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BEGIN:VEVENT
SUMMARY:The Holographic Swampland
DTSTART;VALUE=DATE-TIME:20201216T153000Z
DTEND;VALUE=DATE-TIME:20201216T160000Z
DTSTAMP;VALUE=DATE-TIME:20211023T014751Z
UID:indico-contribution-1195-5021@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:Color/ Kinematics Duality in AdS$_4$
DTSTART;VALUE=DATE-TIME:20201216T160000Z
DTEND;VALUE=DATE-TIME:20201216T163000Z
DTSTAMP;VALUE=DATE-TIME:20211023T014751Z
UID:indico-contribution-1195-5053@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:The Boostless Bootstrap: Amplitudes without Lorentz boosts
DTSTART;VALUE=DATE-TIME:20201216T143000Z
DTEND;VALUE=DATE-TIME:20201216T150000Z
DTSTAMP;VALUE=DATE-TIME:20211023T014751Z
UID:indico-contribution-1195-5028@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:20211023T014751Z
UID:indico-contribution-1195-5008@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:20211023T014751Z
UID:indico-contribution-1195-5016@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:20211023T014751Z
UID:indico-contribution-1195-5010@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:20211023T014751Z
UID:indico-contribution-1195-5046@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:20211023T014751Z
UID:indico-contribution-1195-5040@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:20211023T014751Z
UID:indico-contribution-1195-5042@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:M2- and D3-branes wrapped on a spindle
DTSTART;VALUE=DATE-TIME:20201215T160000Z
DTEND;VALUE=DATE-TIME:20201215T163000Z
DTSTAMP;VALUE=DATE-TIME:20211023T014751Z
UID:indico-contribution-1195-5043@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:20211023T014751Z
UID:indico-contribution-1195-5017@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:20211023T014751Z
UID:indico-contribution-1195-5033@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:20211023T014751Z
UID:indico-contribution-1195-5038@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
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