We present a reanalysis of 17 gravitational-wave events detected with
Advanced LIGO and Advanced Virgo in their first three observing runs, using the
new IMRPhenomTEHM model — a phenomenological time-domain multipolar waveform
model for aligned-spin black-hole binaries in elliptical orbits with two
eccentric parameters: eccentricity and mean anomaly. We also analyze all events
with the underlying quasi-circular model IMRPhenomTHM to study the impact of
including eccentricity and compare the eccentric and quasi-circular binary
hypotheses. The high computational efficiency of IMRPhenomTEHM enables us to
explore the impact of two different eccentricity priors — uniform and
log-uniform — as well as different sampler and data settings. We find evidence
for eccentricity in two publicly available LVK events, GW200129 and
GW200208_22, with Bayes factors favoring the eccentric hypothesis over the
quasi-circular aligned-spin scenario:
$\log_{10}\mathcal{B}_{\mathrm{E/QC}}\in\left[1.30^{+0.15}_{-0.15},
5.14^{+0.15}_{-0.15}\right]$ and
$\log_{10}\mathcal{B}_{\mathrm{E/QC}}\in\left[0.49^{+0.08}_{-0.08},
1.14^{+0.08}_{-0.08}\right]$, respectively. Additionally, the two high-mass
events GW190701 and GW190929 exhibit potential eccentric features. For all four
events, we conduct further analyses to study the impact of different sampler
settings. We also investigate waveform systematics by exploring the support for
spin precession using IMRPhenomTPHM and NRSur7dq4, offering new insights into
the formation channels of detected binaries. Our results highlight the
importance of considering eccentric waveform models in future observing runs,
alongside precessing models, as they can help mitigate potential biases in
parameter estimation studies. This will be particularly relevant with the
expected increase in the diversity of the binary black hole population with new
detectors.

Este artículo explora los viajes en el tiempo y sus implicaciones.

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