Cosmology with Gravitational Wave/Fast Radio Burst Associations

Understand

Recently, some theoretical models predicted that a small fraction of fast radio bursts (FRBs) could be associated with gravitational waves (GWs).

• In this work, we discuss the possibility of using GW/FRB association systems, if commonly detected in the future, as a complementary cosmic probe.
• We propose that upgraded standard sirens can be constructed from the joint measurements of luminosity distances $D_{L}$ derived from GWs and dispersion measures ${\rm DM_{IGM}}$ derived from FRBs (i.e., the combination $D_{L}\cdot{\rm DM_{IGM}}$).
• Moreover, unlike the traditional standard-siren approach (i.e., the $D_{L}$ method) and the $\rm DM_{IGM}$ method that rely on the optimization of the Hubble constant $H_0$, this $D_{L}\cdot{\rm DM_{IGM}}$ method has the advantage of being independent of $H_0$.