## High Energy Theory Events

#### Fall 2023

##### BTZ Black Holes From the Worldsheet

Speaker: Emil Martinec (University of Chicago)

We discuss two aspects of worldsheet string dynamics in the presence of AdS3 (BTZ) black holes. First, we construct AdS3 orbifolds describing conical defect geometries that prepare pure state black holes through Euclidean evolution, and examine aspects of the bulk/boundary correspondence. Second, BTZ black holes can discharge by radiating wound [...]##### Emergent Space and Time in Holographic Duality

Speaker: Samuel Leutheusser (Princeton University)

In holographic duality, a higher dimensional quantum gravity system emerges from a lower dimensional conformal field theory (CFT) with a large number of degrees of freedom. We propose a formulation of duality for a general causally complete bulk spacetime region, called subalgebra-subregion duality, which provides a framework to describe how [...]##### Symmetry, Soft Dynamics and Holography in Asymptotically Flat Spacetimes

Speaker: Daniel Kapec (Harvard University)

Despite our detailed understanding of holography in Anti-de Sitter space, flat space holography remains somewhat mysterious. “Celestial CFT” is one approach to the subject which attempts to recast quantum gravity in (d+2)-dimensional asymptotically flat spacetimes in terms of a d-dimensional Euclidean CFT residing at the conformal boundary. I will discuss [...]##### Generalized Symmetries in String Theory

Speaker: Max Hübner (University of Pennsylvania)

Generalized global symmetries occur in large classes of quantum field theories (QFTs). Whenever a QFT admits a string construction one can ask how structures associated with these symmetries lift and are characterized in the stringy realization of the QFT. For example topological operators realizing these symmetries in many cases admit [...]##### A Lorentz-covariant and Supertranslation-invariant Formula for the Angular Momentum in 4D Asymptotically Flat Space

Speaker: Massimo Porrati (New York University)

The angular momentum radiated in gravitational scattering can be changed by performing a supertranslation of the asymptotic metric, i.e. by adding radiation with infinite wavelength to the metric. This puzzling property can be avoided by adopting a supertranslation -invariant definition of the angular momentum flux in general relativity. None of [...]##### Sturm-Liouville Systems and Gravity Localization on Branes

Speaker: Kelly Stelle (Imperial College London)Host: Gabriel Larios

There is a taxonomy of effective theory types on or near branes in supergravity. One type constitutes consistent embeddings of lower-dimensional supergravities on the worldvolumes, but another leads to a specific concentration of gravity near the worldvolume. The difference lies in the boundary conditions imposed on fluctuation spectra about the [...]##### Logarithmic Corrections to the Entropy of AdS Black Holes

Speaker: Leo Pando Zayas (University of Michigan)

I will review some recent developments within the AdS/CFT correspondence whereby the Bekenstein-Hawking entropy of certain black holes has been given a microscopic, statistical mechanical foundation in terms of partition functions of the dual field theories. At the quantum level, the entropy of black holes is not exactly equal to [...]##### Consistent Truncations and KK Spectra via Exceptional Field Theory

Speaker: Michele Galli (Humboldt University)Host: Gabriel Larios

In this seminar I will discuss how Exceptional field theory provides us with a natural framework to study AdS vacua and their CFT duals. I will start with a review of consistent truncations and their construction via ExFT, I will then describe two recent examples. In the first we constructed [...]##### Emergent N=4 Supersymmetry from N=1

Speaker: Monica Kang (California Institute of Technology)

I will construct 4d N=1,2 SCFTs with identical central charges a=c (without a large N limit) via the diagonal gauging of collections of non-Lagrangian Argyres–Douglas and conformal matter theories. Utilizing a particular family of theories from this construction, I will present a four-dimensional N=1 supersymmetric field theory that is dual [...]##### Towards Natural and Realistic E7 GUTs in F-theory

Speaker: Kobe Li (Massachusetts Institute of Technology)

We consider phenomenological aspects of a natural class of Standard Model-like supersymmetric F-theory vacua realized through flux breaking of rigid E7 gauge factors. We show that three generations of Standard Model matter can arise quite easily in these models. We further find that many other Standard Model-like features can easily [...]##### Horizon Scattering, Partition Functions, and Edge Modes

Speaker: Albert Law (Harvard University)

Despite the tremendous progress Euclidean gravitational path integrals have brought in studies of quantum black holes, its precise statistical interpretation remains not entirely clear. In this talk, I focus on the 1-loop contributions, which amounts to studying free fields living on a black hole background. For the case of a [...]##### The Sub-Leading Scattering Waveform

Speaker: Aidan Herderschee (University of Michigan)

I will showcase the computation of the next-to-leading order scattering waveform in the Post-Minkowskian expansion using amplitude techniques. I will first give an overview of how to compute generic classical observables in gravity using scattering amplitudes in the KMOC formalism. In particular, I will focus on how classical physics systematically [...]##### Quantum Error Correction in Phase Space

Speaker: Yale Fan (University of Texas, Austin)

Ideas from quantum information theory have come to occupy increasingly important roles in theories of fundamental physics. Conversely, fundamental physics offers valuable tools for addressing problems in quantum information and computation. To exemplify the latter perspective, I will describe how ideas of geometric quantization and noncommutative geometry can be applied [...]##### Scramblon Loops

Speaker: Shunyu Yao (Stanford University)

Out of time ordered correlators(OTOC) in certain large N systems can be described by scramblon modes. In large N limit, scramblon exchange dominates, while scramblon interactions are suppressed by 1/N. However, we are going to discuss certain types of scramblon loop corrections, which cause a dramatic breakdown of scramblon exchange [...]##### Late-time Asymptotics of Massive Scalar Fields on a Black Hole

Speaker: Maxime Van De Moortel (Rutgers University)

The Klein-Gordon equation, a foundational model for massive matter, plays a pivotal role in relativistic physics, at the heart of various phenomena such as boson stars, hairy black holes, and superradiant instabilities. Despite its apparent simplicity, understanding the late-time asymptotics of massive scalar fields on a Schwarzschild black hole had [...]