Question about Special Relativity

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Discussion Overview

The discussion centers around the origins and implications of the Special Theory of Relativity and the Lorentz Transformation, particularly in relation to the Michelson-Morley experiment and the concept of ether. Participants explore historical perspectives, the motivations behind the theories, and the relationship between electromagnetism and classical mechanics.

Discussion Character

  • Exploratory
  • Historical
  • Debate/contested

Main Points Raised

  • Some participants suggest that the Special Theory of Relativity and the Lorentz Transformation were developed primarily to explain the null result of the Michelson-Morley experiment in the context of ether.
  • Others argue that the initial assumptions of Special Relativity, which do not include the ether, were fundamentally different from those of Lorentz, who initially related length contraction to ether effects.
  • A participant notes that the idea of apparatus compression due to ether motion was proposed by George Francis FitzGerald, indicating a historical reluctance to abandon the ether concept.
  • Another viewpoint emphasizes that the implications of Maxwell's predictions regarding electromagnetic wave speed created significant challenges for classical mechanics, which Einstein's work addressed, thus providing a deeper understanding of the Lorentz transformations.

Areas of Agreement / Disagreement

Participants express differing views on the motivations and implications of the Special Theory of Relativity and the Lorentz Transformation. There is no consensus on whether the theories were primarily responses to the Michelson-Morley experiment or if they addressed broader issues in physics.

Contextual Notes

Participants reference historical figures and concepts, but there are unresolved questions regarding the relationship between ether, length contraction, and the implications of Maxwell's equations. The discussion reflects a range of interpretations and assumptions that are not fully reconciled.

grounded
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Was not the Special Theory of Relativity and the Lorentz Transformation created simply to explain why the Michelson-Morely experiment did not detect any change in light caused by the ether?
 
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It was an Irish physicisist (what was his name?) who first suggested that the null result of the M-M experiment might be due to a compression of the apparatus along the direction of motion of the ether. THis idea was part of the reluctance to let go of the notion ofth ether which physics had devoted so much time and theory to. Lorentz then came up with his contraction formula. SO it was, initially, used for length contraction as caused by the ether.

Special relativity was produced by Einstein due to completely separate initial assumptions (the postulates) which require there to be no absolute reference frame, and therefore no ether. IT just so happened that SR required there to be length contraction along the direction of relative motion, and the formula for this contraction was exactly the same as the one developed by Lorentz.
 
Originally posted by Chi Meson
It was an Irish physicisist (what was his name?) who first suggested that the null result of the M-M experiment might be due to a compression of the apparatus along the direction of motion of the ether.
George Francis FitzGerald (1851-1901).
 
Originally posted by grounded
Was not the Special Theory of Relativity and the Lorentz Transformation created simply to explain why the Michelson-Morely experiment did not detect any change in light caused by the ether?

I feel that this is a massive understatement of the problem Einstein addressed. The issue at stake, the reason the M-M experiment was done, was due to Maxwell's prediction. When Maxwell predicted that the speed of electro-Magnetic waves was independent of any other velocities, he threw the tried and true Galilean transforms out the window. This created a schism between Electromagnetism and classical mechanics which disrupted the world of physics for 50yrs. Einsteins derivation tied it all back together. The beauty of it was the simplicity of the derivation, the result was the already known Lorentz transforms, the method gave them a simple clear physical meaning.
 

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