Thermodynamics and classification of cosmological models in the Horava-Lifshitz theory of gravity

TL;DR

This paper analyzes the thermodynamics and evolution of cosmological models within Horava-Lifshitz gravity, classifying various scenarios based on parameters and exploring phenomena like singularities and bouncing universes.

Contribution

It systematically classifies cosmological models in Horava-Lifshitz gravity and examines their thermodynamic properties and evolution, including singularities and bouncing solutions.

Findings

Identification of conditions for acceleration and deceleration phases.

Classification of models with big bang, big crunch, and big rip singularities.

Discovery of models that support bouncing universe scenarios.

Abstract

We study thermodynamics of cosmological models in the Horava-Lifshitz theory of gravity, and systematically investigate the evolution of the universe filled with a perfect fluid that has the equation of state $p=w\rho$, where $p$ and $\rho$ denote, respectively, the pressure and energy density of the fluid, and $w$ is an arbitrary real constant. Depending on specific values of the free parameters involved in the models, we classify all of them into various cases. In each case the main properties of the evolution are studied in detail, including the periods of deceleration and/or acceleration, and the existence of big bang, big crunch, and big rip singularities. We pay particular attention on models that may give rise to a bouncing universe.