Comment on "limits on the time variation of the electromagnetic fine-structure constant in the low energy limit from absorption lines in the spectra of distant quasars.".

@article{Murphy2008CommentO,
  title={Comment on "limits on the time variation of the electromagnetic fine-structure constant in the low energy limit from absorption lines in the spectra of distant quasars.".},
  author={Michael Murphy and John K Webb and Victor V. Flambaum},
  journal={Physical review letters},
  year={2008},
  volume={100 2},
  pages={
          2 p following 029902
        }
}
A Comment on the Letter by R. Srianand et al., [Phys. Rev. Lett. 92, 121302 (2004)]. The authors of the Letter offer a Reply. 
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Limits on the time variation of the electromagnetic fine-structure constant in the low energy limit from absorption lines in the spectra of distant quasars.
TLDR
A detailed many-multiplet analysis performed on a new sample of Mg ii systems observed in high quality quasar spectra obtained using the Very Large Telescope finds that it is the time variation of alpha that forms the strongest constraint obtained based on high redshift quasar absorption line systems. Expand
Probing the cosmological variation of the fine - structure constant: Results based on VLT - UVES sample
Development of fundamental physics relies on the constancy of various fundamental quantities such as the fine- structure constant. Detecting or constraining the possible time variations of theseExpand
Constraining variations in the fine-structure constant, quark masses and the strong interaction
We present evidence for variations in the fine-structure constant from Keck/HIRES spectra of 143 quasar absorption systems over the redshift range 0.2 1.8). Our most robust estimate is a weightedExpand
Further evidence for a variable fine-structure constant from Keck/HIRES QSO absorption spectra
We have previously presented evidence for a varying fine-str ucture constant, α, in two independent samples of Keck/HIRES QSO absorption spectra. Here we present a detailed manymultiplet analysis ofExpand
SEARCH FOR TIME VARIATION OF THE FINE STRUCTURE CONSTANT
An order of magnitude sensitivity gain is described for using quasar spectra to investigate possible time or space variation in the fine structure constant $\ensuremath{\alpha}$. Applied to a sampleExpand
Fluctuations in the latter indicate failings in the minimization. Points and error bars indicate best-fitting values and 1-uncertainties; for our curves = was a free parameter