Light waves propagate with no medium

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Discussion Overview

The discussion revolves around the nature of electromagnetic waves and the concept of a medium for wave propagation. Participants explore whether the electromagnetic field can be considered a medium similar to traditional wave media, addressing theoretical implications and conceptual clarifications.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant expresses acceptance that the luminiferous aether does not exist and questions if the electromagnetic field itself serves as a medium that permeates all space.
  • Another participant suggests that while a medium for other waves consists of material particles, the electromagnetic field does not fit this description.
  • A third participant affirms that the electromagnetic field permeates space but distinguishes between a "field" and "ether" or actual material, implying a conceptual difference.

Areas of Agreement / Disagreement

Participants generally agree that the electromagnetic field permeates space, but there is a lack of consensus on whether it constitutes a medium in the same sense as traditional wave media. The discussion remains unresolved regarding the implications of this distinction.

Contextual Notes

Participants reference the historical concept of luminiferous aether and the evolving understanding of electromagnetic fields, indicating a dependence on definitions and unresolved conceptual distinctions.

mrcotton
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I have come to accept that the luminiferous aether does not exist.

When we say that the electromagnetic wave is an oscillation of the electromagnetic field, then is not the electromagnetic field itself a medium that permeates all space?

This is probably a dumb question, but I am as dumb as I look!
 
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It was a dumb question then?

I suppose the answer is that a medium for other waves is made of material particles and the electromagnetic field is not.
 
No, it is not a dumb question but it was only 3 and a half hours since you posted it. People don't sit around waiting for someone to post a question.

As to your question, yes, the "electromagnetic field" is a field that permeates space. But a "field" is not the same thing as "ether" or some actual material.
 
Thanks for the response HallsofIvy,
3 and a half hours, I must move fast because it seemed like an eternity to me. (This excuse never washes for my gain in mass over the years either)
I am always happy to wait for the excellent responses on physics forums, I guess on reading around in the other threads I thought I had asked a really dumb question.

https://www.physicsforums.com/showthread.php?t=86691

I came across this old thread and really enjoyed the direction this has sent me in.
 

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