Enhanced Geometry Fluctuations in Minkowski and Black Hole Spacetimes

Details Enhanced Geometry Fluctuations in Minkowski and Black Hole Spacetimes Enhanced Geometry Fluctuations in Minkowski and Black Hole Spacetimes

2008-02-12

arxiv.org/abs/0802.1546v1

Class.Quant.Grav.25:154006,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

13 pages, 3 figures, based on a talk presented at the Peyresq 12 workshop

Scientific paper

10.1088/0264-9381/25/15/154006

We will discuss selected physical effects of spacetime geometry fluctuations, especially the operational signatures of geometry fluctuations and their effects on black hole horizons. The operational signatures which we discuss involve the effects of the fluctuations on images, and include luminosity variations, spectral line broadening and angular blurring. Our main interest will be in black hole horizon fluctuations, especially horizon fluctuations which have been enhanced above the vacuum level by gravitons or matter in squeezed states. We investigate whether these fluctuations can alter the thermal character of a black hole. We find that this thermal character is remarkably robust, and that Hawking's original derivation using transplanckian modes does not seem to be sensitive even to enhanced horizon fluctuations.

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