2005年5月
Upper limits on the size of a primordial black hole
PHYSICAL REVIEW D
- ,
- 巻
- 71
- 号
- 10
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevD.71.104009
- 出版者・発行元
- AMER PHYSICAL SOC
We provide precise constraints on the size of any black holes forming in the early Universe for a variety of formation scenarios. In particular, we prove that the size of the apparent horizon of a primordial black hole formed by causal processes in a flat Friedmann universe is considerably smaller than the cosmological apparent horizon size for an equation of state p = k rho (1/3 < k < 1). This also applies for a stiff equation of state (k = 1) or for a massless scalar field. The apparent horizon of a primordial black hole formed through hydrodynamical processes is also considerably smaller than the cosmological apparent horizon for 0 < k <= 1. We derive an expression for the maximum size which an overdense region can have without being a separate closed universe rather than part of our own. Newtonian argument shows that a black hole smaller than the cosmological horizon can never accrete much.
- リンク情報
- ID情報
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- DOI : 10.1103/PhysRevD.71.104009
- ISSN : 1550-7998
- Web of Science ID : WOS:000229440400045