Zobrazeno 1 - 10
of 951
pro vyhledávání: '"P. Ciambelli"'
In this work, we demonstrate that quantizing gravity on a null hypersurface leads to the emergence of a CFT associated with each null ray. This result stems from the ultralocal nature of null physics and is derived through a canonical analysis of the
Externí odkaz:
http://arxiv.org/abs/2407.11132
The corner symmetry algebra organises the physical charges induced by gravity on codimension-$2$ corners of a manifold. In this letter, we initiate a study of the quantum properties of this group. We first describe the central extensions and how the
Externí odkaz:
http://arxiv.org/abs/2406.07101
Chiral shift symmetries of the massless free bosons in two dimensions are global symmetries that are somewhat similar to asymptotic symmetries. They are most transparent in double-null coordinates where they are parametrized by two functions of one v
Externí odkaz:
http://arxiv.org/abs/2405.17722
We show how to encode the radiative degrees of freedom in $4$-dimensional asymptotically AdS spacetimes, using the boundary Cotton and stress tensors. Background radiation leads to a reduction of the asymptotic symmetry group, in contrast to asymptot
Externí odkaz:
http://arxiv.org/abs/2404.02146
Autor:
Ciambelli, Luca
Adopting an intrinsic Carrollian viewpoint, we show that the generic Carrollian scalar field action is a combination of electric and magnetic actions, found in the literature by taking the Carrollian limit of the relativistic scalar field. This leads
Externí odkaz:
http://arxiv.org/abs/2311.04113
Autor:
Ciambelli, Luca, Grumiller, Daniel
Using effective field theory methods, we derive the Carrollian analog of the geodesic action. We find that it contains both `electric' and `magnetic' contributions that are in general coupled to each other. The equations of motion descending from thi
Externí odkaz:
http://arxiv.org/abs/2311.04112
Autor:
Ciambelli, Luca, Lehner, Luis
The fluid-gravity correspondence is a duality between anti-de Sitter Einstein gravity and a relativistic fluid living at the conformal boundary. We show that one can accommodate the causal first-order viscous hydrodynamics recently developed by Bemfi
Externí odkaz:
http://arxiv.org/abs/2310.15427
We initiate a study of gravity focusing on generic null hypersurfaces, non-perturbatively in the Newton coupling. We present an off-shell account of the extended phase space of the theory, which includes the expected spin-2 data as well as spin-0, sp
Externí odkaz:
http://arxiv.org/abs/2309.03932
Publikováno v:
Phys.Rev.D 108 (2023) 12, 126003
We investigate the asymptotic symmetries of three-dimensional AdS Einstein gravity in the Weyl-Fefferman-Graham gauge, which is a generalization of the Fefferman-Graham gauge inducing a Weyl connection as part of the boundary structure. We show that
Externí odkaz:
http://arxiv.org/abs/2308.15480
Autor:
Ciambelli, Luca, D'Alise, Alessandra, D'Esposito, Vittorio, Đorđevic, Dušan, Fernández-Silvestre, Diego, Varrin, Ludovic
After introducing the covariant phase space calculus, Noether's theorems are discussed, with particular emphasis on Noether's second theorem and the role of gauge symmetries. This is followed by the enunciation of the theory of asymptotic symmetries,
Externí odkaz:
http://arxiv.org/abs/2307.08460