FrediFizzx wrote:Ok guys, let's get back on topic here. There are other threads to discuss Joy's simulations or make a new thread. I believe in this thread we are assuming that Joy's model is correct and with that assumption Jay wants to know if that could help him in his theory with his non-locality involving the double slit scenario. Jay, can you explain in words how your quantum potential arises?
Yes Fred,
Well stated. I am trying to understand Joy's approach better from a conceptual standpoint, to see if and how it might be applied to double slit. I did read Joy's four-page paper yesterday as well as rereading Einstein-Podolsky-Rosen (EPR) which I had read years ago, and had planned to pen some questions to Joy over the weekend. But let me reply right now to Fred.
The quantum potential arises in the course of my 225-page paper at
http://jayryablon.files.wordpress.com/2 ... mplete.pdf. Obviously I cannot ask anyone to read the whole thing, but I can steer you to the key places in the paper where the potential arises and is developed, as well as discussing the (still-ongoing) evolution in my thinking about this potential. And, Fred, I will say that I am also "cooking" the comment you made the other day about virtual photons going through one slit while the electron goes through the other, as a possible path to a local explanation.
I will write and post my reply to Fred in several parts. This part will be:
PART I: GENERAL BACKGROUNDMy quantum potential arises from the path integral formulation of quantum field theory which started with Richard Feynman, so first you have to buy that formulation. In the first full paragraph on page 78 of the linked paper, five lines down, you will see the usual formulation of the path integral in terms of Z=.... One takes an action S(G) which is a function of a gauge field G and via the path integration turns it into a quantum amplitude W(J) which is a function of a current density J. But, W(J), just like S(G), has dimensions of angular momentum = Energy x time a.k.a. action, which is of course also the dimensionality of Planck's constant. So just to get our language straight, I refer to S(G) as a "classical action" because that action is connected to a classical field equation via the Euler-Lagrange equation, and I refer to W(J) as a "quantum action" because that action is what one gets only after doing the path integration, which means carrying out the full path integration over DG and d^4x in that equation I just referenced on page 78. One will appreciate that this "quantum action" W(J), although having the same dimensionality as the "classical action" S(G), will certainly manifest different physics properties. One will also appreciate that because the classical gauge field G is the variable of integration in the path integral, once the path integral is done, there will no longer be a gauge field G in any of the equations. All that remains behind is a current density J and a quantum action W(J). Finally, if one were to take a time density of the classical action in the form E(G)=S(G)/time, then one would have a "classical energy" which in some circumstances could be a potential form of energy. Similarly, if one were to take as I later do, the time density of the quantum action in the form E(J)=W(J)/time, then one would have a "quantum energy" which also could in some circumstances be a potential form of energy. That is to say, just as the "quantum action" is expected to manifest differently than the "classical action," if we end up dividing these by time somewhere along the way, we will get a "quantum energy" versus a "classical energy" which could in some instances be a "quantum potential" versus a "classical potential," and these will also have different physical properties and require different understandings and interpretations which will carry through directly from differences between the classical versus quantum actions. So that explains the language I am using when I refer to a "quantum potential" versus a "classical potential." The "quantum potential" which ends up being at the heart of my theory is in fact the result of a later E(J)=W(J)/time calculation. And once I apply this to double slit, this does eventually turn into my "guiding potential" which looks like the sort of thing that David Bohm proposed with "pilot waves." Bottom line for this paragraph: If one believes that W(J) that emerges from path integration is
physically real and observable and not just some helpful but non-existent epistemological construct, then one must believe that its time density E(J)=W(J)/time is equally real and observable. And this, coupled with some other evidence I will review momentarily, is what provides me with a rock solid conviction that my quantum potential is part of observable physically reality as EPR defined that term.
Now, let's talk briefly about the place that path integration occupies in the overall scheme of modern physics. Simply put:
path integration is what we use to convert a classical field theory into a quantum field theory. No more and no less. It is that simple. Take any classical theory you wish. Electrodynamics with mediating field A^mu. Weak or strong interactions with mediating field G^mu. Even gravitation with mediating field g_mu nu (which shows up in the Einstein-Hilbert action with g and R). Write down its classical field equation(s). Use Euler Lagrange to obtain an action S(mediating field). Then plug that into the path integral with the mediating field as the variable of integration, do the math, and out pops W(source) with the mediating field stripped out because it is the variable of integration. For EM and weak and strong, the source is J^mu. For gravitation it is T^mu nu. And that is it!
W(source)=... is the quantum field equation, and these quantum field equations are totally parallel to Maxwell's equations and the Yang-Mills equations and the Einstein equation in classical field theory. But if a quantum action behaves and needs to be understood differently than a classical action, then a quantum field equation also behaves and needs to be understood differently than a classical field equation, in spades! In many ways, my own conceptual struggles at present are rooted in the fact that I have derived some quantum field equations for W(J) which have never before been found, and am trying to master what these equations teach us about the universe. I feel much as Dirac must have felt, when he said that his equation "is smarter than its author." And I am asking for insight from you all so I can become as smart as my equations, which is why I stared this thread. Specifically, these quantum field equations I obtained for W(J) dump right onto middle of the table, all of the other conceptual conundrums of quantum theory such as locality and entanglement. So I landed right in the middle of what you all have been passionately debating, but I came in through a different door via having analytically done a previously-thought-to-be intractable path integral (subject of the next paragraph), and found that understanding the resulting equations landed me smack into the middle of a locality conundrum. Which, by the way, I take as a sign that the equations I derived are very much on the right track, because any quantum field equations, if correct,
should land their author right in the middle of all these quantum conundrums. But, at the same time, they may also give some previously unavailable guidance about how to work one's way through these quantum conundrums. This is another reason I am coming to you all for helpful insight.
Now, you may ask, if extracting a quantum field theory from a classical field theory is as simple as I said in the last paragraph -- just find your classical action from the classical field equation, plug it into the path integral, and pop out the quantum field theory -- then why do we not have complete quantum field equations for Yang-Mills gauge theories and for gravitation? Why do we really only have a complete quantum field theory for electrodynamics? In theory, it really is as simple as I said in the paragraph above. But in practice it is extraordinarily difficult. Why? One word:
mathematics! The mathematics of doing a path integral
analytically and exactly is extraordinarily difficult, and indeed, has been one of the most intractable challenges faced by anyone seeking to develop quantum Yang-Mills theory, and even more so, quantum gravitation. Why is this so difficult? Because a path integral is of the form (again, full paragraph on page 78 of the linked paper, five lines down, looks like I left out the discardable coefficient C in the paper):
C W(J) = $DG exp i ($d^4x S(G))
and only the QED action is quadratic in G, i.e., only the QED action has terms of the form G^2 + JG and
nothing of higher order. The Yang-Mills action has terms up to G^4, and for gravitation, it is totally nuts if you unpack R and g into g_uv and so all bets are off. Why is this a problem? Not because of $DG and not because of $d^4x.
Because of the higher-than-G^2 terms in the action. Why? Because for an action of the form S(G) = G^2 + JG, the above equation for W(J) fits the template of an ordinary Gaussian integral (see, e.g.,
http://en.wikipedia.org/wiki/Gaussian_i ... n_function), and we know how to solve those. The reason we can get a quantum field theory for electrodynamics, is because it obliges us by only having a quadratic action. Yang-Mills is not so courteous, and gravitation, forget about it. Specifically, as of 2014, with all of the mathematics that is known in the world, it is still
not known even how to
analytically perform a Gaussian integration if the exponential being integrated contains Ax^4 + Bx^3 + Cx^2 + Dx + E. If you want an exact analytical answer, you have to ditch the x^4 and the x^3 terms. But in physics, and in Yang-Mills theory specifically,
the G^4 and G^3 terms which prevent us from doing the mathematics, are precisely the very same terms that make strong and weak interactions non-linear! So this means that to date, humankind has never really seen an
exact analytical equation for a non-linear quantum field theory with a quantum action action W(J) obtained from a
non-linear classical field theory. We only have an analytical quantum field theory for electrodynamics, and the reason for that, is that electrodynamics is a
linear theory, and the reason for that is that the terms in its action go no higher than G^2. Now, to be sure, physicists do not easily give up on things like these, so there are inexact workarounds. "Perturbative gauge theory" is one such workaround. So too is "lattice gauge theory." And, it is a widely utilized trick to employ the operator variational G=(delta /delta J)(JG) to replace the G^3 and higher terms in an action with terms in J so that the Gaussian integration only needs to be done on the quadratic G^2 + JG, see the first full paragraph on page 79, but this only solves the path integral on term-by-term basis by popping out Green's and Wick's functions. It does
not yield a closed form solution and putting the term by term results together into closed form is also an intractable problem. So these theories and approaches all make compromises and simplifications and forgo certain symmetries in order to get some picture of W(J), and in many cases, they use computers to help. In fact, lattice gauge theory requires enormous computing power, which helps explain why Kenneth Wilson, who developed lattice gauge theory, was also a pioneer in promoting the development of supercomputers which advanced many other good technological benefits flowing from improved computing capacity beyond being able to do lattice calculations. But I digress.
Humankind, and particularly the physicists who care about this stuff that puts the rest of the population to sleep, simply have never before seen what an exact analytical
non-linear quantum field equation looks like. And because of that, they have not had a chance to struggle (and it is a struggle) with trying to understand what these "smarter then their author" equations would mean if they were to have such equations in front of their eyes. In my paper, I have been able for the first time to obtain some analytically-exact quantum field equation which are
non-linear, based on the up-to-G^4 terms of classical Yang-Mills theory. And because of that, I have been the first person in the world to my knowledge who has has had to struggle through deciphering what these non-linear equations are teaching. And as best I can tell, all of the non-locality that people struggle with in quantum theory comes whooshing in as soon as one starts to apply these non-linear quantum field equations to such things as the slit experiments. And because this happens, that tells me that these equations are on the right track. And it also tell me that I need to be talking to you all who have been hotly debating locality and non-locality for as long as I have been a moderator and participant of this group.
How did I manage to find myself in this position? While I started this paper with the thesis that baryons are Yang-Mills magnetic monopoles which I adhere to strongly and have empirically supported by successfully retrodicting fifteen light nuclear binding energies from hydrogen through oxygen and the proton and neutron rest masses as previously posted and discussed at length in this space, the emergence of the non-linear analytical quantum field equations was
entirely independent of the baryon / monopole thesis. Simply put: I figured out how to solve the Gaussian integral which has the form Ax^4 + Bx^3 + Cx^2 + Dx + E in the action,
for the specific form that this polynomial takes on in the Yang-Mills gauge theories which are widely-accepted to govern the weak and strong interactions. I do this via a recursion which I first uncover in section 8 of my paper, and which I then apply to exactly and analytically perform the complete Yang-Mills path integral in section 11 of my paper. That result -- which solves the mathematical problem that had previously been considered intractable-- is equation (11.5). Put plainly, sections 8 and 11 are a breakthrough in the
mathematics of
exactly and analytically applying the
physics of path integration to non-linear field theories. Later refined versions of (11.5) are in equations (13.20) and (13.21), with the amplitude / action density M(J) defined from W(J) in the first line after (13.6).
From there, it is on to applying these equations. When the W(J) becomes divided by time to obtain an E(J)=W(J)/time as occurs in some later calculations, and then we develop all of this in
time-independent fashion, I end up with an energy E(J) which in the simplest case where the source J is a Dirac delta, is identically synonymous with the Coulomb potential, as developed mainly in sections 16 and 19. (I first developed the time-independent case just to keep life simple in the opening stages of dealing with a non-linear quantum field equation -- I would expect the
time-dependent development to tell us some interesting things about signal propagation speeds like how a change in slit configuration propagates out to inform the rest of the world that the slits are changed.) Beyond believing that W(J) and thus W(J) / time is real in the EPR sense because I am a believer in the reality in the EPR sense of what one gets out of a path integration, the correspondence with Coulomb when the source is postulated to be a Dirac delta is what convinces me that this potential is very, very real in the EPR sense. (I have left out how I get from sources J to probability densities. That too is a trek worthy of its own story in sections 14 and 15. But for now, I simply remind you that in Dirac theory, the time component J^0 of a current density four-vector is a probability density.) So when I then take this potential and apply it to more complicated probability densities like those for the single and double slit experiments, I believe that the potentials I derive there must be just as EPR-real as the Coulomb potential. Then, when I see that these potentials to which I have ascribed this EPR reality
seem to require some non-locality, I take this as a signal that these equations are doing something right, I know that I have plunged into the quantum quagmire that all of you have debated here forever, and that is again why I came here for help.
Final note: Like any attentive author, when I write something down to try to teach it to others, as a byproduct I teach myself more than I knew when I started writing. In writing this and giving emphasis to the fact that this is a
non-linear quantum field theory, I remind myself that these field quanta passing through slits are doing so in a non-linear way. This has made me more believing, not less, that Fred was on the right track when he mentioned "virtual photons," at least "in spirit," as perhaps a way to explain the slit experiments without resort to non-locality. If the quantum potential is affected by the field quanta as it clearly is (will discuss why in a later PART), but the theory is non-linear, then the potential must itself affect the potential, and this means that the potential around the electron as the electron goes through one slit will affect the potential at the other slit because of the non-linearity. And if that happens, and the slits also affect the potentials as its would seem they must (remember, these are
quantum potentials -- all the usual classical ways of thinking about a potential -- such as what happens with an insulator -- are changed), then you could have a field quantum interfering with itself,
not by going through two slits which ain't in the cards, but by activating a non-linear cascade in the potential which can reach over to and propagate through the other slit and then condition the guiding potential on the other side of the slits. Stay tuned, still "cooking" that one; if it flies, Fred gets an acknowledgement.
That should do it for PART I.
Jay