Matching radiation-dominated and matter-dominated Einstein-de Sitter universes and an application for primordial black holes in evolving cosmological backgrounds

Mathematics – Logic

Scientific paper

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Einstein&Ndash, De Sitter Universes, Spacetime Matchings, Cosmological Black Holes, Primordial Black Holes

Scientific paper

By matching across a surface of constant time, it is demonstrated that the spacetime for a radiation-dominated Einstein-de Sitter universe can be directly matched to the spacetime for a matter-dominated Einstein-de Sitter universe. Thus, this can serve as a model of a universe filled with radiation that suddenly is converted to matter and antimatter, or a universe filled with matter and antimatter that suddenly annihilates to leave radiation. This matching is shown to hold for asymptotically Einstein-de Sitter cosmological black hole spacetimes, yielding simplistic models of primordial black holes that evolve between being in radiation-dominated universes and matter-dominated universes.

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