# Null boundary phase space: slicings, news & memory

@article{Adami2021NullBP, title={Null boundary phase space: slicings, news \& memory}, author={Hamed Adami and Daniel Grumiller and M. M. Sheikh-Jabbari and Vahid Taghiloo and Hossein Yavartanoo and C'eline Zwikel}, journal={Journal of High Energy Physics}, year={2021} }

Abstract
We construct the boundary phase space in D-dimensional Einstein gravity with a generic given co-dimension one null surface $$ \mathcal{N} $$
N
as the boundary. The associated boundary symmetry algebra is a semi-direct sum of diffeomorphisms of $$ \mathcal{N} $$
N
and Weyl rescalings. It is generated by D towers of surface charges that are generic functions over $$ \mathcal{N} $$
N
. These surface charges can be rendered integrable for appropriate slicings of the phase space…

## 12 Citations

Boundary conditions for warped AdS3 in quadratic ensemble

- PhysicsJournal of High Energy Physics
- 2022

Abstract
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 not true…

Symmetries at Causal Boundaries in 2D and 3D Gravity

- Physics
- 2022

We study 2d and 3d gravity theories on spacetimes with causal (timelike or null) codimension one boundaries while allowing for variations in the position of the boundary. We construct the…

Boundary Heisenberg algebras and their deformations

- MathematicsJournal of High Energy Physics
- 2022

Abstract
We investigate the deformations and rigidity of boundary Heisenberg-like algebras. In particular, we focus on the Heisenberg and Heisenberg ⊕ $$ \mathfrak{witt} $$
witt
algebras which…

Higher spin dynamics in gravity and $w_{1 + \infty}$ celestial symmetries

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- 2021

In this paper we extract from a large- r expansion of the vacuum Einstein’s equations a dynamical system governing the time evolution of an inﬁnity of higher-spin charges. Upon integration, we…

Celestial Klein Spaces

- Mathematics
- 2021

We consider the analytic continuation of (p + q)-dimensional Minkowski space (with p and q even) to (p, q)-signature, and study the conformal boundary of the resulting “Klein space”. Unlike the…

Supertranslations at timelike infinity

- Mathematics, PhysicsJournal of High Energy Physics
- 2022

Abstract
We propose a definition of asymptotic flatness at timelike infinity in four spacetime dimensions. We present a detailed study of the asymptotic equations of motion and the action of…

Near horizon gravitational charges

- PhysicsJournal of High Energy Physics
- 2022

Abstract
In this paper, we study the near horizon symmetry and gravitational charges in the Newman-Penrose formalism. In particular we investigate the effect from topological terms. We find that the…

A canonical bracket for open gravitational system

- Physics
- 2021

This paper shows that the generalization of the Barnich-Troessaert bracket recently proposed to represent the extended corner algebra can be obtained as the canonical bracket for an extended…

Null Surface Thermodynamics in Topologically Massive Gravity

- Physics
- 2022

: We study three dimensional topologically massive gravity (TMG) in presence of a generic codimension one null boundary. The existence of the boundary is accounted for by enlarging the Hilbert space…

Can we detect a supertranslated black hole?

- PhysicsPhysical Review D
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We attempt to address the question whether standard tests of general relativity can detect the presence of supertranslation fields. As a stationary supertranslated configuration would not be…

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