Observational evidence against a time variation in Planck's constant

Details Observational evidence against a time variation in Planck's constant Observational evidence against a time variation in Planck's constant

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...209..330s&link_type=abstract

Astrophysical Journal, vol. 209, Oct. 15, 1976, pt. 1, p. 330-334. Research supported by the Norges Almenvitenskapelige Forskni

Mathematics

Logic

13

Cosmology, Photons, Plancks Constant, Quasars, Red Shift, Astronomical Models, Galaxies, Light Speed, Photomultiplier Tubes, Time Dependence

Scientific paper

An attempt has been made to observe whether old photons have the same relation between wavelength and energy as young photons. No detectable difference was found, using quasars with redshift up to z = 1.6 as sources. Assuming that the speed of light is cosmologically constant, the observations give an upper limit for a hypothetical variation of Planck's constant of less than 1 part in 1 trillion per year in a reasonable cosmological model.

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