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Sure, but irrespective of what units we apply to it, light still has a maximum speed of a certain value. Why is it that value, 300 million metres per second?Chris

This is so simple, it must have been suggested already and probably discredited, but the perfect simplicity of this really grabs my imagination.

why light can't travel the next Planck length any faster than 1 Planck time

What is the reason that the speed of light in a vacuum has the value that it does?Chris

...density of spacetime will dictate [photon] velocity.

Quote from: QuantumClue on 18/11/2010 20:32:21...density of spacetime will dictate [photon] velocity.Can you explain what you mean by density w.r.t. spacetime?

Still, that doesn't answer the question, why 300 and not 200 or 500?

Because Maxwell's equations say (IIRC) it's the reciprocal of the square root of the product of the permittivity and permeability of free space.Those two quantities are measurable (actually, one is defined by our choice of the definition of the Ampere); if you do the maths you get about 300000000 m/s.

Prof. John Barrow a mathematical physicist among several other scientists have stated that it is possible light speed was atleast 50 times less than what is percieved today

Most technically, these days, because we have now gone and defined the metre in relation to the speed of light and the second, so we now have the situations that the standards body have actually defined what the speed of light must be, and all we can do is change our measure of the metre rather than our measure of the speed of light.

There are other related issues, such as the permittivity and permeability of free space, but whether they actually give a cause to the speed of light, or merely a codependency, is another matter.