Cardy-Verlinde entropy in Ho\v{r}ava-Lifshitz gravity

TL;DR

This paper explores the connection between Hořava-Lifshitz gravity and conformal field theory entropy, demonstrating how the Hamiltonian constraint relates to the Cardy formula and revealing insights into gravity's thermodynamic and holographic aspects.

Contribution

It shows that the Hamiltonian constraint in Hořava-Lifshitz cosmology can be expressed as the Cardy entropy formula, linking quantum gravity parameters to thermodynamic properties.

Findings

Cardy entropy depends explicitly on the Hořava parameter λ

Verlinde's Pythagorean relation holds in Hořava-Lifshitz spacetimes

Results suggest a deep link between gravity, thermodynamics, and holography

Abstract

We investigate homogeneous cosmological models with perfect-fluid sources in the framework of the Ho\v rava-Lifshitz model for quantum gravity. We show that the Hamiltonian constraint of such spacetimes can be rewritten as the Cardy formula for the entropy in conformal field theory. The Cardy entropy is shown to depend explicitly on the value of the Ho\v rava parameter $\lambda$ so that it can be interpreted as determining the entropy and the gravitational interaction of the theory. Moreover, we show that Verlinde's Pythagorean representation of the Hamiltonian constraint is also valid in the case of homogeneous Ho\v rava-Lifshitz spacetimes. We interpret these results as a further indication of a deep relationship between gravity, thermodynamics and holography in the quantum regime.