Inflaton decay and reheating in nonminimal derivative coupling

Abstract

We investigate the inflaton decay and reheating period after the end of inflation in the non-minimal derivative coupling (NDC) model with chaotic potential. In general, this model is known to provide an enhanced slow-roll inflation caused by gravitationally enhanced friction. We find violent oscillations of Hubble parameter which induces oscillations of the sound speed squared, implying the Lagrangian instability of curvature perturbation $\zeta$ under the comoving gauge $\phi =0$. Also, it is shown that the curvature perturbation blows up at $\dot{\varphi }=0$, leading to the breakdown of the comoving gauge at $\dot{\varphi }=0$. Therefore, we use the Newtonian gauge to perform the perturbation analysis where the Newtonian potential is employed as a physical variable. The curvature perturbation is not considered as a physical variable which describes a relevant perturbation during reheating.

1+18 pages, 11 figures, accepted for publication in JCAP

References in corpus (9)

• Nonperturbative Dynamics Of Reheating After Inflation: A Review
• Maximal freedom at minimum cost: linear large-scale structure in general modifications of gravity
• Collapse of Small-Scale Density Perturbations during Preheating in Single Field Inflation
• Potential-driven Galileon inflation
• Non-isotropy in the CMB power spectrum in single field inflation
• Particle Production after Inflation with Non-minimal Derivative Coupling to Gravity
• Curvaton with Nonminimal Derivative Coupling to Gravity II: Full Perturbation Analysis
• Revisiting slow-roll inflation in nonminimal derivative coupling with potentials
• On the breakdown of the curvature perturbation ζ during reheating

Cited by in corpus (8)

• Gravitational Particle Production in Oscillating Background and Its Cosmological Implications
• Palatini-Higgs inflation with non-minimal derivative coupling
• Generalized Non-Minimal Derivative Coupling: Application to Inflation and Primordial Black Hole Production
• Reheating predictions in Gravity Theories with Derivative Coupling
• Successful Higgs inflation from combined nonminimal and derivative couplings
• Irreversible thermodynamical description of warm inflationary cosmological models
• Warm inflation with non-comoving scalar field and radiation fluid
• Reheating mechanism of Curvaton with Nonminimal Derivative Coupling to Gravity