Revision of VLT/UVES constraints on a varying fine-structure constant

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  • 14 December 2006
Abstract
The two statistical studies of spectra from multiple heavy element transitions in quasar absorption systems report conflicting results on a varying fine-structure constant, alpha. Re-analysis of Srianand et al. [Phys. Rev. Lett. 92, 121302 (2004); also Chand et al., Astron. Astrophys. 417, 853 (2006)] reveals flawed parameter estimation methods. These caused errors to be underestimated by a factor of about 3 and may contribute to an existing strong bias in Delta(alpha)/alpha towards zero. Their spectra and absorption profile models actually imply a larger error and smaller alpha than their reported Delta(alpha)/(alpha)=(-0.06+/-0.06)x10^{-5}. Our revised value is (-0.44+/-0.16)x10^{-5} but we note that the published models may require detailed revision to derive a reliable measurement.

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