Thermodynamics and holography of tachyon cosmology

TL;DR

This paper explores the thermodynamic properties of tachyon cosmology with holographic dark energy, showing it fits observational data better than Lambda-CDM and satisfies thermodynamic laws on the apparent horizon.

Contribution

It investigates the thermodynamics of holographic tachyon cosmology with observational constraints, confirming the validity of thermodynamic laws and predicting cosmic acceleration.

Findings

IHDE model fits observational data better than Lambda-CDM.

Thermodynamic laws hold on the apparent horizon.

Current cosmic acceleration is supported by the model.

Abstract

Recently, we have investigated the dynamics of the universe in tachyon cosmology with non-minimal coupling to matter \cite{faraj}-\cite{faraj3}. In particular, for the interacting holographic dark energy (IHDE), the model is studied in \cite{Ravanpak}. In the current work, a significant observational program has been conducted to unveil the model's thermodynamic properties. Our result shows that the IHDE version of our model better fits the observational data than $\Lambda$CDM model. The first and generalized second thermodynamics laws for the universe enveloped by cosmological apparent and event horizon are revisited. From the results, both first and generalized second laws, constrained by the observational data, are satisfied on cosmological apparent horizon.In addition, the total entropy is verified with the observation only if the horizon of the universe is taken as apparent horizon. Then, due to validity of generalized second law, the current cosmic acceleration is also predicted.