Relatore
Descrizione
The multi-messenger detection of the binary neutron star merger GW170817 on August 17, 2017, marks the birth of gravitational-wave (GW) cosmology. GW sources are self-calibrating standard sirens; from their detection, it is possible to directly estimate the luminosity distance of the source. If provided with a redshift estimate, as in the case of GW170817 through spectroscopy of its host galaxy, GWs can be used to probe cosmic expansion. After four observing runs and almost 10 years later, GW170817 remains the only GW source with an identified host galaxy, thanks to its electromagnetic counterpart. In contrast, a few hundred dark sirens, mostly binary black holes, have been observed. In analogy with standard candles, we have recently learned how to calibrate the redshift of dark sirens using galaxy surveys, as well as astrophysical knowledge of the possible formation channels of binary black holes.
In this talk, I will present what we have achieved in GW cosmology over the last ten years. I will review the impact of the only bright siren, GW170817, as well as the continuous efforts to calibrate the population of dark sirens currently observed by ground-based GW detectors.
| Sessione | Onde Gravitazionali e astronomia multimessaggera |
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