On the gravitational polarizability of black holes

Details On the gravitational polarizability of black holes On the gravitational polarizability of black holes

2009-06-16

arxiv.org/abs/0906.3003v2

Phys. Rev. D 80, 044017 (2009)

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

17 pages, 1 figure. Minor changes, published version

Scientific paper

The gravitational polarizability properties of black holes are compared and contrasted with their electromagnetic polarizability properties. The "shape" or "height" multipolar Love numbers h_l of a black hole are defined and computed. They are then compared to their electromagnetic analogs h_l^{EM}. The Love numbers h_l give the height of the l-th multipolar "tidal bulge" raised on the horizon of a black hole by faraway masses. We also discuss the shape of the tidal bulge raised by a test mass m, in the limit where m gets very close to the horizon.

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