Horizons and Null Infinity: A Fugue in 4 voices

Abstract

Black hole horizons in equilibrium and null infinity of asymptotically flat space-times are null 3-manifolds but have very different physical connotations. We first show that they share a large number of geometric properties, making them both weakly isolated horizons. We then use this new unified perspective to unravel the origin of the drastic differences in the physics they contain. Interestingly, the themes are woven together in a manner reminiscent of voices in a fugue.

9 pages. v2: minor amendments, one table added. Version to appear in Phys Rev D (Lett)

References in corpus (3)

• Surface charge algebra in gauge theories and thermodynamic integrability
• Charges and Fluxes on (Perturbed) Non-expanding Horizons
• Wald-Zoupas prescription with (soft) anomalies

Cited by in corpus (7)

• Renormalization of conformal infinity as a stretched horizon
• Null Infinity as a Weakly Isolated Horizon
• Quasi-Local Black Hole Horizons: Recent Advances
• Radiation in Fluid/Gravity and the Flat Limit
• Linearized gravity and soft graviton theorem in de Sitter spacetime
• Vacuum Petrov type D horizons of non-trivial $U(1)$ bundle structure over Riemann surfaces with genus $>0$
• News tensor on null hypersurfaces