Format results
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Celestial Holography from Euclidean AdS space.
Lorenzo Iacobacci - Université Libre de Bruxelles
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Quantum Geometry of the Light Cone
Wolfgang Wieland - University of Erlangen-Nuremberg
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A Novel Perspective on the Continuum Limit in Quantum Gravity
Susanne Schander - Perimeter Institute for Theoretical Physics
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Probing asymptotically safe quantum gravity with matter
Marc Schiffer - Radboud Universiteit Nijmegen
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Is Planckian discreteness observable in cosmology?
Alejandro Perez - Aix-Marseille University
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Gyroscopic gravitational memory from binary systems
Ali Seraj - Université Libre de Bruxelles
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The Corners of 1+1 Dimensional Quantum Gravity
Ludovic Varrin - National Centre for Nuclear Research (NCBJ)
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Quantum Gravity Seminar Series - TBA
Bianca Dittrich - Perimeter Institute for Theoretical Physics
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Curvature correlators in nonperturbative 2D Lorentzian quantum gravity
Renate Loll - Radboud Universiteit Nijmegen
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Embedding generalised LTB models in polymerised spherically symmetric models: formalism and applications
Kristina Giesel - University of Erlangen-Nuremberg
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Type I von Neumann algebras from gravitational path integrals: Ryu–Takayanagi as entropy without holography
Eugenia Colafranceschi - University of California, Santa Barbara
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Celestial Holography from Euclidean AdS space.
Lorenzo Iacobacci - Université Libre de Bruxelles
We will explore the connection between Celestial and Euclidean Anti-de Sitter (EAdS) holography in the massive scalar case. Specifically, exploiting the so-called hyperbolic foliation of Minkowski space-time, we will show that each contribution to massive Celestial correlators can be reformulated as… -
Quantum Geometry of the Light Cone
Wolfgang Wieland - University of Erlangen-Nuremberg
Abstract: In relativity, the geometry of the light cones determines the causal structure of spacetime. Under the influence of gravity, the light cones bend and curve. A previously expanding light cone can fall back into itself. In this way, the causal structure becomes a dynamical aspect of… -
A Novel Perspective on the Continuum Limit in Quantum Gravity
Susanne Schander - Perimeter Institute for Theoretical Physics
Some of the most fundamental challenges in quantum gravity involve determining how to take the continuum limit of the underlying regularized theory and how to preserve the causal structure of space-time. Several approaches to quantum gravity attempt to address these questions, but the technical… -
Probing asymptotically safe quantum gravity with matter
Marc Schiffer - Radboud Universiteit Nijmegen
Asymptotically safe quantum gravity might provide a unified description of the fundamental dynamics of quantum gravity and matter. The realization of asymptotic safety, i.e., of scale symmetry at high energies, constraints the possible interactions and dynamics of a system. In this talk, I will… -
Is Planckian discreteness observable in cosmology?
Alejandro Perez - Aix-Marseille University
A Planck scale inflationary era—in a quantum gravity theory predicting discreteness of quantum geometry at the fundamental scale—produces the scale invariant spectrum of inhomogeneities with very small tensor-to-scalar ratio of perturbations and a hot big bang leading to a natural dark matter… -
Gyroscopic gravitational memory from binary systems
Ali Seraj - Université Libre de Bruxelles
I will review the "gyroscopic gravitational memory”, the permanent effect of gravitational waves on freely-falling gyroscopes far from the source of gravitational radiation. Then, I will compute the effect created by binary systems in the post-Newtonian approximation. The discussion naturally… -
The Corners of 1+1 Dimensional Quantum Gravity
Ludovic Varrin - National Centre for Nuclear Research (NCBJ)
The concept of symmetries is crucial in our comprehension of modern theoretical physics. The Corner Proposal introduces a novel framework where symmetries are reinstated as foundational principles in our understanding of gravity. This aims to describe gravity using a language that is more adapted to… -
Quantum Gravity Seminar Series - TBA
Bianca Dittrich - Perimeter Institute for Theoretical Physics
Abstract TBA --- Zoom link -
Curvature correlators in nonperturbative 2D Lorentzian quantum gravity
Renate Loll - Radboud Universiteit Nijmegen
Correlation functions are ubiquitous in quantum field theory, but their use in quantum gravity beyond perturbative and asymptotically flat regimes has been limited, due to difficulties with diffeomorphism invariance and the dynamical nature of geometry. We address these challenges in the context of… -
Embedding generalised LTB models in polymerised spherically symmetric models: formalism and applications
Kristina Giesel - University of Erlangen-Nuremberg
At the classical level, one can restrict a spherically symmetric model to the corresponding LTB sector by requiring that a so-called LTB condition is satisfied. In this talk we will discuss how this can be generalised in the context of effective models containing quantum gravity inspired… -
From fluctuating gravitons to Lorentzian quantum gravity
I will review recent progress in the asymptotic safety approach to quantum gravity. This includes the computation of momentum-dependent graviton correlation functions, the structure of the Standard Model with asymptotically safe gravity, and the recent first computation directly in space-times with… -
Type I von Neumann algebras from gravitational path integrals: Ryu–Takayanagi as entropy without holography
Eugenia Colafranceschi - University of California, Santa Barbara
We show that the Ryu-Takayanagi (RT) formula, originally introduced to compute the entropy of a holographic boundary CFT, can be interpreted as entropy of an algebra of bulk gravitational observables. In particular, we show that any Euclidean gravitational path integral satisfying a simple and…