184 citations · 1.2k across the 37 of their papers we have counts for
38 papers
The Phase Space of Gravity on Null Hypersurfaces
Luca Ciambelli, Laurent Freidel, Robert G. Leigh
We construct the bulk kinematical Poisson structure of general relativity on a caustic-free null segment, prior to imposing the Raychaudhuri and Damour constraints. We first show t…
From Asymptotically Flat Gravity to Finite Causal Diamonds
Luca Ciambelli, Temple He, Kathryn M. Zurek
We demonstrate that the phase space of the soft sector of asymptotically flat gravity in four spacetime dimensions can be identified with that of a spherically symmetric finite cas…
Foundations of Carrollian Geometry
Luca Ciambelli, Puttarak Jai-akson
Carrollian physics provides the natural framework for describing null hypersurfaces. This review explores the geometry of Carrollian manifolds -- spaces endowed with a degenerate m…
Entanglement Entropy of Quantum Corners
Luca Ciambelli, Jerzy Kowalski-Glikman, Ludovic Varrin
In gravitational theories with boundaries, diffeomorphisms can become physical and acquire a non-vanishing Noether charge. Using the covariant phase space formalism, on shell of th…
Radiation in Fluid/Gravity and the Flat Limit
Gabriel Arenas-Henriquez, Luca Ciambelli, Felipe Diaz +2
We explore asymptotically locally anti-de Sitter spacetimes exhibiting gravitational radiative behavior, employing null gauges that allow for a well-defined flat limit. The radiati…
Quantum Area Fluctuations from Gravitational Phase Space
Luca Ciambelli, Temple He, Kathryn M. Zurek
We study the gravitational phase space associated to a stretched horizon within a finite-sized causal diamond in -dimensional spacetimes. By imposing the Raychaudhuri equati…
pychop: Emulating Low-Precision Arithmetic in Numerical Methods and Neural Networks
Erin Carson, Xinye Chen
Motivated by the growing demand for reduced-precision arithmetic in computational science, we exploit lower-precision emulation in Python{--}widely regarded as the dominant program…
Geometric modular flows in 2d CFT and beyond
Jacqueline Caminiti, Federico Capeccia, Luca Ciambelli +1
We study geometric modular flows in two-dimensional conformal field theories. We explore which states exhibit a geometric modular flow with respect to a causally complete subregion…
Field-dependent diffeomorphisms and the transformation of surface charges between gauges
Luca Ciambelli, Marc Geiller
When studying gauge theories in the presence of boundaries, local symmetry transformations are typically classified as gauge or physical depending on whether the associated charges…
Dynamical Edge Modes in Yang-Mills Theory
Adam Ball, Luca Ciambelli
We study the symplectic structure and dynamics of Yang-Mills theory in the presence of a boundary. We introduce a decomposition of the fields on a Cauchy slice such that the symple…
Quantum Null Geometry and Gravity
Luca Ciambelli, Laurent Freidel, Robert G. Leigh
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 nat…
Quantum Corner Symmetry: Representations and Gluing
Luca Ciambelli, Jerzy Kowalski-Glikman, Ludovic Varrin
The corner symmetry algebra organises the physical charges induced by gravity on codimension- corners of a manifold. In this letter, we initiate a study of the quantum propertie…
Radiation in Holography
Luca Ciambelli, Sabrina Pasterski, Elisa Tabor
We show how to encode the radiative degrees of freedom in -dimensional asymptotically AdS spacetimes, using the boundary Cotton and stress tensors. Background radiation leads to…
Dynamics of Carrollian Scalar Fields
Luca Ciambelli
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 ta…
Carroll geodesics
Luca Ciambelli, Daniel Grumiller
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 gene…
Fluid-gravity correspondence and causal first-order relativistic viscous hydrodynamics
Luca Ciambelli, Luis Lehner
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 th…
Null Raychaudhuri: Canonical Structure and the Dressing Time
Luca Ciambelli, Laurent Freidel, Robert G. Leigh
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…
Symmetries and Charges in Weyl-Fefferman-Graham Gauge
Luca Ciambelli, Arnaud Delfante, Romain Ruzziconi +1
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 induc…
Cornering Quantum Gravity
Luca Ciambelli, Alessandra D'Alise, Vittorio D'Esposito +3
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…
Holographic Lorentz and Carroll Frames
Andrea Campoleoni, Luca Ciambelli, Arnaud Delfante +3
Relaxing the Bondi gauge, the solution space of three-dimensional gravity in the metric formulation has been shown to contain an additional free function that promotes the boundary…
Universal Corner Symmetry and the Orbit Method for Gravity
Luca Ciambelli, Robert G. Leigh
A universal symmetry algebra organizing the gravitational phase space has been recently found. It corresponds to the subset of diffeomorphisms that become physical at corners -- co…
Boundary Conditions for Warped AdS in Quadratic Ensemble
Ankit Aggarwal, Luca Ciambelli, Stéphane Detournay +1
In the context of warped conformal field theories (WCFT), the derivation of the warped Cardy formula relies on the zero mode spectrum being bounded from below. Generically, this is…
Embeddings and Integrable Charges for Extended Corner Symmetry
Luca Ciambelli, Robert G. Leigh, Pin-Chun Pai
We revisit the problem of extending the phase space of diffeomorphism-invariant theories to account for embeddings associated with the boundary of sub-regions. We do so by emphasiz…
Isolated Surfaces and Symmetries of Gravity
Luca Ciambelli, Robert G. Leigh
Conserved charges in theories with gauge symmetries are supported on codimension-2 surfaces in the bulk spacetime. It has recently been suggested that various classical formulation…