The discussion revolves around the postulate of the invariance of the speed of light, particularly in the context of redshift observed when moving away from a light source. Participants explore the implications of this phenomenon on the understanding of relative velocities and the constancy of the speed of light, engaging in both conceptual and technical reasoning.
Participants exhibit significant disagreement regarding the interpretation of redshift and its implications for the speed of light. There is no consensus on the claims made about relative velocity and the implications for the postulate of invariance.
Participants reference various concepts such as separation rate, relative velocity, and the relativistic velocity addition law, indicating a complex interplay of ideas that may depend on specific definitions and interpretations. Some assumptions about observer perspectives and measurement limitations are also noted but remain unresolved.
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.