Tests of General Relativity with GW150914
Abstract
The LIGO detection of GW150914 provides an unprecedented opportunity to study the twobody motion of a compactobject binary in the largevelocity, highly nonlinear regime, and to witness the final merger of the binary and the excitation of uniquely relativistic modes of the gravitational field. We carry out several investigations to determine whether GW150914 is consistent with a binary blackhole merger in general relativity. We find that the final remnant's mass and spin, as determined from the lowfrequency (inspiral) and highfrequency (postinspiral) phases of the signal, are mutually consistent with the binary blackhole solution in general relativity. Furthermore, the data following the peak of GW150914 are consistent with the leastdamped quasinormal mode inferred from the mass and spin of the remnant black hole. By using waveform models that allow for parametrized generalrelativity violations during the inspiral and merger phases, we perform quantitative tests on the gravitationalwave phase in the dynamical regime and we determine the first empirical bounds on several highorder postNewtonian coefficients. We constrain the graviton Compton wavelength, assuming that gravitons are dispersed in vacuum in the same way as particles with mass, obtaining a 90%confidence lower bound of 10^{13} km . In conclusion, within our statistical uncertainties, we find no evidence for violations of general relativity in the genuinely strongfield regime of gravity.
 Publication:

Physical Review Letters
 Pub Date:
 June 2016
 DOI:
 10.1103/PhysRevLett.116.221101
 arXiv:
 arXiv:1602.03841
 Bibcode:
 2016PhRvL.116v1101A
 Keywords:

 General Relativity and Quantum Cosmology
 EPrint:
 17 pages, 8 Figures