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originally posted by: delbertlarson
a reply to: mbkennel
Virtues of particle physics
1. Actually connected to enormous quantities of experimental results
2. Actually connected to quantum mechanics
3. Actually connected to relativity
4. Actually publishes falsifiable theoretical proposals
5. Actually falsifies them
I agree with your first three points, but not the last two. I will take up number 5 first. When it comes to the standard model, what possible experiment could be done that would falsify it? Relativity, yes. Quantum Mechanics, yes. Those are falsifiable theories. But the standard model? Any new particle just gets kluged in, there is no predictability on masses at all, and an enormous number of parameters have been arbitrarily fudged or made up just to fit the data. Please let me know if you can think of anything that would cause the standard model to be falsified, rather than just seeing parameters adjusted, new ones added, or elementary particles or forces added as new things are found.
Well, then if modification of models doesn't count as 'falsification' as a result of experimental results, what does count?
One falsification or at least major blow to Standard Model would of course be seeing no Higgs ever. If you start introducing new particles and new forces then that counts.
In practice, what falsification means is that there are numerous proposals for extensions to SM, many of which have experimental predictions.
I'm not a particle physicist but it's not my understanding that a fermion can't be a force carrier, but rather that they don't end up being such in interactions which can be ascribed a kind of 'classical potential'.
originally posted by: delbertlarson
a reply to: Arbitrageur
I'd like your opinion on a question. (See my post on the bottom of page 296 for background.)
Can a fermion be a force carrier?
Beginning students in physics are taught it's massless, but at higher levels students should understand we can't prove the mass is precisely zero, we can only put upper limits on the mass, based on more and more precise measurements.
originally posted by: ImaFungi
a reply to: delbertlarson
A photon is not massless;
Giving a mass to photons is unappealing not because it violates special relativity – it doesn’t – but because it violates gauge-invariance, the most cherished principle underlying the standard model.
originally posted by: delbertlarson
I disagree. If the Higgs had not been found, the standard model would likely have just claimed that it either had too small of a cross section to see yet, or that it was at a higher mass, or some such thing.
As for introducing new particles - well, that is how the standard model has come about! It started with up, down, and strange. Then charm was found, and that was going to be it. But then the intermediate vector bosons came, as well as the bottom and top quarks. The standard model just absorbed them and marched along. It didn't predict all of them before they were found, and never predicted ahead of time with any specificity. It's not really a scientific theory in that respect. (I do believe there was some idea where the W and Z masses would be; and the top was indeed predicted, but not its mass.)
I will agree with you wholeheartedly that many falsifiable extensions are allowed and encouraged by the practitioners. I would also stipulate that additional, falsifiable epicycles were allowed and encouraged by the practitioners of that day. My problem is that some falsifiable proposals are dismissed by nearly every practitioner before they even get a hearing - if that falsifiable proposal does not meet certain "minimum standards". Of course, for me it has been a bit personal, as I have made falsifiable proposals that didn't meet the prevailing "minimum standards", yet I maintain that my proposals do three things: 1) they agree with all experimental data to date; 2) they are logically self consistent; and 3) they logically lead to an experimental test that can differentiate them from the existing theory.
One example of my problem is discussed above in this thread when it comes to whether a fermion can be a force carrier.
I have had other similar issues. Such as the fact that quarks are now part of the "minimum standards" for consideration of any theory, even though no quark has ever been isolated (nor can one be, by the theory).
originally posted by: Arbitrageur
Giving a mass to photons is unappealing not because it violates special relativity – it doesn’t – but because it violates gauge-invariance, the most cherished principle underlying the standard model.
originally posted by: delbertlarson
Some thoughts in there I support, such as an implied aether to support electromagnetic phenomena such as photons, or the fact that an electron can transmit momentum. However, I side with established physics in other areas, such as a belief that the photon is massless. A photon does have momentum, but no mass that has ever been measured.
In my ABC Preon Model, I propose that it is the neutrino that carries the force that binds the preons, and that is the reason for my question. In an earlier post, on page 296 of this thread, I mention an issue regarding Feynman diagrams as it relates to fermion force carriers. I believe it is a misunderstanding of Feynman that leads to the proclamations about fermions not being allowed as force carriers, and I am soliciting other opinions on this matter.
originally posted by: Arbitrageur
By how much? You've done the general relativity math to calculate this?
originally posted by: greenreflections
End (tail coordinate) of 100 km object would show more elongated when compared to 'nose' of smaller object proportionally.
originally posted by: greenreflections
You see, you think of gravity as real force even knowing it is not. My premise is that physical body's reaction being inside gravity affected area is governed by it's dimensions rather then mass.
That's the whole 'juice' about GR.
What 'minimum standards' do you mean?
I'm no expert here, but googling that question leads to these answers which do need to be addressed.
Well the symmetries and observations predicted by quarks are pretty clear.
You suggest an implied aether to support phenomena such as photons; then I would ask... does the aether have mass?
Or is it thought gluon, w, and z are like little marbles?
Or is it thought they are like little seas... or blankets?
Is it thought, as EM field, as gravity field, might exist throughout universe, as a real material substance;
Is it thought gluon exists throughout the universe as a real connected material substance? Or only specific gluon particles exist locally in relation to nucleus and a more just scattered around?
True, but the unexplained mystery is why you make such a big deal of the distinction in a discussion of gravitational tidal effects when the math usually comes out so close the difference isn't worth mentioning, as it would for the examples you suggested, which didn't get into things like frame-dragging where you would see the difference.
originally posted by: greenreflections
a reply to: Arbitrageur
GR is a continuation of Newtonian Mechanic. Newtonian Mechanics does not discuss or meant to include an attribute of space-time metric around massive physical body, like a planet or a star.
its more like time/dark matter metric. space does not bend. read thread in my signature
originally posted by: greenreflections
a reply to: Arbitrageur
GR is a continuation of Newtonian Mechanic. Newtonian Mechanics does not discuss or meant to include an attribute of space-time metric around massive physical body, like a planet or a star.