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arXiv · 1505.04027

Revisiting slow-roll inflation in nonminimal derivative coupling with potentials

Yun Soo Myung·Taeyoon Moon·Bum-Hoon Lee
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Abstract

We investigate the slow-roll inflation in the nonminimal derivative coupling (NDC) model with exponential, quadric, and quartic potentials. It was known that this model provides an enhanced slow-roll inflation induced by gravitationally enhanced friction even for a steep exponential potential. In the phase portrait, the inflationary attractor is described by the slow-roll equation. Introducing the autonomous form, the inflation is regarded as an emergence from the saddle point and it leaves this fixed point along the slow-roll equation. We show explicitly that if one uses the NDC with potentials, the slow-roll inflation is easier to be implemented than the canonical coupling with the same potentials.

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Yun Soo Myung, Taeyoon Moon, Bum-Hoon Lee. 2015-09-03. Revisiting slow-roll inflation in nonminimal derivative coupling with potentials. https://doi.org/10.1088/1475-7516%2F2015%2F10%2F007

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