Invariant speed: Difference between revisions

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{{Short description|Concept in relativistic physics}}
{{Short description|Concept in relativistic physics}}
The '''[[Invariant (physics)|invariant]] speed''' or '''observer invariant speed''' is a speed which is measured to be the same in all [[reference frames]] by all observers.  The invariance of the [[speed of light]] is one of the [[postulates of special relativity]], and the terms ''speed of light'' and ''invariant speed'' are often considered synonymous.  In non-relativistic [[classical mechanics]], or Newtonian mechanics, finite invariant speed does not exist (the only invariant speed predicted by Newtonian mechanics is infinity).<ref>{{cite book | author=Rindler, Wolfgang | author-link=Wolfgang Rindler | title=Relativity: Special, General and Cosmological | publisher=Oxford University Press | year=2001 | isbn =0-19-850836-0 }}</ref><ref>{{cite journal | last=Mermin | first=N. David |author-link=David Mermin| title=Relativity without light | journal=American Journal of Physics | publisher=American Association of Physics Teachers (AAPT) | volume=52 | issue=2 | year=1984 | issn=0002-9505 | doi=10.1119/1.13917 | pages=119–124| bibcode=1984AmJPh..52..119M }}</ref>
The '''invariant speed''' or '''observer invariant speed''' is a [[speed]] which is measured to be the same in all [[reference frames]] by all observers.  The [[Invariant (physics)|invariance]] of the [[speed of light]] is one of the [[postulates of special relativity]], and the terms ''speed of light'' and ''invariant speed'' are often considered synonymous.  In non-relativistic [[classical mechanics]], or Newtonian mechanics, finite invariant speed does not exist (the only invariant speed predicted by Newtonian mechanics is infinity).<ref>{{cite book | author=Rindler, Wolfgang | author-link=Wolfgang Rindler | title=Relativity: Special, General and Cosmological | publisher=Oxford University Press | year=2001 | isbn =0-19-850836-0 }}</ref><ref>{{cite journal | last=Mermin | first=N. David |author-link=David Mermin| title=Relativity without light | journal=American Journal of Physics | publisher=American Association of Physics Teachers (AAPT) | volume=52 | issue=2 | year=1984 | issn=0002-9505 | doi=10.1119/1.13917 | pages=119–124| bibcode=1984AmJPh..52..119M }}</ref>


== See also ==
== See also ==

Latest revision as of 00:58, 2 November 2025

Template:Short description The invariant speed or observer invariant speed is a speed which is measured to be the same in all reference frames by all observers. The invariance of the speed of light is one of the postulates of special relativity, and the terms speed of light and invariant speed are often considered synonymous. In non-relativistic classical mechanics, or Newtonian mechanics, finite invariant speed does not exist (the only invariant speed predicted by Newtonian mechanics is infinity).[1][2]

See also

References

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