Cosmological model with variable vacuum pressure

Abstract

Scenarios of cosmological evolution having inflationary stages are studied by using equations of state (EoS) inspired by the quark bag model. A crucial point is the existence of states where the specific enthalpy of the cosmological fluid vanishes. A large class of barotropic EoS admits, depending upon initial conditions, for a concrete equation of state, analogs of the "Big Rip" as well as solutions describing an exponential inflation followed by the usual matter dominance. We found scalar field potentials that mimic the behavior of the cosmological scale factor in case of special EoS from the above class. Extensions to more general two-parametric EoS are discussed that describe a pre-inflationary evolution.

13 pages, 3 figures

References in corpus (4)

• Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests
• The new form of the equation of state for dark energy fluid and accelerating universe
• Planck Constraints on Holographic Dark Energy
• Equation of State of Dark Matter after Planck Data

Cited by in corpus (6)

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• A note on the relations between thermodynamics, energy definitions and Friedmann equations
• Thermodynamic behavior and stability of Polytropic gas
• Scalar field vs hydrodynamic models in the homogeneous isotropic cosmology
• Finite scale factor and future singularities
• Qualitative types of cosmological evolution in hydrodynamic models with barotropic equation of state