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Hey folks,As I've said before I'm no physics guru, it's just a hobby of mine so most of this post is gonna involve a bit of visualization rather than hard math of any sort.One common visualization of course is that of spheres on a fabric representing objects in space-time. So I was wondering, if the speed of wave traversal increases with increasing tension of a string (1D) / fabric (2D), then shouldn't the cosmic speed limit, and hence the speed of light, increase with increasing tension of space-time?I ask this considering the fact that the universe is expanding: if space-time it self was created in the big bang, then that along with the effects of dark energy (with both expanding the universe) should be increasing the tension on the fabric of space-time, no?And if it is, then shouldn't the speed of light be increasing slightly with the expansion of the universe and, specifically, space-time?
The speed of light, in meters per second, is fixed by definition. The only way it can change is to change its definition.
There have been results that suggest that certain fundamental parameters of the universe which were though to be unchanging might actually change with time, and these changes would change the speed of light. But this is pretty controversial currently.
There is just a simple easy to explain flux particle field with tension on it. If the tension goes up… gravity goes up, and so does the speed of light and everything else with it. That includes any type of measuring device and the speed your brain is working. Increase or decrease tension and it changes everything along with it. Net effect… you might not notice anything.It’s like being a character in a movie and you don’t know the speed the projector is running… fast, slow, stop, start… you don’t know.
The speed of light will not increase unless the permittivity and the permeability of space vary.
classically c - the speed of light pops out of maxwell's equations and is related to the inverse of the root of the product of permittivity and permeability. I cannot see a reason for c not to vary if one of those quantities changed. How either of those quantities could change is another question entirely