- #106
akhmeteli
- 805
- 38
Maaneli said:As far as how Barut decides what variational principle to apply, I think it is no different than in the variational formulation of standard QM. One would first write down the wavefunction of the physical system; if it is the wavefunction describing a singlet state, then that is the wavefunction with respect to which you apply the variational principle, as it is not factorizable. I don't see any confusion here.
Cannot say the same about myself:-(
Let us summarize. If I understand you correctly, you believe that, in Barut's opinion (and in your opinion), the configuration space and entangled wavefunctions are an integral part of SFED (If I misunderstood you, please advise).
Maybe this is indeed his opinion. Then thank you for indicating this to me (I had a different idea of what SFED is). I should reiterate then that this is another point where he smuggles in the physical contents of 2nd quantization (not the form, I'm ready to admit). I should also reiterate that maybe the configuration space should arise in the "final" theory as a result of KSP, not as a new postulate.
Maaneli said:Sorry, it is simply not accurate to call a c-numbered wavefunction in configuration space satisfying the proper permutation symmetries, "second quantized". Furthermore, just because second quantization can be introduced when particle numbers are fixed, doesn't mean that the 1st-quantized wavefunction is also "second quantized", especially because the operator wavefunction form allows for the POSSIBILITY of variable particle number. This is why the Fock space is not something you can just dispense with, if you are going to call a matter theory second quantized.
Again, I tend to believe that your reasoning is almost entirely about the form, not contents. I also stand by my initial statement that Barut smuggles in the physical contents of 2nd quantization in his theory (not the form, I admit).
Maaneli said:Then you are just not using the terminology of second-quantization properly. By your logic, the original Dirac equation with the Dirac sea mechanism to allow for variable fermion numbers, is also a second quantized theory "for all intents and purposes". But this is just not true. The "form" of the theory does indeed matter in the definition of whether it is 1st or 2nd quantized.
No, I just stated that the Dirac sea introduces some elements of 2nd quantization in the original one-particle theory, because the Pauli principle is not a part of one-particle theory.
Maaneli said:But in the DM Lagrangian, you already have self-field interactions and entanglement. How does KSP linearize this self-interaction?
I don't think there is any entanglement in the DM Lagrangian (defined in (3+1) dimensions). If you disagree, please advise.
In the same way it linearizes any NDE.
Maaneli said:Also, it sounds like you are admitting that KSP is just a form of second quantization (otherwise I don't see why you would use it).
I could admit it only as far as the form, not physical contents, is concerned.
Why would I use it? This is a really good question. I would use it to prove that one can transform some NDE in (3+1)D space into QED using KSP. That would suggest that that NDE is the "final theory", and entanglement and the Fock space are the artifacts of KSP. Again, nobody has done anything like that and maybe it'll never be done. At the moment, though, KSP seems important to me as it describes a natural mechanism generating the Fock space from a banal NDE.
Maaneli said:Also, just because there are solutions to the linear equation that are not solutions to the nonlinear equation, doesn't mean those new solutions to the linear equation are artifacts.
It does not. But this is a possibility.
Maaneli said:There is however a way I discovered to transform between the linear Schroedinger equation and a nonlinear Burger's equation (using the Nagasawa-Schroedinger and Cole-Hopf substitutions), and both equations describe the same physics. I have sent you my paper where I do this.
Thank you. I'll look at it.
I'll try to reply to other points of your post later.