Phantom solution in a non-linear Israel-Stewart theory

Abstract

In this paper we present a phantom solution with a big rip singularity in a non-linear regime of the Israel-Stewart formalism. In this framework it is possible to extend this causal formalism in order to describe accelerated expansion, where assumption of near equilibrium is no longer valid. We assume a flat universe filled with a single viscous fluid ruled by a barotropic EoS, $p=\omega \rho$, which can represent a late time accelerated phase of the cosmic evolution. The solution allows to cross the phantom divide without evoking an exotic matter fluid and the effective EoS parameter is always lesser than $-1$ and constant in time.

18 pages and 6 figures. Published version in PLB

References in corpus (5)

• Dark Matter and Dark Energy Interactions: Theoretical Challenges, Cosmological Implications and Observational Signatures
• Dissipative generalized Chaplygin gas as phantom dark energy
• Crossing the phantom divide with dissipative normal matter in the Israel-Stewart-Hiscock formalism
• Nonlinear bulk viscosity and the stability of accelerated expansion in FRW spacetime
• Constraining a bulk viscous matter-dominated cosmological model using SNe Ia, CMB and LSS

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