Black-hole dynamics in BHT massive gravity

Abstract

Using an exact Vaidya-type null-dust solution, we study the area and entropy laws for dynamical black holes defined by a future outer trapping horizon in (2+1)-dimensional Bergshoeff-Hohm-Townsend (BHT) massive gravity. We consider the theory admitting a degenerate (anti-)de Sitter vacuum and pure BHT gravity. It is shown that, while the area of a black hole decreases by the injection of a null dust with positive energy density in several cases, the Wald-Kodama dynamical entropy always increases.

7 pages, 1 figure

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• Conformally flat black holes in Poincaré gauge theory
• Non-Fefferman-Graham asymptotics and holographic renormalization in New Massive Gravity
• Energy of asymptotically AdS black holes in Exotic Massive Gravity and its log-extension
• Vaidya-like exact solutions with torsion
• Dynamical Black Holes in 2+1 Dimensions
• Primordial black holes in a dimensionally oxidizing Universe
• Decreasing entropy of dynamical black holes in critical gravity