Highly Accurate H2 Lyman and Werner Band Laboratory Measurements and an Improved Constraint on a Cosmological Variation of the Proton-to-Electron Mass Ratio

Details Highly Accurate H2 Lyman and Werner Band Laboratory Measurements and an Improved Constraint on a Cosmological Variation of the Proton-to-Electron Mass Ratio Highly Accurate H2 Lyman and Werner Band Laboratory Measurements and an Improved Constraint on a Cosmological Variation of the Proton-to-Electron Mass Ratio

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phrvl..92j1302u&link_type=abstract

Physical Review Letters, vol. 92, Issue 10, id. 101302

Mathematics

Logic

39

Observational Cosmology, Protons And Neutrons, Vacuum Ultraviolet Spectra, Intergalactic Matter, Quasar Absorption And Emission-Line Systems, Lyman Forest

Scientific paper

Transition wavelengths on a large set of H2 Lyman and Werner band spectral lines have been obtained at an accuracy of 5×10-8, using a narrow band tunable extreme ultraviolet laser. The data are used to determine a constraint on a possible cosmological variation of the proton-to-electron mass ratio (μ=Mp/me) from a comparison with highly redshifted spectral data of quasistellar objects, yielding a fractional change in the mass ratio of Δμ/μ=-0.5±3.6×10-5 (2σ), which would correspond to a temporal change of d/dt(Δμ/μ)=-0.4±3.0×10-15 per year (2σ) if a linear cosmological expansion model is assumed.

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