BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Higher Order QCD Calculations with NNLOJET
DTSTART;VALUE=DATE-TIME:20181220T110000Z
DTEND;VALUE=DATE-TIME:20181220T112000Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4298@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Duncan Walker (IPPP\, Durham University)\nI will pre
sent some recent results of higher order QCD calculations in vector boson
processes at colliders using the Monte Carlo framework NNLOJET. Recent dev
elopments are opening up a new world of precision phenomenology for study\
, improving our understanding of QCD/EW interactions at a fundamental leve
l.\n\nhttps://conference.ippp.dur.ac.uk/event/748/contributions/4298/
LOCATION:Department of Mathematical Sciences CM101
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4298/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bifurcations in the RG-Flow of QCD
DTSTART;VALUE=DATE-TIME:20181219T164500Z
DTEND;VALUE=DATE-TIME:20181219T170500Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4306@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Folkert Kuipers ()\nIn this talk\, I’ll discuss th
e connection between the theory of dynamical systems and renormalization g
roup flows in quantum field theory. In particular\, I’ll apply numerical
methods from bifurcation analysis to study the RG-flow of an effective mo
del for QCD with a four-fermi interaction and an arbitrary number of color
s and massless flavors. Using bifurcation analysis techniques\, new fixed
points are found in and close to the conformal window. Particular focus wi
ll be given to the way in which the fixed points (dis)appear in the model\
, and how this affects the scaling dimensions of the (ir)relevant operator
s. Furthermore\, I’ll discuss how the fixed point structure of the RG-fl
ow changes when a scalar field coupling through a Yukawa interaction is ad
ded to the model.\n\nhttps://conference.ippp.dur.ac.uk/event/748/contribut
ions/4306/
LOCATION:Department of Mathematical Sciences CM101
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4306/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-perturbative aspects of Sp(2N) gauge theories.
DTSTART;VALUE=DATE-TIME:20181220T115000Z
DTEND;VALUE=DATE-TIME:20181220T121000Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4300@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jack Holligan (Swansea University)\nThe discovery in
2012 of the Higgs boson provided evidence for our understanding of the or
igin of mass. However there still remain some unanswered questions one of
which is the "Naturalness Problem".\n\nLike the other fundamental particle
s\, the Higgs acquires loop corrections to its mass due to its interaction
with the quarks\, the leptons and itself. If we impose an ultraviolet cut
off\, $\\Lambda_{\\text{UV}}$\, on the Standard Model\, these corrections
depend quadratically on $\\Lambda_{\\text{UV}}$. If $\\Lambda_{\\text{UV}}
$ is sent to infinity\, a very large counter term is required to cancel ou
t the quadratic divergence arising from the loop corrections. In order to
produce the small observed Higgs mass of $125$ GeV\, the counter term must
be computed to a precision so high that it is not only unnatural - hence
the name - but far beyond experimental reach.\n\nOne way to resolve this p
roblem is to treat the Higgs not as a fundamental particle but as a consti
tuent one (like the proton or neutron). The need for fine-tuning is simply
an effect of the approximation of the Higgs as a fundamental particle bre
aking down.\n\nThe compositeness deals with the issue of fine tuning and t
he subsequent low mass is achieved by corollary of Goldstone's Theorem. Wh
en a symmetry is explicitly broken (e.g. by a mass term) there exists a li
ght boson for each broken generator (as opposed to a massless boson in the
case of spontaneous symmetry breaking). The explicit breaking of a new sy
mmetry group could give rise to what is observed as the Higgs boson.\n\nTh
e combination of Goldstone's Theorem and a new symmetry group have potenti
al to explain the low-mass Higgs as a composite particle without the need
for fine-tuning. Candidate symmetries are the Symplectic Groups (denoted a
s Sp($2N$)). Observable quantities of such a Quantum Field can be computed
on the lattice and their experimental detection would provide evidence fo
r same.\n\nhttps://conference.ippp.dur.ac.uk/event/748/contributions/4300/
LOCATION:Department of Mathematical Sciences CM101
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4300/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Isospin breaking corrections to leptonic decay rates on the lattic
e
DTSTART;VALUE=DATE-TIME:20181220T121500Z
DTEND;VALUE=DATE-TIME:20181220T123500Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4301@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: James Richings (stfc southampton phd student and for
mer durham undergraduate student)\nLattice QFT is a method for calculating
non-perturbative physics and has been used extensively to calculate prope
rties of low energy QCD. Over the last decade calculation's of a number of
non-perturbative QCD quantities have reached a good precision\, with agre
ement from across the lattice community.\nIn general isospin breaking (IB)
effects have not been included in these calculations because until now IB
effects have not been a limiting source of systematic error. Isospin brea
king effects enter in two ways\, the difference in the mass of the up and
down quark (strong IB) and the difference in the QED charge of up and down
type quarks (QED IB). Considering power counting these effects are expect
ed to be of the order 1% of the decay rate. Due to the introduction of QED
effects\, we must calculate the full QCD + QED path integral on the latti
ce and this introduces a number of complications. \nIn this presentation\,
I will introduce Lattice QCD+QED as a calculation method for flavour phys
ics observables and discuss how leptonic decay rates are calculated on the
lattice with the inclusion of isospin breaking effects.\n\nhttps://confer
ence.ippp.dur.ac.uk/event/748/contributions/4301/
LOCATION:Department of Mathematical Sciences CM101
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4301/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Applications of gauge/gravity duality
DTSTART;VALUE=DATE-TIME:20181219T144000Z
DTEND;VALUE=DATE-TIME:20181219T150000Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4302@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Matthew Russell (Southampton)\nThis talk will discus
s scenarios where the gauge/gravity duality can be applied to non-perturba
tive regimes in physics. The standard model explains many phenomena seen i
n nature but relies on techniques that only work in small coupling. The ga
uge/gravity duality is a way in which we can try to obtain theoretical pre
dictions for areas such as strongly coupled condensed matter and the low e
nergy regime of QCD. Specifically this talk will focus on momentum dissipa
tion effects on zero sound in strange metals and the benefit of exploring
holographic imaginary chemical potential in the QCD phase diagram.\n\nhttp
s://conference.ippp.dur.ac.uk/event/748/contributions/4302/
LOCATION:Department of Mathematical Sciences CM107
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4302/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Central charge of self-dual strings from holography
DTSTART;VALUE=DATE-TIME:20181219T153000Z
DTEND;VALUE=DATE-TIME:20181219T155000Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4304@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ronnie Rodgers (University of Southampton)\nM-theory
is a candidate for a theory of quantum gravity. Its fundamental objects a
re called M2-branes and M5-branes. The low-energy theory describing coinci
dent M5-branes is poorly understood in many respects\, with holography pro
viding one of the most useful tools to further that understanding. It is k
nown that the theory should possess solitonic solutions called "self-dual
strings". I will review the holographic description of these strings\, and
show how calculation of entanglement entropy provides a way of calculatin
g an important quantity characterising them: their central charge.\n\nhttp
s://conference.ippp.dur.ac.uk/event/748/contributions/4304/
LOCATION:Department of Mathematical Sciences CM107
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4304/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The orientifold quotient of giant gravitons
DTSTART;VALUE=DATE-TIME:20181219T155500Z
DTEND;VALUE=DATE-TIME:20181219T161500Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4305@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Christopher Lewis-Brown (Queen Mary University of Lo
ndon)\nThe AdS/CFT correspondence links type IIB string theory on $AdS_5 \
\times S^5$ to $\\mathcal{N}=4$ super Yang-Mills with gauge group $U(N)$.
In 1998\, Witten showed that taking an orientifold quotient of the $S^5$
factor - identifying anti-podal points so as to replace $S^5$ with $\\math
bb{RP}^5$ - can be understood on the gauge theory side by replacing the $U
(N)$ gauge group with either $SO(N)$ or $Sp(N)$. I will talk about this qu
otient from the gauge theory point of view\, focusing on the half-BPS sect
or. This corresponds to taking the quotient of rotating D3-brane states\,
also called giant gravitons. The mathematics of this quotient leads to sur
prising connections with plethysms and domino tableaux\, which can be tied
back to intuitive notions of how the orientifold acts on the branes.\n\nh
ttps://conference.ippp.dur.ac.uk/event/748/contributions/4305/
LOCATION:Department of Mathematical Sciences CM107
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4305/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renormalization Group Properties of the Conformal Mode
DTSTART;VALUE=DATE-TIME:20181219T173500Z
DTEND;VALUE=DATE-TIME:20181219T175500Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4308@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Matthew Kellett (University of Southampton)\nThe ren
ormalization group properties of a QFT are of profound importance to the t
heory. In quantum gravity\, one runs into the problem that the kinetic ter
m for the dilaton (or conformal mode) has the wrong sign\, causing the Euc
lidean partition function to be (worse than usually) ill-defined. Imposing
a new quantization condition allows us to not only make sense of this\, b
ut also potentially would allow us to use standard RG techniques to quanti
ze gravity. We see that the effect of resolving this conformal mode "insta
bility" (as described by Hawking et. al.) is to constrain the size of the
manifold by its homogeneity. I will present an outline of how this is done
and some results from studies of the torus. If time permits\, I will also
outline ongoing and future work in this area.\n\nhttps://conference.ippp.
dur.ac.uk/event/748/contributions/4308/
LOCATION:Department of Mathematical Sciences CM101
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4308/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heterotic M2-Branes
DTSTART;VALUE=DATE-TIME:20181219T171000Z
DTEND;VALUE=DATE-TIME:20181219T173000Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4310@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Rishi Mouland (King’s College London)\nM-Theory ha
s been conjectured as a single theory in which we can find each of the var
ious superstring theories\, and as such provides a UV completion of 11d su
pergravity. Instead of strings\, we have M2-branes and M5-branes. The clas
sic Horava-Witten result says that a compactification of M-theory on $S^1/
\\mathbb{Z}_2$ retrieves the $E_8\\times E_8$ heterotic theory\, with the
wrapped M2-brane as the "fundamental" string. In this work\, we reproduce
this result from the perspective of the ABJM theory\, a world volume theor
y conjectured to capture the low-energy behaviour of multiple M2-branes. I
n particular\, we find that the subtle nature of Chern-Simons matter theor
ies delivers a new perspective on the GSO projection and the non-supersymm
etric $SO(16)\\times SO(16)$ heterotic theory.\n\nhttps://conference.ippp.
dur.ac.uk/event/748/contributions/4310/
LOCATION:Department of Mathematical Sciences CM107
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4310/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Clustering algorithms for b-jets from BSM Higgs Bosons.
DTSTART;VALUE=DATE-TIME:20181220T090000Z
DTEND;VALUE=DATE-TIME:20181220T092000Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4312@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Billy Ford (University of Southampton)\nIt is long e
stablished that the Standard Model is not a complete theory of nature and
at the LHC we hope to see hints of some new physics beyond our current und
erstanding. This project seeks to improve current techniques of jet cluste
ring\, in particular from some extended BSM Higgs sector\, such as those i
n 2 Higgs Doublet Models\, which include additional particles alongside th
e 125 GeV SM Higgs detected in 2012.\n\nhttps://conference.ippp.dur.ac.uk/
event/748/contributions/4312/
LOCATION:Department of Mathematical Sciences CM101
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4312/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards a classification of supersymmetric spacetimes
DTSTART;VALUE=DATE-TIME:20181220T101500Z
DTEND;VALUE=DATE-TIME:20181220T103500Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4319@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Ross Grassie ()\nIn this talk\, we present a deforma
tion theoretic approach to classifying supersymmetric spacetimes. \n\nIt
is a postulate of general relativity that spacetime is described by a four
-dimensional Lorentzian manifold. However\, it is not always convenient t
o use this description. For example\, it may be easier to take the Newton
ian limit and work with theories at lower energies. These non-relativisti
c spacetimes are still useful descriptions and should be incorporated in o
ur classification. \n\nTo this end\, we notice that the above postulate h
as an important consequence: the spacetime manifold is fully described by
its relativity group. Therefore\, we do not ask for manifolds whose relat
ivity group is the Poincaré group\, but for geometries with some relativi
ty group. We will show that these groups may be described by kinematical
Lie algebras and give the classification of these algebras. We then show
how this programme is being extended to the supersymmetric case.\n\nhttps:
//conference.ippp.dur.ac.uk/event/748/contributions/4319/
LOCATION:Department of Mathematical Sciences CM107
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4319/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Supergravity on a 3-Torus: Quantum Linearisation Instabilities wit
h a Supergroup
DTSTART;VALUE=DATE-TIME:20181219T173500Z
DTEND;VALUE=DATE-TIME:20181219T175500Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4311@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Lasse Schmieding (University of York)\nFor closed un
iverses\, the Einstein equations (EE) are linearisation unstable. Perturbi
ng around any background with Killing symmetries the linearised EE admit s
olutions which are not themselves linearisations of solutions to the non-l
inear EE. To control these spurious solutions\, quadratic linearisation st
ability conditions are imposed. However\, in the quantum theory these stab
ility conditions require that all physical states must be invariant under
the background symmetries\, which can complicate the construction of the p
hysical Hilbert space. I will review linearisation stability conditions i
n both classical and quantum gravity\, and then discuss a simple supersymm
etric model to study quantum linearisation instabilities with a supergroup
.\n\nhttps://conference.ippp.dur.ac.uk/event/748/contributions/4311/
LOCATION:Department of Mathematical Sciences CM107
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4311/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Different aspects of single top quark and DM channel
DTSTART;VALUE=DATE-TIME:20181220T095000Z
DTEND;VALUE=DATE-TIME:20181220T101000Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4314@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Charanjit Kaur Khosa (University of Sussex)\nRecentl
y it has been pointed out that associated production of dark matter with s
ingle top quark could also provide an interesting reach for dark matter (D
M) searches at LHC. I will discuss this in context of simplified dark matt
er models and in two Higgs doublet model. The top quark produced via this
channel is polarized and the polarization depends on the CP of the mediato
r (simplified dark matter model with spin-0 mediators). I will also talk a
bout the top polarization sensitive angular observables\, which along with
the cross-section\, could be used to probe the CP property of the mediato
r.\n\nhttps://conference.ippp.dur.ac.uk/event/748/contributions/4314/
LOCATION:Department of Mathematical Sciences CM101
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4314/
END:VEVENT
BEGIN:VEVENT
SUMMARY:What do knots\, quantum computation and field theories have in com
mon?
DTSTART;VALUE=DATE-TIME:20181220T090000Z
DTEND;VALUE=DATE-TIME:20181220T092000Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4316@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Rajath Radhakrishnan (Queen Mary University of Londo
n)\nKnots are deceivingly simple mathematical objects. Showing whether two
knots are the same or not is a hard problem. While it can be done easily
by inspection for simple knots\, the problem becomes hard very quickly. Id
eally\, to distinguish between inequivalent knots we have to define knot i
nvariants. At first sight\, this may not have anything to do with quantum
computation or field theories. However\, it turns out that these subjects
are intimately related to each other through an algebraic object called a
modular tensor category (MTC). In this talk\, I will describe an MTC and e
xplain how it forms the bridge between the aforementioned topics.\n\nhttps
://conference.ippp.dur.ac.uk/event/748/contributions/4316/
LOCATION:Department of Mathematical Sciences CM107
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4316/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Gentle Introduction to Supersymmetric Localization
DTSTART;VALUE=DATE-TIME:20181220T092500Z
DTEND;VALUE=DATE-TIME:20181220T094500Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4317@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Matthew Renwick (Department of Mathematical Sciences
\, Durham University)\nLocalization is a powerful technique utilised in su
persymmetric field theories to reduce troublesome infinite dimensional pat
h integrals to pleasant finite dimensional integrals. The aim of this talk
is to provide an introduction to this topic and discuss its applications.
In particular\, I will explain how this technique is used to compute the
exact partition function and the expectation values for certain operators
in supersymmetric theories.\n\nhttps://conference.ippp.dur.ac.uk/event/748
/contributions/4317/
LOCATION:Department of Mathematical Sciences CM107
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4317/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Resurgence and Non-Perturbative Physics
DTSTART;VALUE=DATE-TIME:20181220T095000Z
DTEND;VALUE=DATE-TIME:20181220T101000Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4318@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Philip Glass (Durham University)\nDivergent perturba
tion series are prevalent in all of physics. Notable examples include sums
of Feynman diagrams in QFT and sums over Riemann surfaces in string scatt
ering. I will first give a brief introduction to Resurgence theory\, start
ing with ways of summing divergent series which will lead us to Borel summ
ation and then looking at the analytic continuation of the path integrals
which will lead us to Resurgence theory. Time permitting I will then discu
ss Resurgence in the context of $\\mathcal{N}=(2\,2)$ on the 2-sphere usin
g results from SUSY Localization.\n\nhttps://conference.ippp.dur.ac.uk/eve
nt/748/contributions/4318/
LOCATION:Department of Mathematical Sciences CM107
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4318/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Light charged Higgs boson with dominant cb decay from 3HDM and its
search at LHC and future colliders
DTSTART;VALUE=DATE-TIME:20181220T092500Z
DTEND;VALUE=DATE-TIME:20181220T094500Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4313@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Muyuan Song (University of Southampton)\nI am workin
g with Professor Stefano Moretti and Doctor Andrew Akeroyd on charged Higg
s phenomenology in the University of Southampton recently. We posted the p
aper in October 2018 on arXiv:1810.05403.\n\nThe possibility of a light ch
arged Higgs boson H± that decays predominantly to quarks (cs and/or cb) a
nd with a mass in the range 80 GeV ≤ mH± ≤ 90 GeV is studied in the c
ontext of Three- Higgs-Doublet Models (3HDMs). At present the Large Hadron
Collider (LHC) has little sensitivity to this scenario\, and currently th
e best constraints are from LEP2 and Tevatron searches. The branching rati
o of H± → cb can be dominant in two of the five types of 3HDM\, and we
determine the parameter space where this occurs. The decay H± → cb has
recently been searched for at the LHC for the first time\, and with increa
sed integrated luminosity one would expect sensitivity to the region 80 Ge
V ≤ mH± ≤ 90 GeV due to the smaller backgrounds with respect to H±
→ cs decays.\n\nhttps://conference.ippp.dur.ac.uk/event/748/contribution
s/4313/
LOCATION:Department of Mathematical Sciences CM101
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4313/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Non-Minimal Flavour Violation in the MSSM from a flavoured SU(5) G
UT
DTSTART;VALUE=DATE-TIME:20181220T101500Z
DTEND;VALUE=DATE-TIME:20181220T103500Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4315@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Sam Rowley (University of Southampton)\nWe study fla
vour-violation in a SU(5) setup inspired by flavoured GUTs. We investigate
the impact of various observables at low scales on the high-energy param
eters of the theory including mu->e gamma and the relic density of dark ma
tter. An interesting interplay between the quark and lepton sectors become
s apparent due to the cohabitation of various fields in representations of
the unifying group. Correlations between high scale parameters in the con
text of current experimental flavour data are shown to manifest. We show t
hat movement away from the Minimal Flavour Violation paradigm is perfectly
possible within the context of current limits.\n\nhttps://conference.ippp
.dur.ac.uk/event/748/contributions/4315/
LOCATION:Department of Mathematical Sciences CM101
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4315/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quasi-Degenerate Vacua in the KSVZ axion model\; A minimal approac
h to dark energy and dark matter
DTSTART;VALUE=DATE-TIME:20181219T144000Z
DTEND;VALUE=DATE-TIME:20181219T150000Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4320@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Amy Lloyd-Stubbs (Lancaster University)\nI will pres
ent a study of the KSVZ axion model with quasi-degenerate vacua as a minim
al model for dark energy and dark matter. I will review axions as dark mat
ter and provide an explanation for dark energy in the form of a difference
in vacuum energy density between the electroweak vacuum and a second dege
nerate minimum in the effective potential\, which can be achieved via the
scalar threshold effect.\n\nhttps://conference.ippp.dur.ac.uk/event/748/co
ntributions/4320/
LOCATION:Department of Mathematical Sciences CM101
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4320/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Production and thermalisation of isolated sectors
DTSTART;VALUE=DATE-TIME:20181219T150500Z
DTEND;VALUE=DATE-TIME:20181219T152500Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4321@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Hannah Tillim (University of Oxford)\nAn increasingl
y attractive alternative to the WIMP model is that of an `isolated' dark s
ector - i.e. one which interacts with the standard model only via gravity
and which therefore is unbounded by direct detection. We present a possibl
e production mechanism for this sector in the early Universe (Hawking emis
sion from primordial black holes) as well as predictions for the subsequen
t evolution and ultimate fate of initially highly non-equilibrium populati
ons.\n\nhttps://conference.ippp.dur.ac.uk/event/748/contributions/4321/
LOCATION:Department of Mathematical Sciences CM101
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4321/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quantum Gravity and the dilaton portal
DTSTART;VALUE=DATE-TIME:20181220T121500Z
DTEND;VALUE=DATE-TIME:20181220T123500Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4327@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Alex Mitchell-Lister (University of Southampton)\nIn
this brief talk I discuss two aspects of a novel approach to quantum grav
ity\, the first of these is the construction of evanescent operators of th
e dilaton which provides an initial direction to finding solutions to the
inherent problems of non-renormalizability of quantum gravity. The second
is the use of the Batalin-Vilkovisky anti-field technique and how this can
be used with cohomological techniques to restrict the terms in our action
. Following this\, and time permitting\, a brief review of present and fu
ture work will be discussed.\n\nhttps://conference.ippp.dur.ac.uk/event/74
8/contributions/4327/
LOCATION:Department of Mathematical Sciences CM107
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4327/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Semiclassical gravity in the far field of stars and black holes
DTSTART;VALUE=DATE-TIME:20181220T112500Z
DTEND;VALUE=DATE-TIME:20181220T114500Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4325@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jake Percival (University of Sheffield)\nIn semiclas
sical gravity\, the expectation value of the stress-energy operator $\\lef
t\\langle T_{\\mu\\nu}\\right\\rangle$ is an infinite quantity. To avoid
having to renormalize it\, one can calculate the difference in $\\left\\la
ngle T_{\\mu\\nu}\\right\\rangle$ between a pair of quantum states in suc
h a manner that the divergent parts cancel. However\, another technique ex
plored more recently is to take the difference in $\\left\\langle T_{\\mu\
\nu}\\right\\rangle$ between two different spacetimes\, while in the same
quantum state. I will summarize prior work on this method and detail how
we have applied it to calculate the difference $\\Delta\\left\\langle T_{\
\mu\\nu}\\right\\rangle$ between the spacetimes of a non-Newtonian star a
nd a Schwarzschild black hole.\n\nhttps://conference.ippp.dur.ac.uk/event/
748/contributions/4325/
LOCATION:Department of Mathematical Sciences CM107
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4325/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Coincident M5-branes and dual singular geometries
DTSTART;VALUE=DATE-TIME:20181219T150500Z
DTEND;VALUE=DATE-TIME:20181219T152500Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4337@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Callum Brodie (University of Oxford)\nThrough a web
of string dualities\, M5-brane configurations in M-theory can be mapped to
geometrical features. In particular\, I will discuss this map via heterot
ic/F-theory duality\, using a Horava-Witten description of heterotic $\\ma
thrm{E}_8 \\times \\mathrm{E}_8$ string theory as the connection to M-theo
ry. Intersecting or coincident M5-branes are mapped to singular base geome
tries in F-theory\, which also correspond to singular geometries in Type I
IB string theory. I will explain these dualities\, and if I have time I wi
ll discuss geometrical transitions corresponding to deforming M5-brane con
figurations and point out some cute connections with toric geometry.\n\nht
tps://conference.ippp.dur.ac.uk/event/748/contributions/4337/
LOCATION:Department of Mathematical Sciences CM107
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4337/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anisotropies in the stochastic gravitational-wave background
DTSTART;VALUE=DATE-TIME:20181219T155500Z
DTEND;VALUE=DATE-TIME:20181219T161500Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4323@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Alex Jenkins (King's College London)\nIn the new era
of gravitational-wave astronomy\, one of the most exciting targets for fu
ture observations is the stochastic gravitational-wave background (SGWB).
While we have yet to detect the SGWB\, we expect that by studying the angu
lar power spectrum of its anisotropies\, we may learn about the large-scal
e structure of the Universe (analogous to studies of the CMB). With this i
n mind\, we develop detailed models of the SGWB anisotropies from two impo
rtant sources of gravitational waves: unresolved compact binary coalescenc
es\, and cosmic strings.\n\nhttps://conference.ippp.dur.ac.uk/event/748/co
ntributions/4323/
LOCATION:Department of Mathematical Sciences CM101
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4323/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gravity amplitudes\, observables and classical scattering
DTSTART;VALUE=DATE-TIME:20181220T110000Z
DTEND;VALUE=DATE-TIME:20181220T112000Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4324@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Maybee Ben (University of Edinburgh)\nModern amplitu
des techniques offer the tantalising possibility of greatly simplifying th
eoretical predictions for precision gravitational wave astronomy. One exci
ting example is the double copy\, an enigmatically simple connection betwe
en Yang-Mills theory and gravity. In this talk I will discuss our recent w
ork on rigorously obtaining classical scattering observables from quantum
amplitudes\, and why the double copy makes this pertinent for gravitationa
l radiation.\n\nhttps://conference.ippp.dur.ac.uk/event/748/contributions/
4324/
LOCATION:Department of Mathematical Sciences CM107
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4324/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Renormalised vacuum polarisation on topological black holes
DTSTART;VALUE=DATE-TIME:20181220T115000Z
DTEND;VALUE=DATE-TIME:20181220T121000Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4326@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Thomas Morley (University of Sheffield)\nAnti-de Sit
ter spacetime is a solution of Einstein’s equations with a negative cosm
ological constant. This fact allows for unusual black hole solutions with
non-spherical horizon topology. We calculate the renormalised vacuum polar
isation for black holes with spherical\, flat and hyperbolic event horizon
s\, following the “extended coordinates” method\, which uses a mode-su
m representation for the Hadamard parametrix. Renormalisation counter term
s are subtracted from the Green’s function mode-by-mode\, leaving each i
ndividual term manifestly finite.\n\nhttps://conference.ippp.dur.ac.uk/eve
nt/748/contributions/4326/
LOCATION:Department of Mathematical Sciences CM107
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4326/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shedding Light on the Initial Conditions of Inflation with the Eis
enhart Lift
DTSTART;VALUE=DATE-TIME:20181219T153000Z
DTEND;VALUE=DATE-TIME:20181219T155000Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4322@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Kieran Finn (University of Manchester)\nThe Hot Big
Bang model of cosmology requires very finely-tuned initial conditions in o
rder to explain the degree of flatness and homogeneity we observe in the U
niverse today. This has led the community to embrace the theory of inflati
on\, since it readily explains these features. But are the initial conditi
ons required to initiate inflation more or less finely-tuned than those re
quired by the Hot Big Bang? Although there are several qualitative argumen
ts to suggest that inflation should happen generically\, attempts to quant
ify these have led to ambiguous answers due to the infinite measure of the
total phase space. Previous studies have regularised this measure to get
an unambiguous answer\, but the results are strongly dependent on the regu
larisation technique used with some authors concluding that inflation is e
xponentially likely while others conclude that it is exponentially unlikel
y.\n\nThe Eisenhart lift\, which was recently applied to field theories fo
r the first time\, is a technique that allows one to convert a theory desc
ribed by a Lagrangian into an equivalent geometric system. Applying the Ei
senhart lift to inflation\, one can construct a manifold such that each po
int represents a different initial condition. Both the total volume of thi
s manifold and the volume that leads to inflation is finite. Thus\, we can
finally answer quantitatively how finely-tuned the initial conditions of
inflation are without the need for a regulator.\n\nhttps://conference.ippp
.dur.ac.uk/event/748/contributions/4322/
LOCATION:Department of Mathematical Sciences CM101
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4322/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Global Fixed Points of Scalar and Fermionic Theories
DTSTART;VALUE=DATE-TIME:20181219T171000Z
DTEND;VALUE=DATE-TIME:20181219T173000Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4307@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Bradley Garland (University of Sussex)\nInteracting
fixed points in three dimensions have been investigated using modern renor
malisation group methods. Investigations focus on the seminal Wilson-Fishe
r fixed point solution in O(N) symmetric scalar theories and asymptoticall
y safe UV fixed points in fermionic Gross-Neveu models. The main novelty o
f the study is the use of Padé approximants. Padé approximants have been
used to extend local fixed point data that is obtained from polynomial ex
pansions and hence\, only valid for small field values to global fixed poi
nt solutions for all field values. For both the scalar and fermionic theor
ies this approach is tested in the Large N limit where explicit analytic f
ixed point solutions can be found. Particular emphasis is put on the large
real field and the large imaginary field limits\, and converging-limiting
singularities in the complex field plane. Finite N models have also been
tested for the O(N) symmetric scalar theories. Here exact solutions are no
t accessible and Padé approximants have been used to make predictions bey
ond the radius of convergence of polynomial expansions. Padé approximants
have also been used to locate singularities exhibited by the given comple
xified fixed point solutions. In doing this it is seen that the singularit
ies exhibited by Padé approximants themselves form patterns of defects in
the complexified field plane that are intimately linked to their ability
to converge to high accuracy.\n\nhttps://conference.ippp.dur.ac.uk/event/7
48/contributions/4307/
LOCATION:Department of Mathematical Sciences CM101
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4307/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fermionically Generated Superstrata
DTSTART;VALUE=DATE-TIME:20181219T164500Z
DTEND;VALUE=DATE-TIME:20181219T170500Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4309@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Nejc Ceplak (Queen Mary\, University of London)\nThe
aim of the talk is to present the construction of a new family of smooth
horizonless solutions of supergravity that have the same charges as the su
persymmetric D1-D5-P black hole. We will begin with a brief review of the
Fuzzball proposal for black holes\, which states that at the length scale
of the horizon a new\, fuzzy\, phase takes over\, allowing outside observe
rs to distinguish between different microstates of the black hole. We wil
l then focus on the three charge supersymmetric D1-D5-P black hole and re
view some of its microstate geometries. We then present a method of obtai
ning a new family of solutions using supersymmetry generators. The motiv
ation behind this construction is coming from the dual CFT multiplet struc
ture\, where these fermionic generators are used to create new linearly in
dependent states in the theory. On the gravity side the geometries dual to
these new states are generated by the Killing spinors of AdS$_3 \\times S
^3 \\times T^4$. Hence we present the explicit form of these spinors and u
se them to construct new solutions to the supergravity equations. Finally
we present these new solutions and show that they are simpler than the one
s previously known with having a fewer number of excited fields.\n\nhttps
://conference.ippp.dur.ac.uk/event/748/contributions/4309/
LOCATION:Department of Mathematical Sciences CM107
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4309/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Developing an amplitude level parton shower.
DTSTART;VALUE=DATE-TIME:20181220T112500Z
DTEND;VALUE=DATE-TIME:20181220T114500Z
DTSTAMP;VALUE=DATE-TIME:20210619T063550Z
UID:indico-contribution-748-4299@conference.ippp.dur.ac.uk
DESCRIPTION:Speakers: Jack Holguin (The University of Manchester)\nPerturb
ative QCD suffers from multitudes of large logarithms\, arising from the m
iscancellation of infra-red poles. These logarithms can cause enhancements
of high order terms and spoil perturbative convergence. Historically ther
e has been two disjoint approaches to solving this problem\; resummations
and parton showers. Nowadays resummations are performed at high accuracy a
nd are rigorously defined\, but they are very time consuming. Parton showe
rs are all purpose and can be implemented computationally. However modern
showers are still far from a rigorous definition. We present a new algorit
hm that aims to unify these two approaches.\n\nhttps://conference.ippp.dur
.ac.uk/event/748/contributions/4299/
LOCATION:Department of Mathematical Sciences CM101
URL:https://conference.ippp.dur.ac.uk/event/748/contributions/4299/
END:VEVENT
END:VCALENDAR