Search Publications

Limits on a Gravitational Field Dependence of the Proton-Electron Mass Ratio from H₂ in White Dwarf Stars

Barstow, M. A.; Bagdonaite, J.; Salumbides, E. J. +4 more

Spectra of molecular hydrogen (H₂) are employed to search for a possible proton-to-electron mass ratio (µ) dependence on gravity. The Lyman transitions of H₂, observed with the Hubble Space Telescope towards white dwarf stars that underwent a gravitational collapse, are compared to accurate laboratory spectra taking int…