Format results
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Quantum Information-Inspired Tests of Quantum Gravity
Vlatko Vedral
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Simulating a quantised black hole
Ruth Gregory - King's College London
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Celestial CFT from Dimensional Reduction of CFT
Leonardo Pipolo de Gioia
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Covariant Loop Quantum Gravity with a Cosmological Constant
Qiaoyin Pan - Florida Atlantic University
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Quantum Gravity and Black Hole Evaporation
Jonas Neuser - Institute for Quantum Gravity, Friedrich-Alexander-Universität
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Extending phase spaces at null infinity with the Stueckelberg's trick
Javier Peraza - Perimeter Institute for Theoretical Physics
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Phase Spaces and Operator Algebras for Subregions in Gauge Theory and Quantum Gravity
Marc Klinger - University of Illinois Urbana-Champaign
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Towards realistic tensor network holography using loop gravity
Simon Langenscheidt
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Gauge theories and boundaries: from superselection to soft modes and memory
Aldo Riello - Perimeter Institute for Theoretical Physics
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Quantum Information-Inspired Tests of Quantum Gravity
Vlatko Vedral
I plan to review several ways of testing if the gravitational field has quantum aspects in the low energy regime. I explain why the hybrid (half quantum/half classical) models are inadequate and how they could be ruled out. Furthermore, I maintain that there is no prima facie reason to expect… -
Simulating a quantised black hole
Ruth Gregory - King's College London
Horizons can occur in a wide range of physical situations, many of which we can construct in the lab. Most gravity simulators observe features, like super-radiance, that are analysed as a continuum effect in gravity, whereas many interesting "beyond GR" features theorise about the impact of… -
Celestial CFT from Dimensional Reduction of CFT
Leonardo Pipolo de Gioia
The Celestial Holography conjecture posits the existence of a codimension two theory whose correlators compute the S-matrix in a conformal primary basis. Although resembling a CFT in several respects, the intrinsic definition of this proposed dual theory remains elusive. In this talk, I will discuss… -
Covariant Loop Quantum Gravity with a Cosmological Constant
Qiaoyin Pan - Florida Atlantic University
Covariant loop quantum gravity, commonly referred to as the spinfoam model, provides a regularization for the path integral formalism of quantum gravity. A 4-dimensional Lorentzian spinfoam model with a non-zero cosmological constant has been developed based on quantum SL(2,C) Chern-Simons theory on… -
Quantum Gravity and Black Hole Evaporation
Jonas Neuser - Institute for Quantum Gravity, Friedrich-Alexander-Universität
Hawking’s seminal result, that black holes behave as black bodies with a non-vanishing temperature, suggests that black holes should evaporate. However, Hawking’s derivation is incomplete, as it neglects the backreaction between radiation and geometry. In this talk, we will present a novel approach… -
Extending phase spaces at null infinity with the Stueckelberg's trick
Javier Peraza - Perimeter Institute for Theoretical Physics
The study of symmetries at null infinity and their connection with soft theorems via Ward identities has been the subject of intense research over the past decade. The organization of the symmetries in a clear - geometric - structure that reflects the subleading infrared effects has led to numerous… -
Emergent Modified Gravity: Covariant framework for effective (Loop) Quantum Gravity
Erick Duque
Emergent Modified Gravity (EMG) is a post-Einsteinian theory of canonical gravity. In this formulation, modified constraints are required to preserve an algebra of hypersurface deformation form and will in general imply modified structure functions. This procedure leads to the conclusion that… -
Phase Spaces and Operator Algebras for Subregions in Gauge Theory and Quantum Gravity
Marc Klinger - University of Illinois Urbana-Champaign
What does it mean to specify a subregion in a diffeomorphism invariant fashion? This subtle question lies at the heart of many deep problems in quantum gravity. In this talk, we will explore a program of research aimed at answering this question. The two principal characters of the presentation are… -
Towards realistic tensor network holography using loop gravity
Simon Langenscheidt
In order to understand many Quantum information aspects of the Ads/CFT correspondence, tensor network toy models of holography have been a useful and concrete tool. However, these models traditionally lack many features of their continuum counterparts, limiting their applicability in arguments about… -
Why there is (almost) nothing rather than something? On the cosmological constant problem.
Jerzy Kowalski-Glikman - University of Wrocław
The failure to calculate the vacuum energy remains a central problem in theoretical physics. In my talk I present a new understanding of the cosmological constant problem, grounded in the insight that vacuum energy density can be expressed in terms of phase space volume. Introduction of a UV-IR… -
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Gauge theories and boundaries: from superselection to soft modes and memory
Aldo Riello - Perimeter Institute for Theoretical Physics
I present an overview of the work I have done over the last few years on the phase space structure of gauge theories in the presence of boundaries. Starting with primers on the covariant phase space and symplectic reduction, I then explain how their generalization when boundaries are present fits…