Conformal symmetry and deflationary gas universe
Abstract
We describe the ``deflationary'' evolution from an initial de Sitter phase to a subsequent Friedmann-Lema\tre-Robertson-Walker (FLRW) period as a specific non-equilibrium configuration of a self-interacting gas. The transition dynamics corresponds to a conformal, timelike symmetry of an ``optical'' metric, characterized by a refraction index of the cosmic medium which continously decreases from a very large initial value to unity in the FLRW phase.
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