Reheating constraints on Tachyon Inflation

Abstract

Tachyon inflation is one of the most attractive models of noncannonical inflation motivated by string theory. In this work we revisit the constraints on tachyon inflation with inverse $\cosh$ potential and exponential potential considering reheating, Although the phase of reheating is not well understood, it can be parameterized in terms of reheating temperature $T_{re}$, number of e-folds during reheating $N_{re}$ and effective equation of state during reheating $w_{re}$, which can be related to the parameters of the tachyon potential, spectral index $n_s$ and tensor-to-scalar ratio $r$. For various reheating scenarios there is a finite range of $w_{re}$ and the reheating temperature should be above electroweak scale. By imposing these conditions, we find that both the inverse $\cosh$ potential and exponential potential are disfavored by Planck observations. We also find that $w_{re}$ for both these potentials should be close to $1$ to satisfy Planck-2015 joint constraints on $n_s$ and $r$.

Updated with Planck-2018 and BICEP2/Keck Array-2015 data, Referee's comments incorporated, New references added, Accepted for publication in Phys.Rev.D

References in corpus (4)

• Reheating in Inflationary Cosmology: Theory and Applications
• Reheating constraints to inflationary models
• Reheating predictions in single field inflation
• Theoretical and observational constraints on Tachyon Inflation

Cited by in corpus (12)

• Inflation and Reheating in f(R,h) theory formulated in the Palatini formalism
• Measuring the Inflaton Coupling in the CMB
• LiteBIRD and CMB-S4 Sensitivities to Reheating in Plateau Models of Inflation
• Tachyon inflation in the holographic braneworld
• Energy Density, Temperature and Entropy Dynamics in Perturbative Reheating
• Variable Inflaton Equation of State and Reheating
• Reheating constraints on K-inflation
• Connecting Cosmic Inflation to Particle Physics with LiteBIRD, CMB-S4, EUCLID and SKA
• Reheating constraints to WIMPflation
• Study in the noncanonical domain of Goldstone inflation
• A possible solution to the Hubble tension from quantum gravity
• Viable Anisotropic Inflation and Reheating in the Tachyon Model