Are Experiments Proving Length Contraction?

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Discussion Overview

The discussion revolves around the concept of length contraction as described in the theory of relativity, specifically questioning whether there are experiments that have definitively proven this phenomenon, similar to the barn and pole thought experiment. The scope includes theoretical implications and experimental evidence related to relativity.

Discussion Character

  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant expresses skepticism about the empirical validation of length contraction, questioning whether any experiments have proven it, particularly in relation to the barn and pole thought experiment.
  • Another participant clarifies that while mathematics is valid independently, the theory of relativity requires experimental evidence to support its claims, citing various experiments that support relativity but not specifically length contraction.
  • A different participant asserts that there is no current experimental evidence for length contraction due to technological limitations in achieving the necessary speeds for macroscopic objects, although they acknowledge evidence for time dilation and the invariance of the speed of light.
  • Another participant references explanations of electrostatic and magnetic forces on moving charges that rely on the concept of length contraction, suggesting that this may serve as an indirect indication of its existence, even at low speeds.

Areas of Agreement / Disagreement

Participants express differing views on the existence and experimental validation of length contraction. There is no consensus on whether length contraction has been proven through experiments, and the discussion remains unresolved.

Contextual Notes

Limitations include the current technological constraints that prevent testing length contraction with macroscopic objects and the reliance on theoretical frameworks that may not have been empirically validated in this specific context.

Wizardsblade
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I am quite aware of the overwellming evidence for the math of relativity, but are we sure that the meaning (time dilation, length contraction, ect.) are true? I guess what I am saying is are there any expiroments that have proven length contraction as in the barn and pole thought expiroment?
 
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I'm not sure what you mean by "evidence" for mathematics. Mathematics is "valid" or "invalid" irrespective of relativity. Relativity is a physics theory and, as is true of all such theories, lives and dies by experimental evidence. The experimental evidence (light bending by the sun, the orbit of mercury, changing lifespan of high speed particles, time variations of fast space craft, etc.) is pretty much on the side of relativity.
 
Wizardsblade said:
I guess what I am saying is are there any expiroments that have proven length contraction as in the barn and pole thought expiroment?

No, there isn't. The problem is that we don't have the technology to get macroscopic objects to move that fast. But we do have experimental evidence of time dilation and of the invariance of the speed of light. If one day we did the barn and pole experiment and found that length contraction does not occur, then that wouldn't make sense!
 
Wizardsblade said:
are there any expiroments that have proven length contraction as in the barn and pole thought expiroment?
Various explanations of electrostatic and magnetic forces on moving charges are based on the contraction of charge density when charges are in relative motion. see e.g http://galileo.phys.virginia.edu/classes/252/rel_el_mag.html
I guess this is the most clear indication that length contraction actually exists, even at very low speeds.
 
Thanks very interesting stuff.
 

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