Matter creation, adiabaticity and phantom behavior

TL;DR

This paper introduces a new cosmological model linking matter creation, thermodynamics, and horizon entropy to explain accelerated universe expansion without exotic physics.

Contribution

It presents a unique matter creation mechanism derived from thermodynamic principles that produces phantom-like expansion with a single fluid component.

Findings

Derives a specific particle creation rate from thermodynamic laws.

Achieves phantom-like cosmic expansion without exotic matter.

Provides a thermodynamic explanation for dark energy phenomena.

Abstract

We present a novel cosmological framework that unifies matter creation dynamics with thermodynamic principles. Starting with a single-component fluid characterized by a constant equation of state parameter, $\omega$, we introduce a generalized second law of thermodynamics by considering the entropy associated with the cosmic horizon. Imposing an adiabatic expansion condition uniquely determines the particle creation rate, $\Gamma$, a feature unprecedented in previous matter creation models. This mechanism yields a cosmology featuring phantom-like expansion while relying solely on a single constituent, which can be either a quintessence-like fluid or a non-exotic, non-relativistic dark matter component. Remarkably, this framework avoids the need for exotic physics while providing a consistent explanation for the accelerated expansion of the universe. Our results open new pathways for understanding the interplay between horizon thermodynamics, particle creation, and cosmic evolution, offering fresh insights into the nature of dark energy and its potential thermodynamic origins.