Thermodynamics and holography of tachyon cosmology

Abstract

Recently, we have investigated the dynamics of the universe in tachyon cosmology with nonminimal coupling to matter [1]- [5]. In particular, for the interacting holographic dark energy (IHDE), the model is studied in [6]. 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 ΛCDM 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.

Generalized holographic Ricci dark energy and generalized second law of thermodynamics in Bianchi Type I universe

“…Bhattacharya et al [67] consider two types of DE models, which are raised by Xu et al [34], and find that neither the first law of thermodynamics nor the GSLT is valid on the horizon of IR cutoff radius L. Moreover, Radicella and Pavón proved that the united dark fluid model could fulfill the GSLT, but its soundness is in doubt for the entropy's first and second derivatives present a rather peculiar and sharp oscillation [68]. More works about GSLT for the universe driven by HDE can be found in [69,70,71,72,73,74,75,76,77,78].…”