Limits on a Gravitational Field Dependence of the Proton--Electron Mass Ratio from H${}_2$ in White Dwarf Stars

Julija Bagdonaite, Edcel J. Salumbides, Simon P. Preval +4

Spectra of molecular hydrogen (H${}_2$) are employed to search for a possible proton-to-electron mass ratio ($\mu$) dependence on gravity. The Lyman transitions of H${}_2$, observed with…