Journal
EPL
Volume 94, Issue 5, Pages -Publisher
EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
DOI: 10.1209/0295-5075/94/50002
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Funding
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- JSPS [22740147]
- Grants-in-Aid for Scientific Research [22740147] Funding Source: KAKEN
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Nowadays we believe that a typical galaxy contains about 10(7) stellar-mass black holes and a single super-massive black hole at its center. According to general relativity, these objects are characterized solely by their mass M and by their spin parameter a(*). A fundamental limit for a black hole in general relativity is the Kerr bound vertical bar a(*)vertical bar <= 1, but the accretion process can spin it up to a(*) approximate to 0.998. If a compact object is not a black hole, the Kerr bound does not hold and in this letter I provide some evidences suggesting that the accretion process could spin the body up to a(*) > 1. While this fact should be negligible for stellar-mass objects, some of the super-massive objects at the center of galaxies may actually be super-spinning bodies exceeding the Kerr bound. Such a possibility can be tested by gravitational wave detectors like LISA or by sub-millimeter very long-baseline interferometry facilities. Copyright (C) EPLA, 2011
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