The spectral siren technique requires independent knowledge of binary black hole mass distributions at all redshifts to an accuracy better than the statistical uncertainty, or else the Hubble constant measurement is biased.
The binary black hole merger rate deviates from the cos- mic star formation rate: A tug of war between metallicity and delay times.The Astrophysical Journal, 976(1):23
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Blinded Mock Data Challenge: Is the Spectral Siren Technique Robust for Measuring the Hubble Constant?
The spectral siren technique requires independent knowledge of binary black hole mass distributions at all redshifts to an accuracy better than the statistical uncertainty, or else the Hubble constant measurement is biased.