The forum discussion centers on the postulate of the invariance of the speed of light, particularly addressing misconceptions about redshift and relative velocity. Participants clarify that redshift does not indicate that light travels slower than the speed of light (c) but rather results from the increasing distance between the light source and the observer. The discussion emphasizes the importance of understanding the relativistic velocity addition law and the distinction between recession speed and relative velocity. Misinterpretations of these concepts lead to confusion regarding the nature of light propagation and redshift phenomena.
PREREQUISITESPhysicists, students of relativity, and anyone interested in understanding the nuances of light propagation and redshift in the context of modern physics.
externo said:The question is: is space-time Minkowskian or euclidean ?
Source:Wikipedia said:Minkowski argued that Lorentz's introduction of the contraction hypothesis "sounds rather fantastical", since it is not the product of resistance in the aether but a "gift from above". He said that this hypothesis is "completely equivalent with the new concept of space and time", though it becomes much more comprehensible in the framework of the new spacetime geometry.