Probing variations in fundamental constants with radio and optical quasar absorption-line observations

@inproceedings{Tzanavaris2006ProbingVI,
  title={Probing variations in fundamental constants with radio and optical quasar absorption-line observations},
  author={Panayiotis Tzanavaris and Michael T. Murphy and John K. Webb and V. V. Flambaum and Stephen J. Curran},
  year={2006}
}
Nine quasar absorption spectra at 21-cm and UV rest-wavelengths are used to estimate possible variations in x ≡ αgpμ, where α is the fine structure constant, gp the proton g-factor and μ ≡ me/mp is the electron-to-proton mass ratio. We find 〈∆x/x〉 weighted total = (0.63 ± 0.99) × 10 over a redshift range 0.23 ∼ < zabs ∼ < 2.35 which corresponds to look-back times of 2.7–10.5 billion years. A linear fit against look-back time, tied to ∆x/x = 0 at z = 0, gives a best-fit rate of change of ẋ/x… CONTINUE READING