String theoretic axion coupling and the evolution of cosmic structures

Details String theoretic axion coupling and the evolution of cosmic structures String theoretic axion coupling and the evolution of cosmic structures

1999-07-06

arxiv.org/abs/hep-ph/9907244v1

Phys.Rev. D61 (2000) 084026

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, REVtex

Scientific paper

10.1103/PhysRevD.61.084026

We examine the effects of the axion coupling to $R\tilde{R}$ on the evolution of cosmic structures. It is shown that the evolutions of the scalar- and vector-type perturbations are not affected by this axion coupling. However the axion coupling causes an asymmetric evolution of the two polarization states of the tensor-type perturbation, which may lead to a sizable polarization asymmetry in the cosmological gravitational wave if inflation involves a period in which the axion coupling is important. The polarization asymmetry produced during inflation are conserved over the subsequent evolution as long as the scales remain in the large-scale limit, and thus this may lead to an observable trace in the cosmic microwave background radiation.

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