A new delta N formalism for multi-component inflation

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The delta N formula that relates the. final curvature perturbation on comoving slices to the in. inflaton perturbation on. at slices after horizon crossing is a powerful and intuitive tool for computing the curvature perturbation spectrum from inflation. However, it is customarily assumed further that the conventional slow-roll condition is satisfied, and satisfied by all components, during horizon crossing. In this paper, we develop a new dN formalism for multi-component inflation that can be applied in the most general situations. This allows us to generalize the idea of general slow-roll inflation to the multi-component case, in particular only applying the general slow-roll condition to the relevant component. We compute the power spectrum of the curvature perturbation in multi-component general slow-roll inflation, and find that under quite general conditions it is invertible.
Publisher
IOP PUBLISHING LTD
Issue Date
2005-10
Language
English
Article Type
Article
Keywords

PERTURBATIONS; 2ND-ORDER; SPECTRUM

Citation

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, v.53, pp.3415 - 3421

ISSN
1475-7516
DOI
10.1088/1475-7516/2005/10/004
URI
http://hdl.handle.net/10203/91316
Appears in Collection
PH-Journal Papers(저널논문)
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