Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-08-04
Phys.Rev.D72:044021,2005
Astronomy and Astrophysics
Astrophysics
17 pages, accepted for publication in Physical Review D, minor correction
Scientific paper
10.1103/PhysRevD.72.044021
We discuss a new class of solutions to the Einstein equations which describe a primordial black hole (PBH) in a flat Friedmann background. Such solutions arise if a Schwarzschild black hole is patched onto a Friedmann background via a transition region. They are possible providing the black hole event horizon is larger than the cosmological apparent horizon. Such solutions have a number of strange features. In particular, one has to define the black hole and cosmological horizons carefully and one then finds that the mass contained within the black hole event horizon decreases when it is larger than the Friedmann cosmological apparent horizon, although its area always increases. These solutions involve two distinct future null infinities and are interpreted as the conversion of a white hole into a black hole. Although such solutions may not form from gravitational collapse in the same way as standard PBHs, there is nothing unphysical about them, since all energy and causality conditions are satisfied. Their conformal diagram is a natural amalgamation of the Kruskal diagram for the extended Schwarzschild solution and the conformal diagram for a black hole in a flat Friedmann background. In this paper, such solutions are obtained numerically for a spherically symmetric universe containing a massless scalar field, but it is likely that they exist for more general matter fields and less symmetric systems.
Carr Bernard J.
Harada Tomohiro
No associations
LandOfFree
Super-horizon primordial black holes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Super-horizon primordial black holes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Super-horizon primordial black holes will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-613817