Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2010-04-27
Phys.Rev.D82:124016,2010
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
12 pages, 8 figures.
Scientific paper
10.1103/PhysRevD.82.124016
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.
Kidder Lawrence E.
Mroué Abdul H.
Pfeiffer Harald P.
Teukolsky Saul A.
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