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The photon mass, $m_\gamma$, can in principle be constrained usingmeasurements of the dispersion measures (DMs) of fast radio bursts (FRBs), oncethe FRB redshifts are known. The DM of the repeating FRB 121102 is known to $<1$\%, a host galaxy has now been identified with high confidence,and itsredshift, $z$, has now been determined with high accuracy: $z = 0.19273(8)$.Taking into account the plasma contributions to the DM from the Intergalacticmedium (IGM) and the Milky Way, we use the data on FRB 121102 to derive theconstraint $m_\gamma \lesssim 2.2 \times 10^{-14}$ eV c$^{-2}$ ($3.9 \times10^{-50}$ kg). Since the plasma and photon mass contributions to DMs havedifferent redshift dependences, they could in principle be distinguished bymeasurements of more FRB redshifts, enabling the sensitivity to $m_\gamma$ tobe improved.

FRB 121102 Casts New Light on the Photon Mass