Consistency of warm k-inflation

Zhi-Peng Peng, Jia-Ning Yu, Jian-Yang Zhu, and Xiao-Min Zhang
Phys. Rev. D 94, 103531 – Published 29 November 2016

Abstract

We extend k-inflation which is a type of kinetically driven inflationary model under the standard inflationary scenario to a possible warm inflationary scenario. The dynamical equations of this warm k-inflation model are obtained. We rewrite the slow-roll parameters which are different from the usual potential driven inflationary models and perform a linear stability analysis to give the proper slow-roll conditions in warm k-inflation. Two cases, a power-law kinetic function and an exponential kinetic function, are studied, when the dissipative coefficient Γ=Γ0 and Γ=Γ(ϕ), respectively. A proper number of e-folds is obtained in both concrete cases of warm k-inflation. We find a constant dissipative coefficient (Γ=Γ0) is not a workable choice for these two cases while the two cases with Γ=Γ(ϕ) are self-consistent warm inflationary models.

  • Received 7 September 2016

DOI:https://doi.org/10.1103/PhysRevD.94.103531

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Zhi-Peng Peng*, Jia-Ning Yu, and Jian-Yang Zhu

  • Department of Physics, Beijing Normal University, Beijing 100875, China

Xiao-Min Zhang§

  • School of Science, Qingdao University of Technology, Qingdao 266033, China

  • *zhipeng@mail.bnu.edu.cn
  • yujn@mail.bnu.edu.cn
  • zhujy@bnu.edu.cn
  • §zhangxm@mail.bnu.edu.cn

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Issue

Vol. 94, Iss. 10 — 15 November 2016

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