[0912.4744] Constraining the braneworld with gravitational wave observations

Authors: Sean T. McWilliams

Date: 23 Dec 2009

Abstract: Braneworld models containing large extra dimensions may have observable consequences that, if detected, would validate a requisite element of string theory. In the infinite Randall-Sundrum model, the asymptotic AdS radius of curvature of the extra dimension supports a single bound state of the massless graviton on the brane, thereby avoiding gross violations of Newton's law. However, one possible consequence of this model is an enormous increase in the amount of Hawking radiation emitted by black holes. This consequence has been employed by other authors to attempt to constrain the AdS radius of curvature through the observation of black holes. I present two novel methods for constraining the AdS curvature. The first method results from the effect of this enhanced mass loss on the event rate for extreme mass ratio inspirals (EMRIs) detected by the space-based LISA interferometer. The second method results from the observation of an individually resolvable galactic black hole binary with LISA. I show that the EMRI event rate can constrain the asymptotic AdS radius of curvature, L, at the O(1 micron) level, and the detection of a single galactic black hole binary results in a constraint of L <= 2 microns. While both constraints are comparable to the most stringent result in the literature, the limit derived from observing a galactic binary does not depend on any auxiliary assumptions, such as the age of the constituent black holes, and should therefore provide a robust limit on the achievable constraint from the observation of gravitational wave sources with LISA.

abs pdf

Jan 09, 2010

0912.4744 (/preprints)
2010-01-09, 13:53 [edit]

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