 Quote by DaleSpam
No, DaleSpam has insisted and continues to insist that v = dr/dt. c is a defined constant. There may be an alternative standard definition for velocity, but I am not aware of it.
What pervect is discussing is (to the best of both his knowledge and mine) not the standard definition of velocity. As he explicitly mentioned:
For four-vectors, the magnitude of the four-velocity of a light pulse is always 0, regardless of the coordinates.
|
I am not happy with your definition that
v = dr/dτ. I can't escape the idea that speed should be measured here, on my ds = rdτ worldline where I belong, not there where r=1. Is it a misconception of my part that velocity is a vector, whereas speed is a scalar? Has it anything to do, with our measurements in a 2-dimensional flat space-time ( cylindrical, conical, tilted planar ) embedded in 3-dimensions?
As for vectors, I think there exist manifolds where the dot product is not defined. ( Finslerian manifolds )
I believe that everything should follow from the metric, and from the metric only, since our clocks and rulers are measuring ds's and not arbitrary co-ordinate plantations.
Maybe, my question belongs to another thread... Anyway, thanks for the input.
Similar Threads for: One-way speed of light and clock sync
Physorg.com Science News Partner
