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On Universality of Ergoregion Mergers
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
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2009 (English)In: Classical and quantum gravity, ISSN 0264-9381, E-ISSN 1361-6382, Vol. 26, no 8Article in journal (Refereed) Published
Abstract [en]

We study mergers of ergoregions in d+1-dimensional vacuum gravity. At the merger point, where the ergosurfaces bounding each ergoregion just touch, solutions exhibit universal behavior when there is rotation only in one plane: the angle between the merging ergosurfaces depends only on the symmetries of the solution, not on any other details of the configuration. We show that universality follows from the fact that the relevant component of Einstein's equation reduces to Laplace equation at the point of merger. Thus ergoregion mergers mimic mergers of Newtonian equipotentials and have similar universal behavior. For solutions with rotation in more than one plane, universality is lost. We demonstrate universality and non-universality in several explicit examples.

Place, publisher, year, edition, pages
2009. Vol. 26, no 8
National Category
Subatomic Physics
Research subject
Theoretical Physics
URN: urn:nbn:se:uu:diva-196395DOI: 10.1088/0264-9381/26/8/085011OAI: oai:DiVA.org:uu-196395DiVA: diva2:610056
Available from: 2013-03-08 Created: 2013-03-08 Last updated: 2013-03-08

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