# 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}
}
• Published 8 October 2021
• Mathematics, Physics
• Journal of High Energy Physics
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…
Boundary conditions for warped AdS3 in quadratic ensemble
• Physics
Journal 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
• Mathematics
Journal 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
• Physics
• 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, Physics
Journal 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
• Physics
Journal 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
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
: 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?
• Physics
Physical Review D
• 2022
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

## References

SHOWING 1-10 OF 63 REFERENCES
Flat Space Amplitudes and Conformal Symmetry of the Celestial Sphere
• Mathematics
• 2017
The four-dimensional (4D) Lorentz group $SL(2,\mathbb{C})$ acts as the two-dimensional (2D) global conformal group on the celestial sphere at infinity where asymptotic 4D scattering states are
Charge algebra in Al(A)dSn spacetimes
• Mathematics
• 2020
The gravitational charge algebra of generic asymptotically locally (A)dS spacetimes is derived in $n$ dimensions. The analysis is performed in the Starobinsky/Fefferman-Graham gauge, without assuming
Symmetries and charges of general relativity at null boundaries
• Mathematics
Journal of High Energy Physics
• 2018
A bstractWe study general relativity at a null boundary using the covariant phase space formalism. We define a covariant phase space and compute the algebra of symmetries at the null boundary by
Symplectic and Killing symmetries of AdS3 gravity: holographic vs boundary gravitons
• Physics
• 2016
A bstractThe set of solutions to the AdS3 Einstein gravity with Brown-Henneaux boundary conditions is known to be a family of metrics labeled by two arbitrary periodic functions, respectively left
Spacetime Structure near Generic Horizons and Soft Hair.
• Physics
Physical review letters
• 2020
The spacetime structure near nonextremal horizons in any spacetime dimension greater than two is explored and a wealth of novel results are discovered, including the first explicit near horizon realization of the Bondi-Metzner-Sachs algebra.
Soft Heisenberg hair on black holes in three dimensions
• Physics
• 2016
Three-dimensional Einstein gravity with negative cosmological constant admits stationary black holes that are not necessarily spherically symmetric. We propose boundary conditions for the near
Covariant phase space with boundaries
• Physics
• 2019
The covariant phase space method of Iyer, Lee, Wald, and Zoupas gives an elegant way to understand the Hamiltonian dynamics of Lagrangian field theories without breaking covariance. The original
Local subsystems in gauge theory and gravity
• Physics
• 2016
A bstractWe consider the problem of defining localized subsystems in gauge theory and gravity. Such systems are associated to spacelike hypersurfaces with boundaries and provide the natural setting
Subleading BMS charges and fake news near null infinity
• Physics
Journal of High Energy Physics
• 2019
A bstractIn this paper we establish a relation between the non-linearly conserved New-man-Penrose charges and certain subleading terms in a large-r expansion of the BMS charges in an
TASI Lectures on Holographic Space-time, SUSY, and Gravitational Effective Field Theory
I argue that the conventional field theoretic notion of vacuum state is not valid in quantum gravity. The arguments use gravitational effective field theory, as well as results from string theory,