Particle creation in (2+1) circular dust collapse

Details Particle creation in (2+1) circular dust collapse Particle creation in (2+1) circular dust collapse

2007-03-28

arxiv.org/abs/gr-qc/0703142v3

Phys.Rev.D76:064026,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

15 pages, additional material added in Introduction and Discussion, conclusions unchanged, to appear in Physical Review D

Scientific paper

10.1103/PhysRevD.76.064026

We investigate the quantum particle creation during the circularly symmetric collapse of a 2+1 dust cloud, for the cases when the cosmological constant is either zero or negative. We derive the Ford-Parker formula for the 2+1 case, which can be used to compute the radiated quantum flux in the geometric optics approximation. It is shown that no particles are created when the collapse ends in a naked singularity, unlike the 3+1 case. When the collapse ends in a BTZ black hole, we recover the expected Hawking radiation.

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