# Physics Group Meeting

### Wick Rotation and the Positivity of Energy in Quantum Field Theory

I shall present joint work with Maxim Kontsevich (arXiv:2105.10161) describing an interesting domain of complex metrics on a smooth manifold. It is a complexification of the space of ordinary Riemannian metrics, and has the Lorentzian metrics (but...

### Quantum Error-Correcting Codes and CFTs

There is a Narain CFT naturally associated to any self-dual quantum stabilizer code.  For these "code CFTs", the constraints of modular invariance reduce to simple algebraic equations satisfied by the enumerator polynomial of the code, which can be...

### Bootstrapping Automorphic Spectra

I will explain how the conformal bootstrap can be adapted to place rigorous bounds on the spectra of automorphic forms on locally symmetric spaces. A locally symmetric space is of the form H\G/K, where G is a non-compact semisimple Lie group, K the...

### Heavy Exotic Mesons

I will introduce the topic of heavy multiquark states, with special attention to the current theoretical and experimental status. I will first review the available experimental information and then discuss them in the context of the two most likely...

Dan Roberts

### Possible Transition Between String Scale Black Holes and Self-gravitating Fundamental Strings

We discuss the possible transition between string scale black holes and self gravitating fundamental strings. We find evidence for a smooth transition in the heterotic string case while in the type II case they cannot be connected as classical...

Marek Karliner

### Review of Measurement-Induced Dynamic Quantum Phase Transitions

David Huse

A new class of phase transitions has been recently studied in quantum many-body systems that are subject to measurements but not otherwise open to any external decoherence.  This phase transition arises from a competition between scrambling dynamics...

### A brief review of some work on BPS states, wall-crossing, hyperkahler geometry, Hitchin systems, etc.

Greg Moore

This talk will give a brief overview focused on six papers written by D. Gaiotto, G. Moore, and A. Neitzke
loosely centered around the topics mentioned in the title. The papers are on the arXiv.
Background reading: Some short reviews are:
https:/...

### Geometric Extremization for Supersymmetric $AdS_3$ and $AdS_2$ Solutions

Jerome Gauntlett

We consider supersymmetric $AdS_3\times Y_7$ solutions of type IIB supergravity dual to N=(0,2) SCFTs in d=2, as well as $AdS_2\times Y_9$ solutions of D=11 supergravity dual to N=2 supersymmetric quantum mechanics, some of which arise as the near...