I see more reports about dark sirens out. The Call of Dark Sirens in Precision Cosmology,
https://ui.adsabs.harvard.edu/abs/2021nova.pres.7614K/abstract, Feb-2021. The NASA ADS Abstract report states "...Right now, our gravitational-wave technology isnt quite good enough to identify a precise value of H0. This problem is rooted in two issues: the large uncertainty on the measured distance luminosity in the gravitational-wave signal, and the difficulty in accurately identifying the host galaxy of a black hole merger, which produces no electromagnetic counterpart. But theres hope! Future advancements in technology at gravitational-wave detectors may soon bring these precise measurements into reach, according to the calculations of a team of scientists led by Ssohrab Borhanian (Pennsylvania State University)."
My observation. See 'Dark sirens' could solve one of the greatest mysteries in cosmology,
https://www.livescience.com/dark-sirens-resolve-hubble-tension.html, 12-April-2021. "A team has offered a way for gravitational wave events called dark sirens to resolve a crisis in cosmology" My observation. Using H0 = 73 km/s/Mpc reduces the age of the universe or Hubble time in the Cosmology Calculators,
http://www.astro.ucla.edu/~wright/CosmoCalc.html or
https://www.kempner.net/cosmic.php. H0= 67 km/s/Mpc and z = 0, age of universe = 13.8299e+9 years old. H0=73 and z = 0, 12.7008E+9 years old. The main calculators are
https://ned.ipac.caltech.edu/help/cosmology_calc.html Cosmology Calculator II using z=0, H0=73, age of universe 12.86E+9 years old, the Hubble time.
What does reducing the age of the universe do in cosmology and astronomy? Globular clusters are dated older, including some stars dated via Uranium-Thorium methods so there will be stars and clusters, older than the age calculated for the *beginning*
This problem has been there since H0 = 500 km/s/Mpc reported in the 1920s-1930s. Transparency is needed here.
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