On Scaling Solutions with a Dissipative Fluid

TL;DR

This paper investigates the conditions under which stable accelerating solutions exist in dissipative fluid models, emphasizing the importance of the chosen equations of state for explaining the energy coincidence problem.

Contribution

It clarifies the dependence of stable accelerating attractors on specific equations of state, challenging recent claims and providing a nuanced understanding of dissipative fluid dynamics.

Findings

Existence of stable accelerating solutions depends on the equation of state.

Contradicts recent claims that such solutions are always present.

Supports the view that equations of state are crucial for cosmological models.

Abstract

We study the asymptotic behaviour of scaling solutions with a dissipative fluid and we show that, contrary to recent claims, the existence of stable accelerating attractor solution which solves the `energy' coincidence problem depends crucially on the chosen equations of state for the thermodynamical variables. We discuss two types of equations of state, one which contradicts this claim, and one which supports it.