There's a Portuguese cosmologist, João Magueijo, working at the imperial college in London, that works on theories that have, at the begining of the universe, a speed of light faster than the current one. What happens is that the speed of light is still the upper limit, but that limit is higher in the begining of the Universe. IIRC, Einstein himself worked with such a theory.
By the way, great joke octathlon
He turns his mind away from those phenomena, and having done so, inclines his mind to the property of deathlessness: 'This is peace, this is exquisite — the resolution of all fabrications; the relinquishment of all acquisitions; the ending of craving; dispassion; cessation; Unbinding.'
(Jhana Sutta - Thanissaro Bhikkhu translation)