HORIZONS IN MATTER: BLACK HOLE HAIR VERSUS NULL BIG BANG
HORIZONS IN MATTER: BLACK HOLE HAIR VERSUS NULL BIG BANG
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 spaceātimes. Thus, for arbitrary (not necessarily spherically symmetric) static black holes, admissible are vacuum matter (w = ā1, i.e. the cosmological constant or ā¦