Entropic force in black hole binaries and its Newtonian limits

Details Entropic force in black hole binaries and its Newtonian limits Entropic force in black hole binaries and its Newtonian limits

2011-07-09

arxiv.org/abs/1107.1764v3

Physics

High Energy Physics

High Energy Physics - Theory

Accepted for publication in Phys. Rev. D

Scientific paper

We give an exact solution for the static force between two black holes at the turning points in their binary motion. The results are derived by Gibbs' principle and the Bekenstein-Hawking entropy applied to the apparent horizon surfaces in time-symmetric initial data. New power laws are derived for the entropy jump in mergers, while Newton's law is shown to derive from a new adiabatic variational principle for the Hilbert action in the presence of apparent horizon surfaces. In this approach, entropy is strictly monotonic such that gravity is attractive for all separations including mergers, and the Bekenstein entropy bound is satisfied also at arbitrarily large separations, where gravity reduces to Newton's law. The latter is generalized to point particles in the Newtonian limit by application of Gibbs' principle to world-lines crossing light cones.

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