Smooth cosmological phase transition in the Horava-Lifshitz gravity

TL;DR

This paper demonstrates that in Horava-Lifshitz gravity, a smooth cosmological phase transition from early to late accelerated expansion is possible without detailed balance, under certain conditions involving negative dark scalar energy density.

Contribution

It introduces a model for cosmological phase transitions in HL gravity without detailed balance, highlighting conditions for smooth transitions and singularity avoidance.

Findings

Cosmological phase transition is achievable in HL gravity without detailed balance.

Negative dark scalar energy density enables smooth transition.

Existence of a minimum scale linked to singularity-free conditions.

Abstract

We show that the cosmological phase transition from the first accelerated expansion in the early universe to the second accelerated expansion over the intermediate decelerated expansion is possible in the HL gravity without the ``detailed balance'' condition if the dark scalar energy density is assumed to be negative. Moreover, we obtain various evolutions depending on the scale factor and the expansion rate. Finally, we discuss the existence of the minimum scale in connection with the singularity free condition.