Events Archive

HET Seminar | Julien Barrat, Humboldt University of Berlin| “A dispersion relation for bootstrapping holographic defect correlators” | PCTS & Zoom
Tue, Nov 22, 2022, 2:00 pm2:00 pm

Tremendous progress has been achieved during the last years in bootstrapping conformal correlators at strong coupling using analytical bootstrap methods and the AdS/CFT correspondence. In particular, the development of Lorentzian inversion formulae revealed helpful in reconstructing four-point functions. In this talk I will present how this…

IAS HET Seminar | Sakura Schafer-Nameki, University of Oxford| “TBA” | Bloomberg Lecture Hall & Zoom
Mon, Nov 21, 2022, 2:30 pm2:30 pm
IAS HET Seminar | S. Josephine Suh, Member, School of Natural Sciences, IAS; Harvard University| “Spacetime and Gravity from Quantum Mechanics” | Bloomberg Lecture Hall & Zoom
Fri, Nov 18, 2022, 1:45 pm1:45 pm

Motivated by holographic duality and the Ryu-Takyanagi formula, we ask the question, “What quantum problem are Einstein’s equations solving?” Answering this question amounts to dissecting or “deconstructing” AdS/CFT to identify the quantum-mechanical origins of spacetime and gravity. We propose a solution involving a class of dynamical…

HET Seminar | Sabine Harribey, Nordita | “An application of melonic CFTs: The F-theorem” | PCTS & Zoom
Mon, Nov 14, 2022, 2:30 pm2:30 pm

Tensor models exhibit a melonic large-N limit. They were first introduced in zero dimension in the context of random geometry and quantum gravity. They were then generalized in d dimensions where they give rise in the infrared to a new kind of CFTs, analytically accessible, called melonic CFTs. In the first part of the talk, I will briefly…

IAS HET Seminar | Matteo Parisi, Institute for Advanced Study & Harvard University| “TBA” | Bloomberg Lecture Hall & Zoom
Fri, Nov 11, 2022, 1:45 pm1:45 pm
IAS HET Seminar |Masanori Hanada, University of Surrey| “TBA” | Bloomberg Lecture Hall & Zoom
Mon, Oct 31, 2022, 2:30 pm2:30 pm
IAS HET Seminar | Jonah Kudler-Flam, Institute for Advanced Study| “Quantum Information before the Page Time” | Bloomberg Lecture Hall & Zoom
Fri, Oct 21, 2022, 1:45 am1:45 pm

Radiation emitted from evaporating black holes is highly mixed, at least for times prior to the so-called "Page time." Usually, the quantum state of the radiation is then treated as void of information. I will discuss two ways in which this early time radiation contains non-trivial quantum information. First, I will characterize (in simple…

HET Seminar | Pranay Gorantla, Princeton University | “Exotic Field Theories with Dipole Symmetries” | PCTS & Zoom
Fri, Oct 14, 2022, 1:45 pm1:45 pm

I will discuss some exotic QFTs with dipole symmetries which exhibit several peculiar features such as strange ground state degeneracy (GSD), defects with restricted mobility (a.k.a. fractons), and UV/IR mixing. I will focus on simple examples in 1+1d, including a compact version of the Lifshitz field theory. To…

IAS HET Seminar | Nafiz Ishtiaque, Member, School of Natural Sciences, IAS| "Relating Integrable Spin Chains to Gauge Theories via String Theory" | Wolfensohn Hall & Zoom
Fri, May 20, 2022, 1:45 pm1:45 pm

I will discuss some applications of brane constructions of rational integrable spin chains with Verma modules. These spin chains appear in various gauge theories. They can be created in 4d Chern-Simons theories with line operators, mapped to massive vacua of certain 2d N=(2,2) gauge theories using Bethe/Gauge correspondences, described in terms…

HET Seminar | Lorenzo di Pietro, Sissa, International School for Advanced Studies| “Factorization and Global symmetry in holography” | Via Zoom
Fri, May 6, 2022, 1:45 pm1:45 pm

Based on 2203.09537. In the context of toy models of holography arising from 3d Chern-Simons theory, I will describe an approach in which, rather than summing over bulk geometries, one gauges a one-form global symmetry of the bulk theory. This ensures that the bulk theory has no global symmetries, and it makes the partition function on…

IAS HET Seminar | Lance Dixon, Stanford University| "Scattering Amplitudes in Maximally Supersymmetric Gauge Theory and a New Duality" | Wolfensohn Hall & Zoom
Mon, May 2, 2022, 2:30 pm2:30 pm

Scattering amplitudes are the arena where quantum field theory directly meets collider experiments.  An excellent model for scattering in QCD is provided by N=4 super-Yang-Mills theory, particularly in the planar limit of a large number of colors, where the theory becomes integrable, and amplitudes become dual to light-like polygonal Wilson…

POSTPONED!! IAS HET Seminar - Friday, April 22 - 1:45 PM - Wolfensohn Hall & Zoom - "Quantum Error Correction in SYK and Bulk Emergence" - Adam Levine, Member, School of Natural Sciences, IAS
Fri, Apr 29, 2022, 1:45 pm1:45 pm



We will discuss the price of the quantum error correcting codes, defined as the number of physical qubits needed to reconstruct whether a given operator has been acted upon the thermal state or not. By thinking about reconstruction via quantum teleportation…

IAS HET Seminar - Friday, April 22 - 1:45 PM - Wolfensohn Hall & Zoom - "Localized Collisions and the Black Hole Interior" - Felix Haehl, IAS
Fri, Apr 22, 2022, 1:45 pm1:45 pm

We study collisions of localized shockwaves behind the horizon of the eternal AdS black hole. We give a holographic boundary description in terms of the overlap of two growing perturbations in a shared quantum circuit. Due to a competition between different physical effects, the circuit analysis shows dependence on the transverse locations and…

IAS HET Seminar | Amit Sever, Tel-Aviv University| “"Line Operators in Chern-Simons-Matter Theories and Bosonization in Three Dimensions” | Wolfensohn Hall (behind Bloomberg Hall) & on Zoom
Mon, Apr 18, 2022, 2:30 pm2:30 pm

We study Chern-Simons theories at large N with either bosonic or fermionic matter in the fundamental representation. The most fundamental operators in these theories are mesonic line operators, the simplest example being Wilson lines ending on fundamentals. We classify the conformal line operators along an arbitrary smooth path as well as the…

HET Seminar | John Cardy, University of California, Berkeley | “TTbar-deformed modula” | Via Zoom
Mon, Apr 11, 2022, 2:30 pm2:30 pm

Certain objects of conformal field theory, for example partition functions on the rectangle and the torus, and one-point functions on the torus, are either invariant or transform simply under the modular group, properties which should be preserved under the TTbar deformation. The formulation and proof of this statement in fact extends to more…

IAS HET Seminar | Hong Liu, Massachusetts Institute of Technology| “"Emergent Times in Holography” | Via Zoom
Mon, Apr 4, 2022, 2:30 pm2:30 pm

We discuss emergent type III1 von Neumann algebraic structures in the large N limit of certain class of quantum field theories. We show that this is important for understanding various aspects of bulk physics in the AdS/CFT duality, including explicit boundary constructions of Kruskal-like time evolution in an eternal black hole, boundary…

IAS HET Seminar | Javier Fuentes, University of Granada| “Following the Footprints of the B-physics Anomalies” | Wolfensohn Hall (behind Bloomberg Hall) & on Zoom
Mon, Mar 28, 2022, 2:30 pm2:30 pm

Recent B-meson data show a reinforced set of deviations from the Standard Model predictions, pointing to violations of lepton flavor universality. I will critically review these data and discuss their theoretical interpretation, including their possible connection to the hierarchical pattern of fermions masses and mixing angles. To this end, I…

IAS HET Seminar | Matthew Heydeman, Member, School of Natural Sciences, IAS| “Nearly BPS Black Holes in AdS5 and their Spectrum in N=4 SYM” | Wolfensohn Hall (behind Bloomberg Hall) & on Zoom
Fri, Mar 25, 2022, 1:45 pm1:45 pm

In this talk, we will discuss quantum corrections in the gravitational path integral around nearly 1/16-BPS black holes in asymptotically AdS5 x S5 space, dual to heavy operators in N=4 SYM. We argue these quantum corrections come from a version of the N=2 super-Schwarzian theory which captures the breaking of the SU(1,1|1) near horizon…

HET Seminar | Julio Parra-Martinez , Caltech | “Causality constraints on corrections to Einstein gravity” | PCTS Room 407
Mon, Mar 21, 2022, 2:30 pm2:30 pm

We study constraints from causality and unitarity on 2→2 graviton scattering in four-dimensional weakly-coupled effective field theories. Together, causality and unitarity imply dispersion relations that connect low-energy observables to high-energy data. Using such dispersion relations, we derive two-sided bounds on gravitational Wilson…

IAS HET Seminar | Anatoly Dymarsky, University of Kentucky & Skoltech | "Codes and Conformal Field Theories" | Wolfensohn Hall (behind Bloomberg Hall) & on Zoom
Mon, Mar 14, 2022, 2:30 pm2:30 pm

I will review recent progress connecting (quantum) codes with two-dimensional conformal field theories of the Narain type. In the first part of the talk I will show how codes can be used to construct CFTs with large spectral gap. In the second part I will construct a map from a large class of rational Narain CFTs to quantum stabilizer codes.