Can large black holes collide in de Sitter space-time? An inflationary scenario of an inhomogeneous universe

Tetsuya Shiromizu, Ken Ichi Nakao, Hideo Kodama, Kei Ichi Maeda

Research output: Contribution to journalArticle

35 Citations (Scopus)


We investigate black holes in asymptotically de Sitter space-times. We show that a trapped surface always appears inside the event horizon and the total area of the black holes does not decrease as in asymptotically flat space-times. We find, however, that there is an upper bound on the area of apparent horizons in a wide class of asymptotically de Sitter space-times, in contrast with asymptotically flat space-times. This implies that black holes with a large area cannot collide with each other in asymptotically de Sitter space-time, unless a naked singularity is formed. On the basis of these results we argue that the inflationary scenario works even for initially inhomogeneous universes.

Original languageEnglish
Pages (from-to)R3099-R3102
JournalPhysical Review D
Issue number8
Publication statusPublished - 1993 Jan 1


ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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