Format results
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Dressing up naked singularities
Marija Tomašević - University of Amsterdam
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Quantum Corner Algebra(s): A Proposal
Jerzy Kowalski-Glikman - University of Wrocław
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Towards the Quantization of Cylindrically Symmetric Spacetimes
Javier Peraza - Perimeter Institute for Theoretical Physics
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An Invitation to Quantum Conditional Probability with Applications to Non-Invertible Symmetries and the Generalized Entropy
Marc Klinger - University of Illinois Urbana-Champaign
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Lessons from the Lorentzian Path Integral: Not All Saddles Matter
Maciej Kolanowski - University of California, Santa Barbara
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Edge Modes: from classical to quantum and from discrete to continuum
Goncalo Araujo Regado - Okinawa Institute of Science and Technology
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Thermodynamics of gravity at finite cutoff
Batoul Banihashemi
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Energy Detectors, OPEs and Soft Modes in Asymptotically Flat Gravity
Hernan Gonzalez - San Sebastián University
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Dressing up naked singularities
Marija Tomašević - University of Amsterdam
Small naked singularities—those not shielded by a macroscopic event horizon—are ubiquitous in classical General Relativity. Their existence constitutes apparent violations of the weak cosmic censorship conjecture, which asserts that physically reasonable solutions should appear regular to asymptotic… -
Quantum Corner Algebra(s): A Proposal
Jerzy Kowalski-Glikman - University of Wrocław
In this talk, I will argue that the universal structure of the corner algebra offers a new perspective on quantum gravity, in which the representation theory of this algebra plays a role as fundamental as that of the Poincaré algebra in quantum field theory. I will discuss the representation theory… -
Towards the Quantization of Cylindrically Symmetric Spacetimes
Javier Peraza - Perimeter Institute for Theoretical Physics
In this talk, we will provide an overview of recent developments in the quantization of Cylindrically symmetric spacetimes, which contain the Einstein-Rosen gravitational waves. This class of solutions leads to an integrable field theory, and its phase space can be expressed directly in terms of… -
Dynamical Black Hole Entropy as an Adiabatic Invariant Hamiltonian
Yuki Yokokura - RIKEN
We study thermodynamics of spherically-symmetric spacetime with the aim of exploring spacetime entropy as an adiabatic invariant. We first describe the geometry and dynamics in terms of a local frame adapted to spherical foliations and find a geometro-hydrodynamic interpretation: the spacetime can… -
An Invitation to Quantum Conditional Probability with Applications to Non-Invertible Symmetries and the Generalized Entropy
Marc Klinger - University of Illinois Urbana-Champaign
Carrying the insights of conditional probability to the quantum realm is notoriously difficult due to the non-commutative nature of quantum observables. Nevertheless, conditional expectations on C* and von Neumann algebras have played a significant role in the development of quantum information… -
The Calculus of Observables in Perturbative Quantum Gravity
Allic Sivaramakrishnan - Caltech
Spacetime fluctuations can invalidate usual notions of distance, time, and even what it means to perform an experiment. This raises a simple question: when spacetime fluctuates, how do we describe what happens? Few detailed answers exist, even in the low-energy effective field theory of quantum… -
Fluid/Gravity Correspondence for Quantum Gravity Fluctuations
Sang-Eon Bak
Whether quantum gravitational effects can be enhanced beyond the Planck scale is an important question for testing quantum gravity. In this talk, I will present how the fluid/gravity correspondence provides insight into the enhancement of quantum gravity fluctuations in a finite causal diamond. I… -
Lessons from the Lorentzian Path Integral: Not All Saddles Matter
Maciej Kolanowski - University of California, Santa Barbara
When performing the gravitational path integral, multiple saddles can contribute to a given computation. In black hole thermodynamics, one encounters infinitely many critical points of the action, most of which are complex. Surprisingly, the sum over these saddles diverges in spacetime dimensions… -
Edge Modes: from classical to quantum and from discrete to continuum
Goncalo Araujo Regado - Okinawa Institute of Science and Technology
In this talk, I will describe recent developments in our understanding of edge modes associated to subregions in gauge theories, leveraging their realization as reference frames. I will begin with the picture in classical Maxwell theory, where I will introduce the concept of subregional Goldstone… -
Thermodynamics of gravity at finite cutoff
Batoul Banihashemi
Defining thermodynamic ensembles for gravitational systems is tied to specifying boundary conditions. In this talk I'll first briefly review how introducing a Dirichlet timelike boundary clarifies thermodynamics of de Sitter space. Then I'll discuss geometries subjected to conformal boundary… -
Yang Mills Topology and Spectral Probes of Quantum Spacetime - Quantum Gravity Seminar
Daniel Nemeth
Most physical theories assume that spacetime is four dimensional, a claim strongly supported by high precision accelerator and cosmological measurements. It is also well known that at the Planck scale our quantum theories, and perhaps physics itself, break down. This raises a natural question: what… -
Energy Detectors, OPEs and Soft Modes in Asymptotically Flat Gravity
Hernan Gonzalez - San Sebastián University
In this talk, we analyze detector operators that measure energy to the power ∆-2 at null infinity in Einstein gravity. These operators transform as conformal primaries on the celestial sphere and provide a natural basis for describing energy-flux observables in scattering processes. Using the…