I Why is there a universal speed limit, c, and why is it what it is?

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The discussion centers on the concept of a universal speed limit, denoted as "c," which is the speed of light. Participants explore the reasons behind this limit, questioning whether it arises from physical measurements or logical constructs. The conversation delves into the implications of a four-dimensional spacetime framework, suggesting that the speed limit is a natural consequence of how physics manifests for observers within this structure. Additionally, the dialogue touches on the philosophical aspects of causality and the foundational postulates of relativity, emphasizing that the existence of a universal speed is tied to the properties of spacetime itself. Ultimately, the nature of "c" remains a complex topic that intertwines physics with deeper philosophical inquiries.
  • #211
bobc2 said:
sahil_time, why is that not possible?

Because doing so may change the whole concept of Forces!Like if C was different for different observers then epsilon/permeability would be different and hence the electric field and magnetic pheneomenon would be different for different observers!Like Electric field at a point could have infinite possible values!
Well that's what i think!
 

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