1 minute ago
To be a valid theory, Relativity would have to be able to define the 4D shape of space-time. Does the theory do this, or does it just assume that space-time is curved?
My problem with "space-time" is that it equates and combines two things that are not the same at all. It assumes that the progress of time is like physical motion through space. People say that we are moving through space-time at the speed of light.
Time is the interval between sequential events. It is not a distance we travel.
Since we know that there is a cosmic speed limit, time dilation is a physical consequence of approaching that speed limit.
There is much explained by Relativity. Could there be another model that doesn't involve the concept of "space-time"? What if Gravity really is a force?