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Post-inflation increase of the cosmological tensor-to-scalar perturbation ratio. (English) Zbl 1082.83510

Summary: We investigate the possibility that the amplitude of scalar density perturbations may be damped after inflation. This would imply that CMB anisotropies do not uniquely fix the amplitude of the perturbations generated during inflation and that the present tensor-to-scalar ratio might be larger than that produced in inflation, increasing the prospects of detection of primordial gravitational radiation. It turns out, however, that the damping of density perturbations is hard to achieve.

MSC:

83F05 Relativistic cosmology
83C25 Approximation procedures, weak fields in general relativity and gravitational theory
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