How many black holes fit on the head of a pin?

Frederik Denef, Gregory W. Moore

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The Bekenstein-Hawking entropy of certain black holes can be computed microscopically in string theory by mapping the elusive problem of counting microstates of a strongly gravitating black hole to the tractable problem of counting microstates of a weakly coupled D-brane system, which has no event horizon, and indeed comfortably fits on the head of a pin. We show here that, contrary to widely held beliefs, the entropy of spherically symmetric black holes can easily be dwarfed by that of stationary multi-black-hole "molecules" of the same total charge and energy. Thus, the corresponding pin-sized D-brane systems do not even approximately count the microstates of a single black hole, but rather those of a zoo of entropically dominant multicentered configurations.

Original languageEnglish (US)
Pages (from-to)1539-1544
Number of pages6
JournalGeneral Relativity and Gravitation
Volume39
Issue number10
DOIs
StatePublished - Oct 1 2007

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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