Isolated Horizons with NUT Charge

Details Isolated Horizons with NUT Charge Isolated Horizons with NUT Charge

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apri12001w&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

Recent results of Hawking and Hunter argued for additional contributions to black hole entropy---besides the usual A/4---in the presence of NUT charge. Motivated by this, we investigate the mechanics of isolated horizons in a space of solutions to Einstein's equation with NUT charge. Within this framework, we find that additional terms arise in the first law due to the nontrivial topology. These terms are consistent with the first law obtained from variation of parameters within the two-dimensional Taub-NUT phase space, but do not have an obvious relation to the extra terms obtained by Hawking and Hunter. We are investigating whether these additional terms should be ascribed to the entropy, a work term, or a combination of the two.

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