arXiv:hep-ph/9906501·v2·High Energy Physics — Phenomenology

Preheating with non-minimally coupled scalar fields in higher-curvature inflation models

S. Tsujikawa🇯🇵 · K. Maeda (Waseda University)🇯🇵 · T. Torii (Tokyo Institute of Technology)🇯🇵

Abstract

In higher-curvature inflation models ( $R + α_{n} R^{n}$ ), we study a parametric preheating of a scalar field $χ$ coupled non-minimally to a spacetime curvature $R$ ( $ξ R χ^{2}$ ). In the case of $R^{2}$ -inflation model, efficient preheating becomes possible for rather small values of $ξ$ , i.e. $∣ ξ ∣ < se v er a l . A l t h o ug h t h e ma x ima l f l u c t u a t i o n$ \sqrt{< \chi^2 >}_{max} \approx 2 \times10^{17} $G e V f or$ \xi \approx -4 $i s a l m os tt h es am e a s t h ec ha o t i c in f l a t i o nm o d e l w i t han o n - minima l l y co u pl e d$ \chi $f i e l d, t h e g r o w t h r a t eo f t h e f l u c t u a t i o nb eco m es m u c h l a r g er an d e f f i c i e n tp r e h e a t in g i sr e a l i z e d . W e a l so in v es t i g a t e p r e h e a t in g f or$ R^4 $m o d e l an df in d t ha tt h e ma x ima l f l u c t u a t i o ni s$ \sqrt{< \chi^2 >}_{max} \approx 8 \times 10^{16} $G e V f or$ \xi \approx -35$.

Comments: 31pages, 12figures

Preheating with non-minimally coupled scalar fields in higher-curvature inflation models

Abstract

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