23–24 Oct 2023
PHS1
Europe/Amsterdam timezone

Bayesian inference of binary black holes with inspiral-merger-ringdown waveforms using two eccentric parameters

23 Oct 2023, 16:30
15m
B0.001 (PHS1)

B0.001

PHS1

Maastricht University Faculty for Science and Engineering Paul-Henri-Spaaklaan 1
Talk Data Analysis Data Analysis

Speaker

Antoni Ramos-Buades (Nikhef)

Description

Orbital eccentricity is a crucial physical effect to unveil the origin of compact-object binaries detected by ground- and spaced-based gravitational-wave (GW) observatories. Here, we perform for the first time a Bayesian inference study of inspiral-merger-ringdown eccentric waveforms for binary black holes with non-precessing spins using two (instead of one) eccentric parameters: eccentricity and relativistic anomaly. We employ for our study the multipolar effective-one-body (EOB) waveform model SEOBNRv4EHM, and use initial conditions such that the eccentric parameters are specified at an orbit-averaged frequency. We show that this new parametrization of the initial conditions leads to a more efficient sampling of the parameter space. We also assess the impact of the relativistic-anomaly parameter by performing mock-signal injections, and we show that neglecting such a parameter can lead to significant biases in several binary parameters. We validate our model with mock-signal injections based on numerical-relativity waveforms, and we demonstrate the ability of the model to accurately recover the injected parameters. Finally, using standard stochastic samplers employed by the LIGO-Virgo-KAGRA Collaboration, we analyze a set of real GW signals observed by the LIGO-Virgo detectors during the first and third runs. We do not find clear evidence of eccentricity in the signals analyzed, more specifically we measure egw, 10HzGW150914=0.080.06+0.09, egw, 20HzGW151226=0.050.04+0.05, and egw, 5.5HzGW190521=0.150.12+0.12.

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