Connecting inflation with late cosmic acceleration by particle production

TL;DR

This paper proposes a particle creation model linking inflation and late cosmic acceleration, explaining recent observations without modifying gravity by using continuous relativistic and non-relativistic particle production.

Contribution

It introduces a unified particle creation mechanism that accounts for both inflation and late acceleration, avoiding the need for modified gravity theories.

Findings

Model fits observational data well

Explains phantom-like dark energy behavior

Links early and late universe acceleration

Abstract

A continuous process of creation of particles is investigated as a possible connection between the inflationary stage with late cosmic acceleration. In this model, the inflationary era occurs due to a continuous and fast process of creation of relativistic particles, and the recent accelerating phase is driven by the non-relativistic matter creation from the gravitational field acting on the quantum vacuum, which finally results in an effective equation of state less than $-1$. Thus, explaining recent results in favor of a phantom dynamics without the need of any modifications in the gravity theory has been proposed. Finally, we confront the model with recent observational data of type Ia Supernova, history of the Hubble parameter, baryon acoustic oscillations, and the cosmic microwave background.