Journal
PHYSICAL REVIEW D
Volume 85, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.85.083518
Keywords
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Funding
- JSPS [30318802]
- Scientific Research on Innovative Areas [21111006]
- Grants-in-Aid for Scientific Research [24540286, 21111006] Funding Source: KAKEN
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A field kinetic coupling with the Einstein tensor leads to a gravitationally enhanced friction during inflation, by which even steep potentials with theoretically natural model parameters can drive cosmic acceleration. In the presence of this nonminimal derivative coupling, we place observational constraints on a number of representative inflationary models such as chaotic inflation, inflation with exponential potentials, natural inflation, and hybrid inflation. We show that most of the models can be made compatible with the current observational data mainly due to the suppressed tensor-to-scalar ratio.
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