Leonardo Iampieri presented a new paper where we develop a novel strategy to study cosmic expansion with Gravitational Wave (GW) sources without an identified host galaxy but with an associated electromagnetic (EM) counterpart. We show that the relative time delay between the GW luminosity peak and the arrival of the EM counterpart can be used to measure the cosmic expansion and also fit the distribution of gamma-ray bursts prompt time delays.

Please, feel free to read our paper and reach out to us for any question or suggestion.

Figure: Posterior on the Hubble constant and mean and standard deviation of the GW-GRB prompt time delay distribution with 100 binary neutron star events.