# Events Archive

## High Energy Theory Seminar

### High Energy Theory - "Supersymmmetric Lifshitz Field Theories", Avia Raviv-Moshe - Tel-Aviv

Mon, Oct 7, 2019, 2:30 pm

Abstract: Lifshitz scaling is an anisotropic scaling where time and space scale differently. Quantum field theories that exhibit Lifshitz scale symmetry provide a framework for studying low energy systems with an emergent dynamic scaling such as quantum critical points.

Audience: A free lecture open to the public.
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### HET Seminar | Jorge Santos, Cambridge | “Hawking Radiation at Strong Coupling: A Case for Braneworld Black Holes” | Bloomberg Hall Physics Library

Wed, Oct 2, 2019, 1:45 pm

Gauge/gravity duality relates certain strongly coupled CFTs with large effective central charge to semi-classical gravitational theories with AdS asymptotics. I will describe recent progress in understanding gravity duals for CFTs on non-trivial spacetimes with black hole horizons.

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### High Energy Theory - "Probing nonperturbative structures in gravity with SYK model" Mikhail Khramtsov - Steklov Institute | Jadwin A06

Tue, Oct 1, 2019, 2:00 pm

My talk is devoted to studies of large N saddle point structures in the SYK model beyond the commonly used approximations, in particular the replica-diagonal assumption and the conformal limit. We will discuss new solutions of the saddle point equations in the SYK and their role in physics of the model and in the gravity dual description.

Audience: A free lecture open to the public.
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### HET Seminar - Andrew Turner - Massachusetts Institute of Technology

Mon, Sep 30, 2019, 2:30 pm
Audience: A free lecture open to the public.
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### HET Seminar | Sebastian Mizera, IAS | “Aspects of Scattering Amplitudes and Moduli Space Localization” | Bloomberg Lecture Hall

Fri, Sep 27, 2019, 1:45 pm

We review a recent geometric formulation of the tree-level S-matrix of various quantum field theories, including gauge and gravity theories, in terms of intersection numbers of twisted cohomology groups on the moduli space of genus-zero curves with marked points.

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### Physics Group Meeting | Joonho Kim, IAS | "Cardy Formula and AdS Black Holes” | Bloomberg Hall Physics Library

Wed, Sep 25, 2019, 1:45 pm

I will discuss recent progress about the Cardy-like asymptotics of 4d supersymmetric index on S^3, also known as superconformal index. The main observation is that Bose-Fermi cancellation that trivializes the asymptotic expression of the index can be obstructed by complexifying chemical potentials.

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### High Energy Theory - “Walking, weakly first order phase transitions and complex CFTs” - Bernardo Zan - Princeton

Mon, Sep 23, 2019, 2:30 pm

I will discuss walking behavior in gauge theories and weakly first order phase transition in statistical models. Despite being phenomena appearing in very different physical systems, they both show a region of approximate scale invariance. They can be understood as a RG flow passing between two fixed points living at complex couplings, which we...

Audience: A free lecture open to the public.
Speaker(s):

### High Energy Theory - The non-local non-linear sigma model - Christian Jepsen - Princeton

Fri, Sep 20, 2019, 1:45 pm

In this talk, based on work with S. Gubser, Z. Ji, B. Trundy, and A. Yarom, I present a scalar theory described by an action given in terms of a bi-local integral of a power law factor, with an exponent parameter s, multiplied by the squared arc length between points on the target manifold.

Audience: Open to public
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### HET Seminar | Natalia Pinzani-Fokeeva, KU Leuven | "Holographic Schwinger-Keldysh effective field theories"

Tue, May 28, 2019, 2:00 pm

Hydrodynamics has been recently reformulated as an effective field theory based on an underlying Schwinger-Keldysh partition function.

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### HET Seminar | Joseph Maciejko, University of Alberta | "Disordered and deconfined: exotic quantum criticality with Dirac fermions"

Mon, May 6, 2019, 2:30 pm

Critical points of classical second-order phase transitions are thermodynamic phenomena of particular interest, driven by thermal fluctuations and characterized by emergent scale invariance and universal power-law correlations.

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### HET Seminar | Nathan Benjamin, Princeton University | "A New Twist on the Modular Bootstrap"

Mon, Apr 22, 2019, 2:30 pm

I will discuss new universal bounds on the spectra of two-dimensional unitary, compact conformal field theories coming from the modular bootstrap.

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### HET Seminar | Fridrik Gautason, KU Leuven | "The Three Twists of N = 4, The Omega Deformation and Holography"

Mon, Apr 8, 2019, 2:30 pm

I will start by reviewing the three inequivalent topological twists of N = 4 SYM on arbitrary four-manifolds and briefly discuss the resulting topological QFTs. I will emphasise the role played by global anomalies of N = 4 in our story and the relation to anomalies in the TQFTs.

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### HET Seminar | Minjae Cho, Harvard University | "Strings in Ramond-Ramond (RR) Backgrounds from the Neveu-Schwarz-Ramond (NSR) Formalism"

Tue, Apr 2, 2019, 3:00 pm

** Please note special time and location **

Speaker(s):

### HET Seminar | Xinan Zhou, Princeton | "AdS_3\times S^3\times K3 four-point functions and hidden symmetry"

Fri, Mar 29, 2019, 1:45 pm

In this talk we revisit the holographic calculation of 1/2-BPS four-point functions from IIB supergravity compactified on AdS_3\times S^3\times K3. I will present evidence that the four-point functions exhibit a hidden 6d conformal symmetry. Using this hidden symmetry, we conjecture a general formula for all 1/2-BPS four-point functions of...

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### HET Seminar | Scott Collier, Harvard University | "Virasoro analytic bootstrap and the bound-state spectrum of 3D quantum gravity"

Mon, Mar 25, 2019, 3:00 pm

* Please note special time and location *

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### HET Seminar | Anatoly Dymarsky, University of Kentucky | "Generalized Eigenstate Thermalization in 2d CFTs”

Mon, Mar 11, 2019, 2:30 pm

Infinite-dimensional conformal symmetry in two dimensions equips 2d CFTs with an integrable structure - an infinite tower of quantum KdV charges in involution.

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### HET Seminar | Zohar Komargodski, Stony Brook University | "Baryons as Quantum Hall Droplets"

Fri, Mar 1, 2019, 1:45 pm

We revisit the problem of baryons in the large N limit of Quantum Chromodynamics. A special case in which the theory of Skyrmions is inapplicable is one-flavor QCD, where there are no light pions to construct the baryon from. More generally, the description of baryons made out of predominantly one flavor within the Skyrmion model is...

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### HET Seminar | Matthijs Hogervorst, Perimeter Institute | "Hamiltonian truncation and the S^3 partition function"

Mon, Feb 18, 2019, 2:30 pm

In this talk I discuss Hamiltonian truncation, a toolkit to construct quantum field theories. Hamiltonian truncation is in many ways orthogonal to the more familiar lattice regularization, and it can be used to systematically compute QFT observables with little computational effort.

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### HET Seminar | Gabor Sarosi, UPenn & University of Brussels | "Boundary dual of the bulk symplectic form and the volume of maximal slices" | PCTS Seminar Room

Mon, Nov 19, 2018, 2:30 pm

In this talk, I will explain how to understand the symplectic structure of the gravitational phase space in AdS in terms of the quantum overlap in the holographically dual CFT. As an application, I will use this to study the boundary description of the volume of maximal Cauchy slices.

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### HET Seminar | Kiryl Pakrouski, Princeton University | "Spectrum of Majorana Quantum Mechanics with $O(4)^3$ Symmetry" | PCTS Seminar Room

Fri, Nov 9, 2018, 1:45 pm

We study the quantum mechanics of 3-index Majorana fermions $\psi^{abc}$ governed by a quartic Hamiltonian with $O(N)^3$ symmetry.

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