[1004.4697] Measuring orbital eccentricity and periastron advance in quasi-circular black hole simulations

Authors: Abdul H. Mroué, Harald P. Pfeiffer, Lawrence E. Kidder, Saul A. Teukolsky

Date: 27 Apr 2010

Abstract: We compare different methods of computing the orbital eccentricity of quasi-circular binary black hole systems using the orbital variables and gravitational wave phase and frequency. For eccentricities of about a per cent, most methods work satisfactorily. For small eccentricity, however, the gravitational wave phase allows a particularly clean and reliable measurement of the eccentricity. Furthermore, we measure the decay of the orbital eccentricity during the inspiral and find reasonable agreement with post-Newtonian results. Finally, we measure the periastron advance of non-spinning binary black holes, and we compare them to post-Newtonian approximations. With the low uncertainty in the measurement of the periastron advance, we positively detect deviations between fully numerical simulations and post-Newtonian calculations.

abs pdf

Apr 29, 2010

1004.4697 (/preprints)
2010-04-29, 10:01 [edit]


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