(P)reheating Effects of a Constrained K\"ahler Moduli Inflation Model

TL;DR

This paper investigates a string-inspired inflation model coupled with a scalar field, analyzing its viability, parameter constraints, and potential gravitational wave signals detectable in high-frequency ranges.

Contribution

It provides the first detailed analysis of the reheating effects, parameter bounds, and gravitational wave predictions for the K"ahler Moduli Inflation I model with a non-zero minimum.

Findings

Model consistent with current CMB data

Predicted stochastic gravitational waves in 10^9-10^11 Hz range

Constraints on inflaton mass and reheating temperature

Abstract

In this talk, I discuss the effects, viability, and predictions of the string-theory-motivated K\"ahler Moduli Inflation I (KMII) potential, coupled to a light scalar field $\chi$, which can provide a possible source for today's dark energy density due to the potential's non-vanishing minimum. Although the model is consistent with the current measured Cosmic Microwave Background (CMB) data, tighter constraints from future observations are required to test the viability of the KMII potential with its minimum equivalent to the observed cosmological constant's energy density $\rho_{\Lambda_{\mathrm{obs}}}$. We implement a Markov Chain Monte Carlo (MCMC) sampling method to compute the allowed model parameter ranges and bounds on the inflaton's mass $m_{\phi}$ and reheating temperature $T_{\mathrm{reh}}$. Additionally, our lattice simulations predict stochastic gravitational-wave backgrounds generated during the inflaton oscillations that would be observable today in the $10^{9}$-$10^{11} \, \mathrm{Hz}$ frequency range. All the results and details will be included in our upcoming paper with the same title.