Reconciling low multipole anomalies and reheating in single field inflationary models

TL;DR

This paper explores how features in the inflaton potential can link low multipole anomalies in the CMB with reheating parameters in single field inflation models, providing tighter constraints on the reheating phase.

Contribution

It demonstrates that potential features offer additional constraints on reheating parameters, improving the understanding of early universe dynamics in single field inflation models.

Findings

Reheating parameters are more constrained when considering low multipole anomalies.

Features in the inflaton potential can explain CMB anomalies and constrain reheating.

Compatibility with CMB anomalies narrows the reheating parameter space.

Abstract

Reheating phase of inflationary Universe can be modeled by parameters $T_{\text{reh}}$, $\bar{w}_{\text{reh}}$ and $N_{\text{reh}}$, which can be constrained by the scalar spectral amplitude $A_{s}$ and the scalar spectral index $n_{s}$. On the other hand the low multipole anomalies in the CMB can be modeled by suitable features in the inflaton potential. We show that the parameters of these features in the inflaton potential provide additional constraints on the reheating parameters. For several single field models we find that the reheating parameters are substantially more constrained by the requirement of compatibility with the proposed explanation for low multipole anomalies.