New constraint on cosmological variation of the proton-to-electron mass ratio from Q0528-250

Julian A. King, Michael T. Murphy, Wim Ubachs +1

Molecular hydrogen transitions in quasar spectra can be used to constrain variation in the proton-to-electron mass ratio, $\mu \equiv m_p/m_e$, at high redshifts ($z\gtrsim 2$). We pr…