Consistent Constraints on the Equivalence Principle from localised Fast Radio Bursts

Understand

Fast Radio Bursts (FRBs) are short astrophysical transients of extragalactic origin.

• Their burst signal is dispersed by the free electrons in the large-scale-structure (LSS), leading to delayed arrival times at different frequencies.
• Another potential source of time delay is the well known Shapiro delay, which measures the space-space and time-time metric perturbations along the line-of-sight.
• If photons of different frequencies follow different trajectories, i.e.