The purpose of these tables is to maintain a schedule of scientific talks and discussions relevant to your program.

Go to current week.⬇

Week1
Time
Place*
Speaker
Title
Comments, Links,...
Mon Jan 16


Holiday
Martin Luther King, Jr. Day

Wed Jan 18
10:30am
SSR
Martin Heller
Strong coupling isotropization simplified

Thu Jan 19
10:30am
Aud
Marco Panero
The planar limit of strongly coupled gauge theories in 3+1 and in 2+1 dimensions

Fri Jan 20
11:00am
2:00pm
2514
2514
moderator: Ed Shuryak
moderator: Hans Bantilan
Discussion: QCD with many flavors Nf
Discussion: on Finding a Gravity Description of Heavy Ion Collisions

Week 2
Time
Place*
Speaker
Title
Comments, Links,...
Mon Jan 23
12:15pm
Aud
Vladimir Falko
Overview of the Physics of Graphene program
Blackboard Lunch Seminar, All welcome.

2:30pm
SSR
coordinators et al.
Organizational Meeting
All interested are welcome.
Tue Jan 24
10:30am
SSR
moderators: David Berenstein, Larry Yaffe
Discussion: why are we here? Open problems and what we would like to know and calculate

Tue Jan 24
12:30 pm
Broida 3302
Nabil Iqbal
Luttinger's theorem, superfluid vortices and holography
High energy and gravity seminars. Might be of interest.
Wed Jan 25
10:30 am
SSR
Romuald Janik
Thermalization of boost invariant plasma, AdS/CFT and numerical relativity

Thu
Jan 26
10:30 am
Aud
Paul Chesler
The challenge of numerical relativity in asymptotically AdS spacetime

Fri Jan 27
11:00
am
Aud
Daniel Nogradi
Introduction by George Fleming
An ideal toy model for confining, walking and conformal gauge theories


2:00 pm
Aud
So Matsuura
Hybrid discretization of 4D N=4 SYM

Week 3
Time
Place*
Speaker
Title
Comments, Links,...
Mon Jan 30
10:00am
Aud
Philippe de Forcrand
Simulating lattice QCD at finite baryon density


12:15
Aud
Toby Wiseman
An overview of the `Numerical methods in QFT and gravity' program
Blackboard Lunch Seminar, All welcome.

2:00pm
Aud
Herbert Neuberger
Non-analyticity in scale in the planar limit of QCD

Tue Jan 31
10:00am
Aud
Frans Pretorius
A new numerical approach to evolution of 5D asymptotically AdS spacetimes


2:00pm
Aud
David Garfinkle
Novel(?) numerical methods for AdS gravitational collapse

Wed Feb 1
10:00am
Aud
Simon Catterall
Twisted lattice supersymmetry: a status report


2:00pm
Aud
Asato Tsuchiya
Expanding (3+1)-dimensional universe from a matrix model for superstrings

Thu Feb 2
10:00am
Aud
Paul Chesler
Dynamical Hawking radiation and holographic thermalization


2:00pm
Aud
Liza Huijse
The power of supersymmetry in a lattice model for strongly interacting fermions

Fri Feb 3
10:00am
Aud
Mithat Unsal
Gauge dynamics and new instanton, bion and renormalon effects


12:00pm
2514
moderator: Hans Bantilan
Discussion: strengths/weaknesses of current approaches on the lattice and gravity


2:00pm
Aud
Gary Horowitz
Instability of anti-de Sitter Spacetime

Week 4
Time
Place*
Speaker
Title
Comments, Links
Mon Feb 6
10:30 am
Aud
Jun Nishimura
Discussion: (related to Tsuchiya's talk last week)
(3+1)d spacetime from matrix models

Tues Feb 7
10:30 am
Aud
Edward Shuryak
Sounds of the Little Bang thermalization and jet quenching

Wed Feb 8
10:30 am
Aud
Hajime Aoki
How Standard Model can appear from the matrix model

Thurs Feb 9
10:30 am
Aud
Anna Hasenfratz
Strongly coupled conformal systems with fundamental fermions

Fri Feb 10
10:30 am
Aud
Joshua Cooperman
Quantizing Horava-Lifshitz Gravity via
Causal Dynamical Triangulations

Week 5
Time
Place*
Speaker
Title
Comments, Links
Tue
Feb 14
2:00 pm
Aud
Jacek Wosiek
On analytic solutions of multi-parton 't Hooft equations of two dimensional gauge theories

Wed Feb 15
10:30 am
Aud
Mike Teper
On the effective string theory of confining flux tubes

Thurs
Feb 16
10:30
am
Aud
Moderators: Piotr Bizon, Frans Pretorius
Discussion: Gravity in AdS.

Fri Feb 17
10:30 am
Aud
Masanori Hanada
Comparing the black hole thermodynamics with numerical data from super Yang-Mills simulation

Week 6
Time
Place*
Speaker
Title
Comments, Links
Tue Feb 21
12:30
Broida 3302
Jorge Santos
Hairy Black Holes and Solitons in Global AdS_5
HET and gravity seminar. Might be of interest
Tue Feb 21
2:00 pm
Aud
Michael Buchoff
Strongly coupled signatures through WW scattering

Wed Feb 22
10:30 am
SSR
Richard Brower
All you wanted to ask but was afraid to ask about the future of Lattice Gauge Theory Technology
Somewhere between a talk and a discussion.
Thu Feb 23
10:30 am
Aud
Oleg Andreev
Heavy Quark Potentials in QCD and Strings in Higher Dimensions

Week 7
Time
Place*
Speaker
Title
Comments, Links
Tue Feb 28
10:30
Aud
Pau Figueras
Braneworld black holes and the gravity dual of N=4 SYM on Schwarzschild

Wed Feb 29
10:30
SSR
Moderator: Carsten Gundlach
Discussion on basics of numerical gravity

Thu Mar 1
10:30
Aud
Ibrahima Bah
4D N=1 SCFT's from M5 branes
High Energy Theory and Gravity seminar:
Thu Mar 1
2:00 pm
SSR
Joao Penedones
  • Conformal Regge Theory
Change of schedule so that various locals can attend
Fri Mar 2
10:30
Aud
Volker Braun
Geometry of the Compact Directions: A Numerical Approach to Sasaki-Einstein and Calabi-Yau metrics.

Week 8
Time
Place*
Speaker
Title
Comments, Links
Tue Mar 6
10:30
Aud
David Berenstein
Real time dynamics in a holographic matrix model

Wed Mar 7
10:30
SSR
Tom Appelquist


Thu Mar 8
10:30
Aud
Issaku Kanamori
Lattice simulation of supersymmetric systems and spontaneous SUSY breaking

*Aud=Auditorium, SSR=Small Seminar Room, MSR=Main Seminar Room, FR=Founders' Room, PL=Porthole Lounge




Abstracts for focus week:


Philippe de Forcrand (ETH Zurich, CERN, YITP)

Simulating lattice QCD at finite baryon density

At non-zero baryon density, simulations of lattice QCD face a "sign problem" which prevents significant progress. In particular, the phase diagram of QCD as a function of temperature and chemical potential remains largely unknown. I recall the nature of the sign problem, the approaches used to circumvent it at small density, and point to a possible direction for progress.


Herbert Neuberger (Rutgers)
Non-analyticity in scale in the planar limit of QCD

Using methods of numerical Lattice Gauge Theory we show that in the limit of a large number of colors, properly regularized Wilson loops have an eigenvalue distribution which changes non-analytically as the overall size of the loop is increased. This establishes a large-$N$ phase transition in continuum planar gauge theory, a fact whose precise implications remain to be worked out.


Frans Pretorius (Princeton)
A new numerical approach to evolution of 5D asymptotically AdS spacetimes

I will describe a new numerical effort to solve Einstein gravity in 5-dimensional asymptotically Anti de Sitter spacetimes. The motivation is the gauge/gravity duality of string theory, with eventual application to scenarios (for example heavy ion collisions) that on the gravity side are described by dynamical, strong-field solutions. As a first step towards modeling such phenomena, we initially focus on spacetimes with SO(3) symmetry in the bulk; i.e., axisymmetric gravity, dual to plasma dynamics on the boundary with spherical or special conformal symmetry. As a test application we explore quasi-normal ringdown of highly deformed black holes in the bulk, and examine the degree to which the expectation value of the dual boundary stress tensor agrees with that of a conformal fluid.


David Garfinkle (Oakland)
Novel(?) numerical methods for AdS gravitational collapse

It is to be expected that new numerical methods will be needed to do simulations of gravitational collapse in 5 dimensions and with AdS boundary conditions. Nonetheless, it is helpful to see how far we can get using the sort of methods that have worked for GR in 4 dimensions. This talk will presents results for spherically symmetric gravitational collapse of a scalar field in AdS 5 in both global and Poincare coordinates.


Simon Catterall (Syracuse)
Twisted lattice supersymmetry: a status report

I will briefly review the construction of lattice Yang Mills theories which exhibit invariance under one or more twisted supersymmetries at non zero lattice spacing focusing in particular on a lattice model which targets N=4 YM in the naive continuum limit. I will show that the structure of the lattice model is remarkably similar to its continuum counterpart; the moduli space is not lifted to all orders in perturbation theory and the one loop beta function vanishes. I will then describe how the model may be simulated using standard Monte Carlo techniques borrowed from lattice QCD and hence how lattice studies can be used to probe the non perturbative structure of the theory and test aspects of the AdS/CFT correspondence.


Asato Tsuchiya (Shizuoka)
Expanding (3+1)-dimensional universe from a matrix model for superstrings

We reconsider the matrix model formulation of type IIB superstring theory in (9+1)-dimensional space-time. Unlike the previous works in which the Wick rotation was used to make the model well-defined, we regularize
the Lorentzian model by introducing infrared cutoffs in both the spatial and temporal directions. Monte Carlo studies reveal that the two cutoffs can be removed in the large-N limit and that the theory thus obtained has no parameters
other than one scale parameter. Moreover, we find that three out of nine spatial directions start to expand at some "critical time", after which the space has SO(3) symmetry instead of SO(9).


Paul Chesler (MIT)
Dynamical Hawking radiation and holographic thermalization

Holography provides a powerful tool to study non-equilibrium dynamics in strongly coupled quantum field theories, mapping challenging D dimensional quantum dynamics on to semi-classical gravity in D+1 dimensions. One interesting quantum field theory process to study is the creation and thermalization of a D = 4 strongly coupled quark-gluon plasma. Heavy ion collisions at RHIC and the LHC suggest that quark-gluon plasma can be created and thermalize in a time as short as 1 fm/c, the time it takes for light to traverse the diameter of a proton. Understanding the dynamics responsible for such rapid thermalization is a challenge using traditional perturbative field theory. Via holography, the creation of a quark-gluon plasma maps into the process of gravitational collapse and black brane formation. The thermalization of the quark-gluon plasma maps into the relaxation of the black brane geometry and thermalization of its Hawking radiation. I will describe new techniques for studying holographic thermalization and present results for thermalization times and mechanisms.


Liza Huijse (Harvard)
The power of supersymmetry in a lattice model for strongly interacting fermions

We consider a class of models for strongly interacting fermions that possesses supersymmetry. The benefit of incorporating this property turns out to be twofold. First, the supersymmetry leads to a considerable degree of analytic control, allowing the rigorous derivation of quite a few results, in particular on quantum ground states. Second, it induces a subtle interplay between kinetic and potential terms, which gives rise to various interesting features, such as quantum criticality and superfrustration, characterized by an extensive ground state entropy. In this talk, I will give an overview of the main results for this system, while discussing the key techniques that are available due to supersymmetry.


Mithat Unsal (Stanford)
Gauge dynamics and new instanton, bion and renormalon effects

I discuss the dynamics of four dimensional gauge theories with adjoint fermions for general gauge groups, both in perturbation theory and non-perturbatively, by using circle compactification with periodic boundary conditions for the fermions. There are new gauge phenomena, and new instanton effects. I will describe whether we can actually make sense of gauge theory in continuum. In compactified theory, I will give evidence that the elusive IR renormalons (for which no semi-classical configuration is known) of 't Hooft may have a semi-classical incarnation.
This is a molecule that Argyres and I refer to as "neutral bion". It carries zero topological charge and zero magnetic charge, and it corresponds to a pole in the Borel plane much closer to origin (by a factor of N) than the 4d instanton-anti-instanton pole. We recently derived this class of molecules by generalizing an old work of Bogomolny and Zinn-Justin from quantum mechanics to quantum field theory. I suspect we may have a chance to understand this theory in continuum.


Gary Horowitz (UCSB)
Instability of anti-de Sitter Spacetime

I will describe recent evidence that anti-de Sitter spacetime is nonlinearly unstable. Generic small but finite perturbations eventually form small black holes. There are special solutions, called geons, which remain nonsingular and do not collapse. I will also describe (weaker) evidence that black holes in anti-de Sitter spacetime are also unstable. The endstate may involve a violation of cosmic censorship. It would be of great interest to check all of these claims using numerical relativity.



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