http://www.wired.com/wired/archive/14.09/stringtheory.html
Lee Smolin: "Well, every string theory that's been written down says
the speed of light is universal. But other ideas about quantum gravity
predict the speed of light has actually increased. And an experiment
on the Gamma Ray Large Area Space Telescope, launching next year, will
check this. So I've said, look, if the speed of light isn't universal,
that disconfirms string theory. But the string theorists say they
could probably invent versions of the theory that work either way.
We'd have to change our notion of what science is to accommodate this
proposition. You just can't do science on that basis."
If the speed of light isn't universal, that also disconfirms Divine
Albert's Divine Special Relativity:
http://www.fqxi.org/data/articles/Searching_for_the_Golden_Spike.pdf
"Loop quantum gravity also makes the heretical prediction that the
speed of light depends on its frequency. That prediction violates
special relativity, Einstein's rule that light in a vacuum travels at
a constant speed for all observers..."