A simple cosmology with a varying fine structure constant.

  title={A simple cosmology with a varying fine structure constant.},
  author={H{\aa}vard Bunes Sandvik and John D. Barrow and J. C. R. Magueijo},
  journal={Physical review letters},
  volume={88 3},
We investigate the cosmological consequences of a theory in which the electric charge e can vary. In this theory the fine structure "constant," alpha, remains almost constant in the radiation era, undergoes a small increase in the matter era, but approaches a constant value when the universe starts accelerating because of a positive cosmological constant. This model satisfies geonuclear, nucleosynthesis, and cosmic microwave background constraints on time variation in alpha, while fitting the… CONTINUE READING
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