On 2/12/2016 9:26 am, Russell Standish wrote:
On Thu, Dec 01, 2016 at 04:26:25PM +0100, Bruno Marchal wrote:
I am not sure why he says that Einstein was wrong, as I am not sure
Einstein ever asserted that space-time or gravity was fundamental.
To say that Einstein is wrong looks like a cliché in fashion, today.
It's code speak for saying the speed of light is not a constant. It's
more a bone to throw to the media to stir up interest, than a real
scientific statement.

Of course, since the speed of light is just a conversion constant
beween our time units and our space units, we are always free to vary
the speed of light. It is just a nonlinear reparameterisation of our
coordinates. Verlinde's proposal is much, much more than that.

It is interesting that the speed of light can be regarded as nothing more than a conversion constant only if special relativity is strictly correct. If temporal variation in the speed of light is discovered, say by finding that the fine structure constant changes with time, then we would have to rethink the idea that c is just a conversion constant.

Bruce

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