Cosmological thermodynamics and deflationary gas universe

Abstract

We establish a general thermodynamic scheme for cosmic fluids with internal self-interactions and discuss equilibrium and non-equilibrium aspects of such systems in connection with (generalized) symmetry properties of the cosmological dynamics. As an example we construct an exactly solvable gas dynamical model of a ``deflationary'' transition from an initial de Sitter phase to a subsequent Friedmann-Lema\^ıtre-Robertson-Walker (FLRW) period. We demonstrate that this dynamics represents a manifestation of a conformal symmetry of an ``optical'' metric, characterized by a specific effective refraction index of the cosmic medium.

12 pages, to appear in PRD

References in corpus (3)

• Cosmological particle production, causal thermodynamics, and inflationary expansion
• Inflationary cosmology with scalar field and radiation
• Thermodynamic equilibrium in the expanding universe

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• Cosmological consequences of a possible $\Lambda$-dark matter interaction
• Scalar field description of decaying-$\Lambda$ cosmologies
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• Topological defect solutions in the spherically symmetric space-time admitting conformal motion
• The Maxwell--Boltzmann gas with non-standard self--interactions: a novel approach to galactic dark matter
• Curvature Coupling and Accelerated Expansion of the Universe
• On homothetic cosmological dynamics
• The scalarized Raychaudhuri identity and its applications
• Nonlocal extension of causal thermodynamics of the isotropic cosmic fluid