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arxiv: 1202.0719 · v1 · submitted 2012-02-03 · 🌀 gr-qc

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Making sense of the bizarre behaviour of horizons in the McVittie spacetime

Valerio Faraoni , Andres F. Zambrano Moreno , Roshina Nandra
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classification 🌀 gr-qc
keywords apparentbehaviourhorizonmcvittiespacetimebackgroundbizarreblack
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The bizarre behaviour of the apparent (black hole and cosmological) horizons of the McVittie spacetime is discussed using, as an analogy, the Schwarzschild-de Sitter-Kottler spacetime (which is a special case of McVittie anyway). For a dust-dominated "background" universe, a black hole cannot exist at early times because its (apparent) horizon would be larger than the cosmological(apparent) horizon. A phantom-dominated "background" universe causes this situation, and the horizon behaviour, to be time-reversed.

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