No gravitational-wave signal from ultralight vector boson clouds was found around two merger remnants or Cygnus X-1; masses [0.85, 1.59]x10^-13 eV are excluded for Cygnus X-1 at 95% confidence assuming initial spin above 0.5.
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Directed searches for gravitational waves from ultralight vector boson clouds around merger remnant and galactic black holes during the first part of the fourth LIGO-Virgo-KAGRA observing run
No gravitational-wave signal from ultralight vector boson clouds was found around two merger remnants or Cygnus X-1; masses [0.85, 1.59]x10^-13 eV are excluded for Cygnus X-1 at 95% confidence assuming initial spin above 0.5.