Particle production in the oscillating inflation model

Abstract

We investigate the particle production of a scalar field $\chi$ coupled to an inflaton field $\varphi$ ($g^2{\varphi }^2{\chi }^2/2$) in the {\it oscillating inflation} model, which was recently proposed by Damour and Mukhanov. Although the fluctuation of the $\varphi$ field can be effectively enhanced during a stage of the oscillating inflation, the maximum fluctuation is suppressed as the critical value ${\varphi }_c$ which indicates the scale of the core part of the inflaton potential decreases, in taking into account the back reaction effect of created particles. As for the $\chi$ particle production, we find that larger values of the coupling constant $g$ are required to lead to an efficient parametric resonance with the decrease of ${\varphi }_c$, because an effective mass of inflaton around the minimum of its potential becomes larger. However, it is possible to generate the superheavy $\chi$ particle whose mass is greater than $10^{14}$ GeV, which would result in an important consequence for the GUT baryogenesis.

18 pages, 14 figures

References in corpus (1)

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

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• Inflation in Weyl Scaling Invariant Gravity with $R^3$ Extensions
• Quantum Remnant as Dark Energy and Dark Matter