100 citations · 309 across the 7 of their papers we have counts for
7 papers
Constraints on changes in the proton-electron mass ratio using methanol lines
N. Kanekar, W. Ubachs, K. M. Menten +6
We report Karl G. Jansky Very Large Array (VLA) absorption spectroscopy in four methanol (CHOH) lines in the gravitational lens towards PKS1830-211. Three of the…
Limits on a Gravitational Field Dependence of the Proton--Electron Mass Ratio from H in White Dwarf Stars
Julija Bagdonaite, Edcel J. Salumbides, Simon P. Preval +4
Spectra of molecular hydrogen (H) are employed to search for a possible proton-to-electron mass ratio () dependence on gravity. The Lyman transitions of H, observed with…
Robust Constraint on a Drifting Proton-to-Electron Mass Ratio at z=0.89 from Methanol Observation at Three Radio Telescopes
Julija Bagdonaite, Mario Daprà, Paul Jansen +5
A limit on a possible cosmological variation of the proton-to-electron mass ratio is derived from methanol (CHOH) absorption lines in the benchmark PKS1830211 lensing ga…
Analysis of Molecular Hydrogen Absorption toward QSO B0642-5038 for a Varying Proton-to-Electron Mass Ratio
Julija Bagdonaite, Wim Ubachs, Michael T. Murphy +1
Rovibronic molecular hydrogen (H) transitions at redshift towards the background quasar B06425038 are examined for a possible cosmological variati…
The CO A-X System for Constraining Cosmological Drift of the Proton-Electron Mass Ratio
E. J. Salumbides, M. L. Niu, J. Bagdonaite +4
The band system of carbon monoxide, which has been detected in six highly redshifted galaxies (), is identified as a novel probe method t…
Constraint on a variation of the proton-to-electron mass ratio from H2 absorption towards quasar Q2348-011
Julija Bagdonaite, Michael T. Murphy, Lex Kaper +1
Molecular hydrogen (H2) absorption features observed in the line-of-sight to Q2348-011 at redshift zabs = 2.426 are analysed for the purpose of detecting a possible variation of th…
Search for cosmological mu variation from high redshift H2 absorption; a status report
Wim Ubachs, Julija Bagdonaite, Michael T. Murphy +2
Observations of H2 spectra in the line-of-sight of distant quasars may reveal a variation of the proton-electron mass ratio mu=m_p/m_e at high redshift, typically for z>2. Currentl…