3 papers
astro-ph.CO2026
Improved constraint on the Hubble constant from dark sirens with LIGO/Virgo/KAGRA O4a
V. Alfradique, C. R. Bom, G. Teixeira +1
A new measurement of the Hubble constant is presented using the statistical dark siren method applied to a sample of seven well-localized gravitational-wave (GW) events from…
astro-ph.HE2025
Multi-wavelength analysis of the progenitor of GRB 230307A via Bayesian model comparison
V. Alfradique, R. da Mata, J. C. RodrÃguez-RamÃrez +1
GRB 230307A is one of the brightest long-duration gamma-ray bursts (GRBs) ever detected, yet its progenitor remains uncertain due to the variety of plausible astrophysical scenario…
astro-ph.CO2025
Systematic bias in dark siren statistical methods and its impact on Hubble constant measurement
V. Alfradique, C. R. Bom, T. Castro
The advent of multimessenger cosmology, marked by the detection of GW170817, demonstrated that standard sirens are a valuable cosmological probe. In the absence of an electromagnet…