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김별 ( Byeol Kim ),노수혁 ( Suhyeok Rho ),송현미 ( Hyunmi Song ) 충남대학교 기초과학연구원 2021 충남과학연구지 Vol.38 No.1
Albert Einstein predicted gravitational waves caused by the distortion of spacetime. Since the first detection of a gravitational wave signal by the Laser Interferometer Gravitational-wave Observatory (LIGO) on September 14, 2015, many more gravitational wave signals have been detected so far. To reveal the source of a gravitational wave signal, one needs to pin down a waveform model and its parameter set that reproduces best the observed signal through a Bayesian approach. However, such analyses can be complicated mainly due to (1) a huge variety of model choices (more than one hundred) and (2) the ambiguities in determining the priors of model parameters. In this study, we revisit the case of GW150914, the first-ever detection of a gravitational wave, with 27 models and different priors. By comparing the Bayesian evidences of the models, we have found that the best match to the observed signal comes from the model with relativistic effects taken into account. Among those without relativisitc effects two models of SEOBNRv2 and IMRPhenomX provide the most accurate description for the observed signal.