Quantum Fields in an Expanding Universe

Details Quantum Fields in an Expanding Universe Quantum Fields in an Expanding Universe

1999-09-02

arxiv.org/abs/gr-qc/9909007v1

Class.Quant.Grav.16:3923-3935,1999

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

15 pp, no figures, accepted for publication in Class. Quantum Grav

Scientific paper

10.1088/0264-9381/16/12/310

We extend our analysis for scalar fields in a Robertson-Walker metric to the electromagnetic field and Dirac fields by the method of invariants. The issue of the relation between conformal properties and particle production is re-examined and it is verified that the electromagnetic and massless spinor actions are conformal invariant, while the massless conformally coupled scalar field is not. For the scalar field case it is pointed out that the violation of conformal simmetry due to surface terms, although ininfluential for the equation of motion, does lead to effects in the quantized theory.

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