期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 10, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2012/10/051
关键词
inflation; cosmological perturbation theory
资金
- JSPS [21244033]
- MEXT
- NSFC [10975005]
- Ministry of Education of China
- Grants-in-Aid for Scientific Research [21244033] Funding Source: KAKEN
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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