Backgrounds of squeezed relic photons and their spatial correlations

Details Backgrounds of squeezed relic photons and their spatial correlations Backgrounds of squeezed relic photons and their spatial correlations

1999-08-19

arxiv.org/abs/gr-qc/9908055v1

Phys.Rev. D61 (2000) 087306

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages in LaTex style

Scientific paper

10.1103/PhysRevD.61.087306

We discuss the production of multi-photons squeezed states induced by the time variation of the (Abelian) gauge coupling constant in a string cosmological context. Within a fully quantum mechanical approach we solve the time evolution of the mean number of produced photons in terms of the squeezing parameters and in terms of the gauge coupling. We compute the first (amplitude interference) and second order (intensity interference) correlation functions of the magnetic part of the photon background. The photons produced thanks to the variation of the dilaton coupling are strongly bunched for the realistic case where the growth of the dilaton coupling is required to explain the presence of large scale magnetic fields and, possibly of a Faraday rotation of the Cosmic Microwave Background.

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