Horizons in matter: black hole hair vs. Null Big Bang

Details Horizons in matter: black hole hair vs. Null Big Bang Horizons in matter: black hole hair vs. Null Big Bang

2009-05-27

arxiv.org/abs/0905.4425v1

Int.J.Mod.Phys.D18:2283-2287,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, essay written for the Gravity Research Foundation 2009 Awards for Essays on Gravitation, awarded a honorable mention

Scientific paper

10.1142/S0218271809015898

It is shown that only particular kinds of matter (in terms of the "radial" pressure to density ratio $w$) can coexist with Killing horizons in black-hole or cosmological space-times. Thus, for arbitrary (not necessarily spherically symmetric) static black holes, admissible are vacuum matter ($w=-1$, i.e., the cosmological constant or some its generalization) and matter with certain values of $w$ between 0 and -1, in particular, a gas of disordered cosmic strings ($w=-1/3$). If the cosmological evolution starts from a horizon (the so-called Null Big Bang scenarios), this horizon can co-exist with vacuum matter and certain kinds of phantom matter with $w\geq -3$. It is concluded that normal matter in such scenarios is entirely created from vacuum.

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