Oleg Y. Gnedin et al 2009 ApJ 705 L168 doi:10.1088/0004-637X/705/2/L168
SHRINKING THE BRANEWORLD: BLACK HOLE IN A GLOBULAR CLUSTER
FREE ISSUEOleg Y. Gnedin1, Thomas J. Maccarone2, Dimitrios Psaltis3 and Stephen E. Zepf4
Show affiliationsLarge extra dimensions have been proposed as a possible solution to the hierarchy problem in physics. In one of the suggested models, the RS2 braneworld model, black holes may evaporate by Hawking radiation faster than in general relativity, on a timescale that depends on the black hole mass and on the asymptotic radius of curvature of the extra dimensions. Thus the size of the extra dimensions can be constrained by astrophysical observations. Here we point out that the black hole, recently discovered in an extragalactic globular cluster, places the strongest upper limit on the size of the extra dimensions in the RS2 model, L 
0.003 mm. This black hole has the virtues of old age and relatively small mass. The derived upper limit is within an order of magnitude of the absolute limit afforded by astrophysical observations of black holes.
- Keywords
- PACS
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98.20.Jp Globular clusters in external galaxies
98.62.Js Galactic nuclei (including black holes), circumnuclear matter, and bulges
- Subjects
- Dates
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Issue 2 (2009 November 10)
Received 2009 June 29, accepted for publication 2009 September 23
Published 2009 October 22
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Shrinking the Braneworld: Black Hole in a Globular Cluster
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