WMAP constraints on varying α and the promise of reionization

  title={WMAP constraints on varying α and the promise of reionization},
  author={C.J.A.P.Martins and A. Melchiorri and G. Rocha and R. Trotta and P. Avelino and P. V. Caup and Porto Damtp and Cambridge Iap and Paris Astrophysics and Oxford Mrao and Cambridge Universite de Geneve DF-FCUP and Porto DMA-FCUP and Porto},
  journal={Physics Letters B},
  • C.J.A.P.Martins, A. Melchiorri, +10 authors Porto
  • Published 2004
  • Physics
  • Physics Letters B
  • Abstract We present up-to-date constraints on the value of the fine-structure constant at the epoch of decoupling from the recent observations made by the Wilkinson Microwave Anisotropy Probe (WMAP) satellite. In the framework of models we considered, a positive (negative) variation of the value of α at decoupling with respect to the present-day value is now bounded to be smaller than 2% (6%) at 95% confidence level. We point out that the existence of an early reionization epoch as suggested by… CONTINUE READING
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