Hubble tension and Reheating: Hybrid Inflation Implications

TL;DR

This paper proposes a hybrid inflation-based early Universe model with a phase transition that addresses the Hubble constant tension by fitting to Planck and SH0ES data, affecting reheating parameters.

Contribution

It introduces a novel hybrid inflation scenario involving a phase transition to explain H0 discrepancies, with implications for reheating parameters and constraints.

Findings

Model fits Planck and SH0ES data

Quantum fluctuations impact reheating parameters

New constraints on reheating parameters Nre and Tre

Abstract

We investigate a new possible solution to the Hubble constant tension. we propose a simple resolution to the problem assuming that a first-order phase transition related to H0 transition occurred in the early Universe. The early evolution of the Universe is a result of hybrid inflation that has lasted for a specific period until symmetry breaking takes place. Fitting our model to measurements from Planck and SH0ES data provides a key explanation of discrepancies of H0 measurements. The quantum fluctuations calculated in this model have significant results on the reheating parameters Nre and Tre. Therefore, new constraints must be taken into consideration to fit these parameters to recent results.