Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 10, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2012/10/051
Keywords
inflation; cosmological perturbation theory
Funding
- JSPS [21244033]
- MEXT
- NSFC [10975005]
- Ministry of Education of China
- Grants-in-Aid for Scientific Research [21244033] Funding Source: KAKEN
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We revisit a two-component inflaton model with a turning trajectory in the field space, where the field slowly rolls down along the trajectory. We consider the case when the effective mass in the direction perpendicular to the trajectory, namely the isocurvature direction, is either of the same order as or much larger than the Hubble parameter. Assuming that the turning angular velocity is small, we compute analytically the corrections to the power spectrum of curvature perturbation caused by the mediation of the heavy isocurvature perturbation, and compare our analytic results with the numerical ones. Especially, when M-eff(2) >> H-2, we find that it is proportional to M-eff(-2). This result is consistent with the one obtained previously by an effective field theory approach.
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