Is the Speed of Light Absolute or Relative in Special Theory of Relativity?

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Discussion Overview

The discussion revolves around the nature of the speed of light in the context of the Special Theory of Relativity, specifically whether it is absolute or relative. Participants explore the implications of relativity on the speed of light and its constancy across different reference frames.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant expresses confusion about whether the speed of light is absolute or relative, suggesting it may vary between different reference frames.
  • Another participant argues against the notion that nothing is absolute in Special Relativity, stating that certain quantities, such as spacetime interval and proper time, are indeed absolute.
  • Some participants propose that the speed of light should be viewed as a constant rather than an absolute or relative quantity, emphasizing its constancy relative to any inertial observer.
  • It is mentioned that the locally measured speed of light remains constant relative to any observer, regardless of whether they are inertial or not, in both special and general relativity.

Areas of Agreement / Disagreement

Participants express differing views on the nature of the speed of light, with some asserting it is a constant while others argue for its relative nature. The discussion remains unresolved with multiple competing perspectives.

Contextual Notes

There are limitations in the discussion regarding the definitions of "absolute" and "relative," as well as the implications of different reference frames on the speed of light. These aspects remain unresolved.

astro2cosmos
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According to Special Theory of Relativity nothing is absolute in this universe, but relative to each other. as we know that Einstein told me that speed of light is max. Now I'm little bit confuse if speed of light is absolute or relative i.e it may be max. for initial reference frame but for any other frame it may/should be change from the value of 3 X 108 m/s. can anyone give me the reason for this.
 
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astro2cosmos said:
According to Special Theory of Relativity nothing is absolute in this universe, but relative to each other.
That is not correct at all. There are many things which are absolute in SR. E.g. the spacetime interval, proper time, mass, the norm of the 4-acceleration, etc.
 
And it is probably more correct to say that the speed of light is a constant, not an "absolute" or a relative thing. Ie, it is a constant relative to any inertial observer.
 
russ_watters said:
And it is probably more correct to say that the speed of light is a constant, not an "absolute" or a relative thing. Ie, it is a constant relative to any inertial observer.

Actually the locally measured speed of light is constant relative to any observer, inertial or not, in both special and general relativity.
 

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