White holes and eternal black holes

Abstract

We investigate isolated white holes surrounded by vacuum, which correspond to the time reversal of eternal black holes that do not evaporate. We show that isolated white holes produce quasi- thermal Hawking radiation. The time reversal of this radiation, incident on a black hole precursor, constitutes a special preparation that will cause the black hole to become eternal.

Comments: 5 pages, 2 figures, revtex; revised version to appear in Classical and Quantum Gravity