# Standard Siren Cosmology

Standard-siren cosmology jointly infers cosmological and compact-binary population parameters, and each change of galaxy catalogue, mass model or event set has usually meant a full reanalysis from the prior. ASPIRE fits a normalising flow to existing posterior samples and anneals them with sequential Monte Carlo toward the posterior under a new hypothesis, recovering posteriors consistent with nested sampling on GWTC-5.0 dark-siren cases while still estimating Bayesian evidence. Adding GLADE+ galaxy-catalogue information to a spectral-siren result cut sampling time from 134.4 hours to 4.6 hours.

Standard-siren cosmology jointly infers cosmological and compact-binary population parameters, and each change of galaxy catalogue, mass model or event set has usually meant a full reanalysis from the prior. ASPIRE fits a normalising flow to existing posterior samples and anneals them with sequential Monte Carlo toward the posterior under a new hypothesis, recovering posteriors consistent with nested sampling on GWTC-5.0 dark-siren cases while still estimating Bayesian evidence. Adding GLADE+ galaxy-catalogue information to a spectral-siren result cut sampling time from 134.4 hours to 4.6 hours.