Non-expanding horizons: multipoles and the symmetry group

Author:

Ashtekar AbhayORCID,Khera NeevORCID,Kolanowski MaciejORCID,Lewandowski Jerzy

Abstract

Abstract It is well-known that blackhole and cosmological horizons in equilibrium situations are well-modeled by non expanding horizons (NEHs) [1–3]. In the first part of the paper we introduce multipole moments to characterize their geometry, removing the restriction to axisymmetric situations made in the existing literature [4]. We then show that the symmetry group $$ \mathfrak{G} $$ G of NEHs is a 1-dimensional extension of the BMS group $$ \mathfrak{B} $$ B . These symmetries are used in a companion paper [5] to define charges and fluxes on NEHs, as well as perturbed NEHs. They have physically attractive properties. Finally, it is generally not appreciated that $$ \mathcal{I} $$ I ±of asymptotically flat space-times are NEHs in the conformally completed space-time. Forthcoming papers will (i) show that $$ \mathcal{I} $$ I ± have a small additional structure that reduces $$ \mathfrak{G} $$ G to the BMS group $$ \mathfrak{B} $$ B , and the BMS charges and fluxes can be recovered from the NEH framework; and, (ii) develop gravitational wave tomography for the late stage of compact binary coalescences: reading-off the dynamics of perturbed NEHs in the strong field regime (via evolution of their multipoles), from the waveform at $$ \mathcal{I} $$ I +.

Publisher

Springer Science and Business Media LLC

Subject

Nuclear and High Energy Physics

Cited by 16 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Null infinity as a weakly isolated horizon;Physical Review D;2024-08-26

2. Null infinity and horizons: A new approach to fluxes and charges;Physical Review D;2024-08-26

3. Carrollian hydrodynamics and symplectic structure on stretched horizons;Journal of High Energy Physics;2024-05-13

4. Horizons and null infinity: A fugue in four voices;Physical Review D;2024-03-18

5. Black Hole Horizons and Their Mechanics;Reference Module in Materials Science and Materials Engineering;2024

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