Spacetimes containing slowly evolving horizons

TL;DR

This paper reviews the concept of slowly evolving horizons in black hole spacetimes, discussing their properties, examples in various solutions, and their significance in astrophysical black hole processes.

Contribution

It provides a comprehensive review of slowly evolving horizons, including their definition, examples in specific solutions, and their relevance in astrophysical contexts.

Findings

Slowly evolving horizons are common in stellar-scale black hole processes.

Examples include Vaidya, Tolman-Bondi, and tidally distorted black holes.

They are nearly ubiquitous in astrophysical black hole environments.

Abstract

Slowly evolving horizons are trapping horizons that are "almost" isolated horizons. This paper reviews their definition and discusses several spacetimes containing such structures. These include certain Vaidya and Tolman-Bondi solutions as well as (perturbatively) tidally distorted black holes. Taking into account the associated mass scales, they also suggest that slowly evolving horizons are the norm rather than the exception in astrophysical processes that involve stellar-scale black holes.