Search for a drifting proton--electron mass ratio from H${}_2$

Wim Ubachs, Julija Bagdonaite, Edcel J. Salumbides +2

An overview is presented of the H${}_2$ quasar absorption method to search for a possible variation of the proton--electron mass ratio $\mu =m_p/m_e$ on a cosmological time scale. Detai…