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astro-ph.CO2025
Clustering effects on the Dark Siren determination of : A simulation study
Marios Kalomenopoulos, Riccardo Barbieri, Sadegh Khochfar +2
Gravitational waves (GWs) offer an alternative way to measure the Hubble parameter. The optimal technique, the ``bright siren'' approach, requires the identification of an electrom…
astro-ph.CO2025
Massive black holes or stars first: the key is the residual cosmic electron fraction
Muhammad A. Latif, Sadegh Khochfar
Recent James Webb Space Telescope observations have unveiled that the first supermassive black holes (SMBHs) were in place at z 10, a few hundred Myrs after the Big Bang. Th…