Browsing by Author "Ubachs, W"

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

    Bagdonaite, J; Salumbides, EJ; Preval, SP; Barstow, MA; Barrow, John David; Murphy, MT; Ubachs, W (American Physical SocietyPhysical Review Letters, 2014-09-18)
    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 ...

  • Probing the Gravitational Dependence of the Fine-Structure Constant from Observations of White Dwarf Stars 

    Bainbridge, M; Barstow, M; Reindl, N; Tchang-Brillet, W-Ü; Ayres, T; Webb, J; Barrow, John David; Hu, J; Holberg, J; Preval, S; Ubachs, W; Dzuba, V; Flambaum, V; Dumont, V; Berengut, J (Multidisciplinary Digital Publishing InstituteUniverse, 2017-06-01)
    Hot white dwarf stars are the ideal probe for a relationship between the fine-structure constant and strong gravitational fields, providing us with an opportunity for a direct observational test. We study a sample of hot ...