A String-Inspired Quintom Model Of Dark Energy

Abstract

We propose in this paper a quintom model of dark energy with a single scalar field $\varphi$ given by the lagrangian $\mathcal{L}=-V(\varphi )\sqrt{1-{\alpha }^{\prime }{\nabla }_{\mu }\varphi {\nabla }^{\mu }\varphi +{\beta }^{\prime }\varphi \square \varphi }$. In the limit of ${\beta }^{\prime }\to$0 our model reduces to the effective low energy lagrangian of tachyon considered in the literature. We study the cosmological evolution of this model, and show explicitly the behaviors of the equation of state crossing the cosmological constant boundary.

6 pages, 4 figures, accepted by PLB

References in corpus (2)

• Cosmological Evolution of a Quintom Model of Dark Energy
• Can dark energy evolve to the Phantom?

Cited by in corpus (13)

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• Holographic dark energy in a cyclic universe
• Thermodynamical Interpretation of the Interacting Holographic Dark Energy Model in a non-flat Universe
• Primordial perturbation with a modified dispersion relation
• Inflationary universe in loop quantum cosmology
• Crossing the phantom divide in an interacting generalized Chaplygin gas
• Gauss-Bonnet Chameleon Mechanism of Dark Energy
• Reconstructing a String-Inspired Quintom Model of Dark Energy
• Null Energy Condition and Dark Energy Models
• Unification of cosmological scalar fields