Reheating and preheating in the simplest extension of Starobinsky inflation

Abstract

The epochs of reheating and preheating are studied in a simple extension of the Starobinsky inflationary model, which consists of an $R^2$--correction to the Einstein--Hilbert action and an additional scalar field. We find that if the $R^2$--correction at the end of inflation is dynamically important, it affects the expansion rate and as a consequence the reheating and preheating processes. While we find that the reheating temperature and duration of reheating are only slightly affected, the effect has to be taken into account when comparing the theory to data. In the case of preheating, the gravitational corrections can significantly affect the decay of the second field. Particle production is strongly affected for certain values of the parameters in the theory.

7 pages, 2 figures, revtex

References in corpus (1)

• Reheating in Inflationary Cosmology: Theory and Applications

Cited by in corpus (11)

• Rescuing Quartic and Natural Inflation in the Palatini Formalism
• Preheating after multifield inflation with nonminimal couplings, II: Resonance Structure
• Nonminimal Coleman--Weinberg Inflation with an $R^2$ term
• Tachyonic Preheating in Palatini $R^2$ Inflation
• Gravitational dynamics in Higgs inflation: Preinflation and preheating with an auxiliary field
• Perfect fluid solutions of Brans-Dicke and f(R)cosmology
• Boltzmann equations for preheating
• Precision predictions of Starobinsky inflation with self-consistent Weyl-squared corrections
• Classical and quantum cosmology of $K$-essentially modified $R^2$ and pure $R^p$ gravity
• Observational Constraints and Preheating in Cuscuton Inflation
• On preheating after inflation in general scalar-tensor theories of gravity