Theoretical Limits on the Equation-of-State Parameter of Phantom Cosmology

TL;DR

This paper explores quantum gravitational constraints on the equation-of-state parameter in phantom cosmology, revealing it is largely unrestricted and thus more robust as a dark energy model compared to quintessence.

Contribution

It demonstrates that quantum gravitational considerations do not restrict the phantom equation-of-state parameter across various models, unlike quintessence.

Findings

Phantom equation-of-state parameter is unrestricted by quantum gravity constraints.

Contrasts with quintessence, where constraints are more restrictive.

Supports robustness of phantom cosmology as a dark energy candidate.

Abstract

We investigate the restrictions on the equation-of-state parameter of phantom cosmology, due to the minimum quantum gravitational requirements. We find that for all the examined $w_\Lambda(z)$-parametrizations and for arbitrary phantom potentials and spatial curvature, the phantom equation-of-state parameter is not restricted at all. This is in radical contrast with the quintessence paradigm, and makes phantom cosmology more robust and capable of constituting the underlying mechanism for dark energy.