Format results
-
Generalized angular momentum via Wald-Zoupas
Antoine RIGNON-BRET - Aix-Marseille University
-
(Weyl-)Fefferman-Graham asymptotic symmetries
Arnaud Delfante - University of Mons
-
Model for emergence of spacetime from fluctuations
Barbara Soda - Perimeter Institute for Theoretical Physics
-
Gravitational Observatories
Dionysios Anninos - King's College London
-
3 short stories about the quantum <-> gravity interface
Etera Livine - French National Centre for Scientific Research (CNRS)
-
Metric signature transitions and the cosmological constant
Steffen Gielen - University of Sheffield
-
Weyl-Ambient Metrics, Obstruction Tensors and Their Roles in Holography
Weizhen Jia - University of Illinois Urbana-Champaign
-
Creases, corners and caustics: properties of non-smooth structures on black hole horizons
Harvey Reall - University of Cambridge
-
Asymptotic structure and the characterisation of gravitational
Jose Senovilla - University of the Basque Country
-
Asymptotic structure and the characterisation of gravitational radiation at infinity
Jose Senovilla - University of the Basque Country
-
Asymptotic-safety inspired results and ideas in causal set quantum gravity
Astrid Eichhorn - Universität Heidelberg
-
BMS Field Theories with u(1) Symmetry
Max Riegler - Technische Universität Wien
-
Generalized angular momentum via Wald-Zoupas
Antoine RIGNON-BRET - Aix-Marseille University
In the last years, asymptotic symmetries have regained a lot of interest, and various extensions of the well known BMS group have been considered in the literature. Many charges associated to the diffeomorphisms of the sphere (superboosts and superrotations) have been proposed, but it has not been… -
(Weyl-)Fefferman-Graham asymptotic symmetries
Arnaud Delfante - University of Mons
To develop a quantum gravity theory, it is fundamental to move away from the gauge-fixing approach and instead employ a gauge-free analysis. There is an increasing body of evidence suggesting that the symmetries employed for gauge-fixing might carry charge. Consequently, setting the associated… -
Model for emergence of spacetime from fluctuations
Barbara Soda - Perimeter Institute for Theoretical Physics
We use a result of Hawking and Gilkey to define a Euclidean path integral of gravity and matter which has the special property of being independent of the choice of basis in the space of fields. This property allows the path integral to describe also physical regimes that do not admit position bases… -
Gravitational Observatories
Dionysios Anninos - King's College London
Motivated by the static patch of de Sitter space, we discuss timelike surfaces in general relativity and the initial boundary value problem. We consider the Dirichlet problem and a conformal version thereof. Time permitting we discuss some ideas in lower dimensions. --- Zoom link https://pitp.zoom… -
3 short stories about the quantum <-> gravity interface
Etera Livine - French National Centre for Scientific Research (CNRS)
Building on the fact that quantum uncertainty is a dynamical degree of freedom in itself in quantum mechanics, I will start with the remark that its evolution can provide a notion of intrinsic clock. To illustrate the non-triviality of this idea, we’ll check the dynamics of the uncertainty if… -
Metric signature transitions and the cosmological constant
Steffen Gielen - University of Sheffield
In classical relativity we usually think of the metric signature as fixed, but quantum cosmology already forces us to consider more general situations such as transitions from Riemannian to Lorentzian signature. I will discuss the less studied phenomenon of an overall "flip" where all metric… -
Weyl-Ambient Metrics, Obstruction Tensors and Their Roles in Holography
Weizhen Jia - University of Illinois Urbana-Champaign
Weyl geometry is a natural extension of conformal geometry with Weyl covariance mediated by a Weyl connection. We generalize the Fefferman-Graham (FG) ambient construction for conformal manifolds to a corresponding construction for Weyl manifolds. We first introduce the Weyl-ambient metric motivated… -
Creases, corners and caustics: properties of non-smooth structures on black hole horizons
Harvey Reall - University of Cambridge
The event horizon of a dynamical black hole is generically a non-smooth hypersurface. I shall describe the types of non-smooth structure that can arise on a horizon that is smooth at late time. This includes creases, corners and caustic points. I shall discuss ``perestroikas'' of these structures… -
Asymptotic structure and the characterisation of gravitational
Jose Senovilla - University of the Basque Country
With the main purpose of identifying the existence of gravitational radiation at infinity (scri), a novel approach to the asymptotic structure of spacetime is presented, focusing mainly in cases with non-negative cosmological constant. The basic idea is to consider the strength of tidal forces… -
Asymptotic structure and the characterisation of gravitational radiation at infinity
Jose Senovilla - University of the Basque Country
With the main purpose of identifying the existence of gravitational radiation at infinity (scri), a novel approach to the asymptotic structure of spacetime is presented, focusing mainly in cases with non-negative cosmological constant. The basic idea is to consider the strength of tidal forces… -
Asymptotic-safety inspired results and ideas in causal set quantum gravity
Astrid Eichhorn - Universität Heidelberg
I will argue that a fruitful strategy to make progress in quantum gravity is to connect distinct approaches and transfer methods and ideas from one approach to another. As a concrete example, I will explain recent results in causal-set quantum gravity. The first, namely the construction of a higher… -
BMS Field Theories with u(1) Symmetry
Max Riegler - Technische Universität Wien
Quantum field theories in two dimensions (2d) with an underlying Bondi-van der Burg-Metzner-Sachs (BMS) symmetry augmented by u(1) currents are expected to holographically capture features of charged versions of cosmological solutions in asymptotically flat 3d spacetimes called Flat Space…