# Reheating constraints in quintessential inflation

## TL;DR

This paper investigates how different reheating mechanisms in quintessential inflation models affect their viability, constraining reheating temperatures to specific ranges to match observational data.

## Contribution

It analyzes reheating constraints in quintessential inflation, identifying viable temperature ranges for heavy massive and massless particle production scenarios.

## Key findings

- Reheating via heavy particles requires temperatures between 1 GeV and 10^4 GeV.
- Reheating via massless particles is viable only if nearly conformally coupled, with temperatures from 1 MeV to 10^4 GeV.
- Models are consistent with current observational data within these temperature ranges.

## Abstract

We study the consequences of reheating in quintessential inflation. From simple inflationary quintessential models introduced in cite{hap, hap2}, we show that when the reheating is due to the production of heavy massive particles conformally coupled with gravity, a viable model which matches with the current observational data cite{Ade, Planck, bicep2} is only possible for reheating temperatures that range between $1$ GeV and $10^4$ GeV. On the other hand, when the universe reheats via the production of massless particles, the viability of the model is only possible when those particles are nearly conformally coupled with gravity, leading to a reheating temperature between $1$ MeV and $10^4$ GeV.