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Astrophysical Violations of the Kerr Bound as a Possible Signature of String Theory

In 4D general relativity, the angular momentum of a black hole is limited by the Kerr bound. We suggest that in string theory, this bound can be breached and compact black-hole-like objects can spin faster. Near such "superspinars," the efficiency of energy transfer from the accreting matter to radiation can reach 100%, compared to the maximum efficiency of 42% of the extremal Kerr (or 6% of the Schwarzschild) black hole. Finding such superspinning objects as active galactic nuclei, GBHCs, or sources of gamma ray bursts, could be viewed as experimental support for string theory.

preprint2007arXivOpen access
Eric G. GimonPetr Horava
astro-phhep-phhep-th
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Eric G. GimonPetr Horava

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