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Noncanonical two-field inflation to order $ξ^{2}$ $ξ^{2}$

Yun-Chao Wang

http://orcid.org/0000-0002-4124-2650

Department of Physics, East China Normal University, Shanghai 200241, P. R. China

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and

Towe Wang

Department of Physics, East China Normal University, Shanghai 200241, P. R. China

E-mail Address: twang@phy.ecnu.edu.cn

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https://doi.org/10.1142/S0218271818500268Cited by:4 (Source: Crossref)

Abstract

In noncanonical two-field inflation models, deviations from the canonical model can be captured by a parameter $ξ$ $ξ$ . We show this parameter is usually one half of the slow-roll order and analytically calculate the primordial power spectra accurate to order $ξ^{2}$ $ξ^{2}$ . The super-horizon perturbations are studied with an improved method, which gives a correction of order $ξ^{2}$ $ξ^{2}$ . Three typical examples demonstrate that our analytical formulae of power spectra fit well with numerical simulation.

Keywords:

PACS: 98.80Cq

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