Gravitational waves have been used to measure the Hubble constant before, but the uncertainties were too large to provide competitive constraints. However, using lensed gravitational wave events could be a game-changer.
Half of the 2019 Nobel Prize in Physics was awarded to James Peebles for his work in physical cosmology. Come read about some of his contributions that led to this recognition!
With an ideal dataset of many localized FRBs, how can the diffuse gas fraction in the IGM be constrained?
The field of cosmology just can’t seem to agree on a value of the Hubble constant, so astrophysicists attempt to provide a new, independent measurement using strong gravitational lensing.