• Open Access

Generic analysis of kinetically driven inflation

Rio Saitou
Phys. Rev. D 97, 083511 – Published 16 April 2018

Abstract

We perform a model-independent analysis of kinetically driven inflation (KDI) which (partially) includes generalized G-inflation and ghost inflation. We evaluate the background evolution splitting into the inflationary attractor and the perturbation around it. We also consider the quantum fluctuation of the scalar mode with a usual scaling and derive the spectral index, ignoring the contribution from the second-order products of slow-roll parameters. Using these formalisms, we find that within our generic framework the models of KDI which possess the shift symmetry of scalar field cannot create the quantum fluctuation consistent with the observation. Breaking the shift symmetry, we obtain a few essential conditions for viable models of KDI associated with the graceful exit.

  • Received 20 October 2017

DOI:https://doi.org/10.1103/PhysRevD.97.083511

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Rio Saitou*

  • Leung Center for Cosmology and Particle Astrophysics, National Taiwan University, Taipei, Taiwan 10617 and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China

  • *rsaito@ntu.edu.tw

Article Text

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Issue

Vol. 97, Iss. 8 — 15 April 2018

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