ZapperZ said:
But what about your understanding of what a "momentum" is? Do you think "p=mv" is the ONLY way to understand momentum? ...
... If you are ONLY using this as your objection, then you have A LOT of learning to do.
Say what?
Zz.
Of course we can talk about the different uses of the word „momentum“. Does it help us in finding, what “understanding” means?
We know that the photon has a momentum. We assign a mass to a moving photon, and in this way we transfer the question of momentum to the question, why a moving photon has a mass. And of course QM has a description which seems to tell us about a mechanism which has the result wanted.
The question remains: What do we mean when we say, that present physics understand the photon?
When I say that the understanding of the photon is not satisfying, then I refer to the corresponding considerations and concerns of Louis de Broglie.
He received the Nobel price for his role in founding QM. He was a comparable genius as Einstein, both where friends and had similar ideas about physics and the further development of it.
When Jackson published the book, de Broglie was still very active in his physical work. Even if he did not read the book, all phenomena and the formalism described in this book were known to him. And despite of this knowledge he stated that the photon is in fact not understood.
If you find, that the photon can be completely understood from the contents of Jackson, then YOU should be a greater genius than de Broglie. Are you?
... Furthermore, and this occurs very often to people who have a poor understanding of SR, the contraction is view BY someone in another frame, NOT by the person in THAT frame. An observer in the proper frame observes NOTHING contracting and nothing dilating.
Of course is that, what I stated. The observer at rest should see the moving photon contracting to zero. But the observer at rest notices that the moving photon has a finite, not zero, length. That was what I wrote. Not clear?
This occurs often to people who answer to a post without reading it carefully!
... The "contraction" IS due to how we measure and define space!
One can understand it in this way, However, Einstein did not. In one of his books he has explained, how he extended SR into GR. And from his considerations (he thought about a rotating disk which contracts at its rim) it is very clear, that for Einstein contraction was not the result of a measurement and dependent on the methods of this measurement, but it was reality.
And so, show me where SR doesn't work and somehow requires YOUR version of it.
With pleasure! A good example is the Sagnac experiment. (A rotating cylinder mirrored inside). The prediction of its result according to Einstein’s SR was falsified by several experiments. If a prediction is made by another version of relativity which is similar to the version of Einstein, but assumes the existence of an ether, we get the correct prediction.
... EVERY, and I mean EVERY, "explanation" ends up being a description, in which another lower level explanation is needed.
You are right!
According to reductionism understanding means that on a lower level there is a description, from which the phenomena on the higher level can be logically developed. And further in the development of physics the same has to be done regarding the lower level.
And now, please tell me:
For special relativity
what is the lower level description from which we can logically deduce
- the constancy of c
- the relativity principle
- the contraction of space
- the dilation of time
- the relativistic mass increase ?
I can ask you similar questions regarding GR and QM.
Physicists like de Broglie were looking for just these answers.
What you are proposing doesn't even qualify as a description, much less an explanation. It is a guess work. All you have satisfied is the sum of spins to produce a spin of 1. You have totally neglected ALL the various incompatibility of your guess, and you have totally ignored what we ALREADY know about formation of composite bosons from condensed matter.
I never said that I have a solution for the photon. I have indicated the way proposed by de Broglie. His proposal was of course still on a speculative basis, because it was a first step.
But at present there is to my knowledge no better understanding of the photon than it was at times of de Bloglie in the 1960ies and 1970ies. Or do you have any?
I strongly suggest you re-read the guidelines to this forum that you have explictly agreed to before you proceed any further. If you think you have something substantial to present beyond just idle speculation, then please submit this to the IR forum. If not, you will run the risk of your post being deleted or this thread being locked.
It was not my intention to propose new physics at this place, but to show which understanding of famous physicists (Nobel laureates) exist, which the contributors to this discussion seemed to be not aware of. And if you handle the forum as announced, you would also throw out someone like de Broglie, if he would be alive and would contribute to this forum.
The same you should have to do to Richard Feynman in a similar situation. I have a statement from him in which he says, that QM, in his case QED, delivers good descriptions, but the causes of it are not understood. – This is quite exactly what I wanted to say.
Also in a previous discussion, I had the impression that there is little knowledge in this forum about the history of physics. And if history is not known, then one has easily the impression that there are only those theories available which have been accepted by the main stream. But there are others which have never been falsified. They were just forgotten.