Hillclimbing inflation in metric and Palatini formulations

Jinno, Ryusuke (Center for Theoretical Physics of the Universe, Institute for Basic Science (IBS), Daejeon, 34126, Republic of Korea) ; Kaneta, Kunio (William I. Fine Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, 55455, USA) ; Oda, Kin-ya (Department of Physics, Osaka University, Osaka, 560-0043, Japan) ; Park, Seong Chan  (Department of Physics & IPAP, Yonsei University, Seoul, 03722, Republic of Korea)

12 March 2019

Abstract: A new setup of cosmic inflation with a periodic inflaton potential and conformal factor is discussed in the metric and Palatini formulations of gravity. As a concrete example, we focus on a natural-inflation-like inflaton potential, and show that the inflationary predictions fall into the allowed region of cosmic microwave background observations in both formulations.

Published in: Physics letters B (2019)
Published by: Elsevier
DOI: 10.1016/j.physletb.2019.03.012
License: CC-BY-3.0

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