A Precision Test for an Extra Spatial Dimension Using BlackholePulsar Binaries
Abstract
We discuss the observable effects of enhanced black hole mass loss in a black holeneutron star (BHNS) binary, due to the presence of a warped extra spatial dimension of curvature radius L in the braneworld scenario. For some masses and orbital parameters in the expected ranges the binary components would outspiral—the opposite of the behavior due to energy loss from gravitational radiation alone. If the NS is a pulsar, observations of the rate of change of the orbital period with a precision obtained for the binary pulsar B1913+16 could easily detect the effect of mass loss. For M _{BH} = 7 M _{sun}, M _{NS} = 1.4 M _{sun}, eccentricity e = 0.1, and L = 10 μm, the critical orbital period dividing systems that inspiral from systems that outspiral is P ≈ 6.5 hr, which is within the range of expected orbital periods; this value drops to P ≈ 4.2 hr for M _{BH} = 5 M _{sun}. Observations of a BHpulsar system could set considerably better limits on L in these braneworld models than could be determined by torsionbalance gravity experiments in the foreseeable future.
 Publication:

The Astrophysical Journal
 Pub Date:
 August 2011
 DOI:
 10.1088/20418205/737/2/L28
 arXiv:
 arXiv:1010.5245
 Bibcode:
 2011ApJ...737L..28S
 Keywords:

 binaries: close;
 black hole physics;
 gravitation;
 pulsars: general;
 Astrophysics  High Energy Astrophysical Phenomena;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Phenomenology;
 High Energy Physics  Theory
 EPrint:
 4 pages