Vacuum polarization on the spinning circle

Details Vacuum polarization on the spinning circle Vacuum polarization on the spinning circle

2001-12-20

arxiv.org/abs/gr-qc/0112055v2

Phys.Rev. D65 (2002) 107503

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

3 pages, no figures, REVTeX4, published version

Scientific paper

10.1103/PhysRevD.65.107503

Vacuum polarization of a massive scalar field in the background of a two-dimensional version of a spinning cosmic string is investigated. It is shown that when the `radius of the universe' is such that spacetime is globally hyperbolic the vacuum fluctuations are well behaved, diverging though on the `chronology horizon'. Naive use of the formulae when spacetime is nonglobally hyperbolic leads to unphysical results. It is also pointed out that the set of normal modes used previously in the literature to address the problem gives rise to two-point functions which do not have a Hadamard form, and therefore are not physically acceptable. Such normal modes correspond to a locally (but not globally) Minkowski time, which appears to be at first sight a natural choice of time to implement quantization.

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