Do recent observations favor a cosmological event horizon: A thermodynamical prescription?

TL;DR

This paper investigates whether recent observations of the universe's accelerating expansion support the idea that a cosmological event horizon is thermodynamically favored, emphasizing equilibrium thermodynamics in cosmology.

Contribution

It demonstrates that the thermodynamics of the universe with an event horizon aligns with dark energy models under equilibrium conditions, supporting the horizon's physical relevance.

Findings

Universal thermodynamics with event horizon is favored by dark energy.

Equilibrium thermodynamical conditions are satisfied for the universe with an event horizon.

Supports the physical significance of the event horizon in accelerating universe models.

Abstract

Recent observational evidences claim an accelerating expansion of the universe at present epoch. It is commonly incorporated in standard cosmology by the introduction of an exotic matter (that violates the strong energy condition) known as dark energy (DE). As event horizon exists for accelerating universe so there has been a lot of work on universal thermodynamics (i.e., thermodynamics of the universe bounded by apparent or event horizon). Recently, thermodynamical equilibrium has been examined for both the horizons. In the present work we show that universal thermodynamics with event horizon is favored by DE from the point of view of equilibrium thermodynamical prescription.