Physicists Joao Magueijo at London's Imperial College and Andreas Albrecht
at U. C. Davis say the speed of light immediately after the beginning of
the universe was many times faster than it is now, and it has been slowing
ever since.
Albrecht and Magueijo [1999] have hypothesized that the speed of light
may have been much faster (up to 1069 times faster) in the very
early
universe. This is a theoretical model proposed as an alternative to
the inflation theory of the early universe to explain why the universe
is so uniform. The increased speed applies only to the inflationary
stage of Big Bang models, which means only the first 10-43 second
or
so. Their theory has not been verified by observation.
Albrecht, A. and J. Magueijo, 1999. Time varying speed of light as a
solution to cosmological puzzles. Physical Review D 59: 043516,
http://arxiv.org/abs/astro-ph/9811018