20201216T163000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5035@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Hannah Banks (University of Cambridge)\nIn recent ye
ars particle physics research has undergone somewhat of a phase transition
\, looking increasingly towards hidden sectors and the feebly interacting
frontier. In this talk I will introduce a new approach to parameterising d
ark sector forces\, underpinned by the Källén-Lehman representation\, in
which the effects of any general scalar fifth force are captured by a sin
gle positive-definite spectral function. Using this language\, I will demo
nstrate how the effects of loop-level forces can be simply obtained\, with
out needing to explicitly perform loop calculations. I will also show how
experimental observables can be expressed in completely general terms\,
facilitating the straightforward extraction of limits to any specific mode
l. Finally\, I will discuss how this framework opens the possibility to sp
eculatively probe violations of unitarity\, causality or locality within h
idden sectors.\n\nhttps://conference.ippp.dur.ac.uk/event/937/contribution
s/5035/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5035/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmological implications of EW vacuum instability: constraints on
the Higgs curvature coupling from inflation
DTSTART;VALUE=DATE-TIME:20201216T153000Z
DTEND;VALUE=DATE-TIME:20201216T160000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5050@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Andreas Mantziris (Imperial College London)\nThe cur
rent experimentally measured parameters of the Standard Model (SM) suggest
that our universe lies in a metastable electroweak vacuum\, where the Hig
gs field could decay to a lower vacuum state with catastrophic consequence
s. Our measurements dictate that such an event has not happened yet\, desp
ite the many different mechanisms that could have triggered it during our
past light-cone. Via this observation\, we can establish a promising link
between cosmology and particle physics and thus constrain important parame
ters of our theories. The focus of our work has been to explore this possi
bility by calculating the probability of the false vacuum to decay during
the period of inflation and using it to constrain the last unknown renorma
lisable SM parameter $\\xi$\, which couples the Higgs field with space-tim
e curvature. In our latest study\, we derived lower bounds for the Higgs-c
urvature coupling from vacuum stability in three inflationary models: quad
ratic and quartic chaotic inflation\, and Starobinsky-like power-law infla
tion. In contrast to most previous studies we took the time-dependence of
the Hubble rate into account both in the geometry of our past light-cone a
nd in the Higgs effective potential\, which is approximated with three-loo
p renormalisation group improvement supplemented with one-loop curvature c
orrections. We find that in all three models\, the lower bound is $\\xi \\
geq 0.051 ... 0.066$ depending on the top quark mass. We also demonstrated
that vacuum decay is most likely to happen a few e-foldings before the en
d of inflation.\n\nhttps://conference.ippp.dur.ac.uk/event/937/contributio
ns/5050/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5050/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heavy $\\to$ strange Semileptonic Decays in Lattice QCD
DTSTART;VALUE=DATE-TIME:20201216T143000Z
DTEND;VALUE=DATE-TIME:20201216T150000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5032@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: William Parrott (University of Glasgow)\n$D \\to{}K
l \\nu$ and $B \\to K l^+l^-$ are important heavy to strange semileptonic
decay processes\, giving us direct comparison with experiment\, and access
to CKM matrix elements and potential new physics.\nWe can calculate form
factors for both of these processes in lattice QCD and connect them togeth
er by determining heavy to strange form factors for heavy quark masses ran
ging from $c$ to $b$. We can also explore the connection to form factors w
ith different light quark masses.\nUsing the HISQ action on $N_f=2+1+1$\,
we demonstrate how $D\\to{}K$ calculations can be extended up towards the
$b$ mass and give preliminary $D \\to{} K$ and $B \\to {}K$ results\, in b
oth cases including results for the tensor form factor with an accurately
renormalised tensor current.\n\nhttps://conference.ippp.dur.ac.uk/event/93
7/contributions/5032/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5032/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Precise Determination of CKM Matrix Elements with Lattice QCD+QED
DTSTART;VALUE=DATE-TIME:20201216T140000Z
DTEND;VALUE=DATE-TIME:20201216T143000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5036@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Andrew Yong (University of Edinburgh)\nThe Cabibbo-K
obayashi-Maskawa (CKM) matrix is a $3\\times 3$ unitary matrix in the Stan
dard Model of particle physics. In the age of precision physics\, one of t
he ongoing efforts to extend the Standard Model is to test the unitarity o
f the CKM matrix. This requires a precise determination of its matrix elem
ents from first principles. Since quarks hadronise into bound states at $E
\\approx \\Lambda_{QCD}\\sim 300$MeV\, we will require a non-perturbative
approach to obtain theoretical predictions of hadronic observables. This i
s where Lattice QCD(+QED) comes in. In this talk\, I will present the prog
ress made by the RBC-UKQCD collaboration in determining $\\frac{V_{us}}{V_
{ud}}$ and discuss our future plans on extracting the individual matrix el
ements.\n\nhttps://conference.ippp.dur.ac.uk/event/937/contributions/5036/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5036/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finite Fields for Di-Photon Amplitudes
DTSTART;VALUE=DATE-TIME:20201216T123000Z
DTEND;VALUE=DATE-TIME:20201216T130000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5022@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Francesco Sarandrea (Durham University)\nIn this tal
k I will present the algorithms and techniques employed to efficiently obt
ain analytic expressions for loop-induced di-photon amplitudes at 5 and 6
legs . I will review the method of reconstruction over finite fields and h
ow it is applied to OPP integrand reduction at one loop. The representa
tion of the amplitudes using Momentum Twistor variables\, which ensure tha
t the process only involves rational expressions at every intermediate ste
p\, will be introduced. I will discuss advantages and current bottlenecks.
\n\nhttps://conference.ippp.dur.ac.uk/event/937/contributions/5022/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5022/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Getting a number out of a QCD amplitude
DTSTART;VALUE=DATE-TIME:20201216T120000Z
DTEND;VALUE=DATE-TIME:20201216T123000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5039@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ryan Moodie (IPPP\, Durham University)\nI will give
an introductory review of modern methods to compute QCD amplitudes in the
context of hadron collider phenomenology. We will build up the basic struc
ture of such calculations and explore the technologies used at each step.\
n\nhttps://conference.ippp.dur.ac.uk/event/937/contributions/5039/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5039/
END:VEVENT
BEGIN:VEVENT
SUMMARY:An analytical look at top tagging with N-subjettiness
DTSTART;VALUE=DATE-TIME:20201216T110000Z
DTEND;VALUE=DATE-TIME:20201216T113000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5049@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jack Helliwell (University of Manchester)\nI will ex
amine the effectiveness and resilience to non perturbative effects of vari
ous top tagging procedures which make use of n-subjettiness\, initially us
ing Monte Carlo simulations. I will then present resummed calculations\, a
t modified leading log accuracy\, of the most effective variants of these
taggers for both the signal and background. These calculations will then b
e used to understand the physics which drives these taggers\, ultimately f
acilitating the simplification of them whilst improving the performance ov
er a range of signal efficiencies.\n\nhttps://conference.ippp.dur.ac.uk/ev
ent/937/contributions/5049/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5049/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The performance and IRC safety of Spectral Clustering when Jet tag
ging.
DTSTART;VALUE=DATE-TIME:20201216T103000Z
DTEND;VALUE=DATE-TIME:20201216T110000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5034@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Henry Day-Hall (University of Southampton)\nSpectral
clustering\, developed by the machine learning community\, has been seen
to be a powerful and versatile clustering method. Jet clustering\, particu
larly in the case of a boosted topology\, is a key problem for particle id
entification in experimental physics. If spectral clustering can be shown
to be suitable for the task it may be able to extract more information fro
m the data we generate.\n\nA key factor for the suitability of an clusteri
ng algorithm is infrared and collinear (IRC) safety. While there are algor
ithms that are not IRC safe\, the most popular algorithms are. To be viabl
e for use in QCD calculations the jet formation algorithm must be IRC safe
.\n\nIn this talk I will discuss the mechanics\, performance and the IRC s
afety of spectral clustering.\n\nhttps://conference.ippp.dur.ac.uk/event/9
37/contributions/5034/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5034/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards a Quantum Computing Algorithm for Helicity Amplitudes and
Parton Showers
DTSTART;VALUE=DATE-TIME:20201216T100000Z
DTEND;VALUE=DATE-TIME:20201216T103000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5044@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Khadeejah Bepari (IPPP\, Durham University)\nThe int
erpretation of measurements of high-energy particle collisions relies heav
ily on the performance of full event generators. By far the largest amount
of time to predict the kinematics of multi-particle final states is dedic
ated to the calculation of the hard process and the subsequent parton show
er step. With the continuous improvement of quantum devices\, dedicated al
gorithms are needed to exploit the potential quantum computers can provide
. In this talk I will discuss general and extendable algorithms for quantu
m gate computers to facilitate calculations of helicity amplitudes and the
parton shower process\, as a first step towards a quantum computing algor
ithm to describe the full collision event at the LHC. This method exploits
the equivalence between spinors and qubits and harnesses the quantum comp
uter’s ability to remain in a quantum state throughout the calculations.
\n\nhttps://conference.ippp.dur.ac.uk/event/937/contributions/5044/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5044/
END:VEVENT
BEGIN:VEVENT
SUMMARY:M2- and D3-branes wrapped on a spindle
DTSTART;VALUE=DATE-TIME:20201215T160000Z
DTEND;VALUE=DATE-TIME:20201215T163000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5043@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Pietro Ferrero (University of Oxford)\nWe consider t
he Plebanski-Demianski family of solutions of minimal gauged supergravity
in d=4\, which describes an accelerating\, rotating and charged black-hole
in AdS4. The 4d metric has conical singularities\, but we show that it ca
n uplifted to a completely regular solution of d=11 supergravity. We focus
on the supersymmetric and extremal case\, where the near-horizon geometry
is AdS2 x \\Sigma\, where \\Sigma is a spindle\, or weighted projective s
pace. We argue that this is dual to a d=1\, N=(2\,0) SCFT which is the IR
limit of a 3d SCFT compactified on a spindle. This\, in turn\, should be r
ealized holographically by wrapping a stack of M2-branes on a spindle. Suc
h construction displays two interesting features: 1) supersymmetry is real
ized in a novel way\, which is not the topological twist\, and 2) the R-sy
mmetry of the d=1 SCFT mixes with the U(1) isometry of the spindle. A simi
lar idea also applies to a class of AdS3 x \\Sigma solutions of minimal ga
uged supergravity in five dimensions.\n\nhttps://conference.ippp.dur.ac.uk
/event/937/contributions/5043/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5043/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards an M5-Brane Model
DTSTART;VALUE=DATE-TIME:20201215T153000Z
DTEND;VALUE=DATE-TIME:20201215T160000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5017@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Dominik Rist (Heriot-Watt University)\nHigher gauge
theory is an extension of gauge theory in which one adds higher degree for
ms to generalize the concept of connection. This nascent field has been pl
agued by a lack of concrete non-trivial examples relevant to physics. In t
his talk we review the recent progress in constructing a model for a (1\,0
) superconformal field theory in 6 dimensions containing a non-abelian ten
sor multiplet using Sen’s Lagrange multiplier approach and an object fro
m higher gauge theory known as a string structure.\n\nhttps://conference.i
ppp.dur.ac.uk/event/937/contributions/5017/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5017/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Factorised 3d N=4 orthosymplectic quivers
DTSTART;VALUE=DATE-TIME:20201215T143000Z
DTEND;VALUE=DATE-TIME:20201215T150000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5033@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Mohammad Akhond (Swansea University)\nI will discuss
families of 3d N=4 quiver gauge theories with unitary\, orthogonal and sy
mplectic gauge nodes that factorise into pairs of decoupled sectors. Each
decoupled sector corresponds to a quiver gauge theory comprised solely of
unitary nodes. I will then discuss the motivation behind this conjecture a
s well as the currently available evidence/tests.\n\nhttps://conference.ip
pp.dur.ac.uk/event/937/contributions/5033/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5033/
END:VEVENT
BEGIN:VEVENT
SUMMARY:An Introduction to moduli spaces of 3d N=4 SUSY quiver gauge theor
ies
DTSTART;VALUE=DATE-TIME:20201215T140000Z
DTEND;VALUE=DATE-TIME:20201215T143000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5038@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Kirsty Gledhill (Imperial College London)\nThis talk
is aimed at those who may be unfamiliar with many concepts that appear in
the title. To this end\, the topic will be broken down thoroughly\, and a
long the way some basic concepts will be reviewed. It hopes to give an und
erstandable and simple introduction into the rich field of supersymmetric
quiver gauge theories. The ideas of gauge theories and group theory will
be briefly reviewed\, before discussing N=4 supersymmetry in 3 dimensions
and the structure of the moduli space of vacua of theories with such symme
try. The quiver formulation of such theories is presented\, showing how to
encode all the important information in a simple diagram. Motivations and
directions of study are discussed. If time permits\, a link to string the
ory will be established through the realisation of gauge theories on the w
orld volume of Dirichlet branes.\n\nhttps://conference.ippp.dur.ac.uk/even
t/937/contributions/5038/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5038/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Synthetic Flux Attachment
DTSTART;VALUE=DATE-TIME:20201215T140000Z
DTEND;VALUE=DATE-TIME:20201215T143000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5012@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Gerard Valentí-Rojas (Heriot-Watt University)\nFlux
attachment is a mechanism by which charged particles capture magnetic flu
x quanta and form composite entities. As a consequence of flux dressing\,
these composites may acquire fractional quantum numbers (e.g. electric cha
rge) and statistics. This phenomenon is directly associated to the emergen
ce of a Chern-Simons gauge field.\n\nAlthough charge-neutral systems do no
t couple to vector potentials\, geometric (Berry) phases induced in ultrac
old neutral atoms allow emulating the behaviour of charged particles in el
ectromagnetic fields. Nowadays\, these phases can be engineered in Bose-Ei
nstein condensates by means of laser coupling.\n\nWe describe how a suitab
le interaction of this light-matter system generates an effective singular
nonlinear gauge potential. Such a field is a function of matter density a
nd performs a laser-tuned version of flux attachment. We derive bottom-up
the macroscopics (i.e. emergence) of an Abelian Chern-Simons theory from a
microscopic\, weakly-interacting system of bosons. We find that the effec
tive description of the condensate is that of a fractional quantum Hall fl
uid where anyonic flux-charge vortices are formed. Finally\, we outline th
e implementation of the current scheme and its implications as a quantum s
imulation of a gauge theory in 2+1D that uses a single atomic species only
.\n\nhttps://conference.ippp.dur.ac.uk/event/937/contributions/5012/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5012/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Multi-winding Magnetic Fluxtubes in Colour-superconducting Quark M
atter
DTSTART;VALUE=DATE-TIME:20201215T143000Z
DTEND;VALUE=DATE-TIME:20201215T150000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5047@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Geraint Evans (University of Southampton)\nI will pr
esent results analysing the phase structure of dense\, three-flavour\, col
our-superconducting quark matter in the presence of an external magnetic f
ield using a Ginzburg-Landau approach. By contrasting with the massless ca
se\, I will discuss how the preferred magnetic defects in the type-II 2SC
phase and overall phase diagram are affected when we consider the strange
quark mass to be non-zero.\n\nhttps://conference.ippp.dur.ac.uk/event/937/
contributions/5047/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5047/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Soft Anomalous Dimension in QCD
DTSTART;VALUE=DATE-TIME:20201215T160000Z
DTEND;VALUE=DATE-TIME:20201215T163000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5011@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Niamh Maher (University of Edinburgh)\nAn introducti
on to the Soft Anomalous Dimension in QCD with a focus on the diagrammatic
color structures that appear in it. The factorisation of scattering ampli
tudes into hard\, soft and jet parts allows us to focus on the soft matrix
. The Soft Anomalous Dimension contains the IR singularities and can be re
presented in terms of Wilson lines which will be discussed.\n\nhttps://con
ference.ippp.dur.ac.uk/event/937/contributions/5011/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5011/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QCD Instantons at hadron colliders
DTSTART;VALUE=DATE-TIME:20201215T153000Z
DTEND;VALUE=DATE-TIME:20201215T160000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5019@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Daniel Milne (IPPP\, Durham University)\nInstantons
are non-perturbative phenomena arising in field theory with degenerate vac
ua. They are one of the few remaining predictions of the Standard Model th
at has not been experimentally observed. Discovering instantons at a colli
der would be another piece of evidence for our current model of QCD and he
lp to understand the vacuum structure of the standard model.\n\nWe will di
scuss the most recent calculation of the instanton cross section at hadron
colliders before moving on to discuss their collider signature. We talk a
bout shape variables as possible discriminating variables and how we might
potentially discover instantons at the LHC. \n\n[talk based on https://ar
xiv.org/abs/2010.02287]\n\nhttps://conference.ippp.dur.ac.uk/event/937/con
tributions/5019/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5019/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Machine Learning Surrogates for Rapid Dark Matter Direct Detection
Calculations
DTSTART;VALUE=DATE-TIME:20201215T140000Z
DTEND;VALUE=DATE-TIME:20201215T143000Z
DTSTAMP;VALUE=DATE-TIME:20210801T174954Z
UID:indico-contribution-937-5052@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Dorian Amaral (IPPP\, Durham University)\nDark matte
r direct detection is one of the most popular ways of searching for WIMP d
ark matter. However\, the calculations involved when evaluating the recoil
spectra can be expensive\, especially when exploring the multi-dimensiona
l parameter space resulting from the EFT description of dark matter and th
e inclusion of astrophysical uncertainties. Therefore\, it is instructive
to seek ways of accelerating this calculation. We explore the performance
of several possible surrogate models which can replace the exact calculati
on\, with a focus on machine learning models. We find that relatively simp
le surrogate models can adequately approximate the complete calculation wi
th a sizeable jump in performance.\n\nhttps://conference.ippp.dur.ac.uk/ev
ent/937/contributions/5052/
LOCATION:Centre for Particle Theory\, Durham Teams
URL:https://conference.ippp.dur.ac.uk/event/937/contributions/5052/
END:VEVENT
END:VCALENDAR