String theoretic axion coupling and the evolution of cosmic structures

We examine the effects of the axion coupling to R (R) over tilde 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 tenser-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 Juring inflation is conserved over the subsequent evolution as long as the scales remain in the large-scale limit, and thus this may lend to an observable trace in the cosmic microwave background radiation.
Publisher
AMERICAN PHYSICAL SOC
Issue Date
2000-04
Language
ENG
Keywords

ORDER CURVATURE COUPLINGS; COSMOLOGICAL SOLUTIONS; SUPERSTRING COSMOLOGY; GRAVITATIONAL-WAVE; GRACEFUL EXIT; DOMAIN-WALLS; GRAVITY; PERTURBATIONS; DIMENSIONS; MILLIMETER

Citation

PHYSICAL REVIEW D, v.61, no.8

ISSN
0556-2821
URI
http://hdl.handle.net/10203/73426
Appears in Collection
PH-Journal Papers(저널논문)
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