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

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

1999-06-25

arxiv.org/abs/hep-ph/9906501v2

Phys.Rev.D60:123505,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

31pages, 12figures

Scientific paper

10.1103/PhysRevD.60.123505

In higher-curvature inflation models ($R+\alpha_n R^n$), we study a parametric preheating of a scalar field $\chi$ coupled non-minimally to a spacetime curvature $R$ ($\xi R \chi^2$). In the case of $R^2$-inflation model, efficient preheating becomes possible for rather small values of $\xi$, i.e. $|\xi|< several. Although the maximal fluctuation $\sqrt{< \chi^2 >}_{max} \approx 2 \times10^{17}$ GeV for $\xi \approx -4$ is almost the same as the chaotic inflation model with a non-minimally coupled $\chi$ field, the growth rate of the fluctuation becomes much larger and efficient preheating is realized. We also investigate preheating for $R^4$ model and find that the maximal fluctuation is $\sqrt{< \chi^2 >}_{max} \approx 8 \times 10^{16}$ GeV for $\xi \approx -35$.

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