Statefinder parameters for interacting dark energy

TL;DR

This paper explores the use of statefinder parameters, which involve the third derivative of the cosmic scale factor, to characterize interacting quintessence dark energy models that address the coincidence problem.

Contribution

It specifies the statefinder parameters for two classes of interacting dark energy models that help solve or alleviate the coincidence problem.

Findings

Statefinder parameters effectively characterize interacting dark energy models.

Application to models that address the coincidence problem.

Provides a framework for distinguishing dark energy models.

Abstract

We argue that the recently introduced "statefinder parameters" (Sahni et al., JETP Lett. 77, 201 (2003)), that include the third derivative of the cosmic scale factor, are useful tools to characterize interacting quitessence models. We specify the statefinder parameters for two classes of models that solve, or at least alleviate, the coincidence problem.