Evolution of primordial perturbations and a fluctuating decay rate

Mazumdar, Anupam and Postma, Marieke (2003) Evolution of primordial perturbations and a fluctuating decay rate. Physics Letters B, 573. pp. 5-12. ISSN 0370-2693

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We present a gauge invariant formalism to study the evolution of curvature perturbations during decay of the inflaton or some other field that dominates the energy density. We specialize to the case where the total curvature perturbation arises predominantly from a spatially fluctuating decay rate. Gaussian fluctuations in the decay rate are present if the inflaton coupling or mass depends on some light field, which freely fluctuates during inflation. The isocurvature fluctuations of the light field seeds the total curvature perturbations, whose amplitude freezes after inflaton decay. We also analyze the resulting curvature perturbation starting with non-negligible values of the initial inflaton curvature. Lastly, we study the effects of the energy density stored in the light field.

Item Type:
Journal Article
Journal or Publication Title:
Physics Letters B
Additional Information:
14 pages, 2 figures, discussion added, version to be published in Phys. Lett. B
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Deposited On:
02 May 2013 09:46
Last Modified:
21 Nov 2022 23:33