Advanced Quantum Mechanics Lecture 9

Originally presented by the Stanford Continuing Studies Program.

Stanford University:

Continuing Studies Program:

Stanford University Channel on YouTube:

[洪瑜隆]

I just could not stop watching From one lecture to another lecture. I am watching addictively. In Every lecture, I really want to applause but it will wake my wife up in the midnight.

[aeroscience]

30:47 "I'm not gonna give them names, I'm gonna call them A and B, you can call them proton and electron if you like" proceeds to call them electrons. Classic Leonard

[joabrosenberg]

Quantum Field Hamiltonian; The mass element 4:20; Momentum conservation 7:30; Two particles Hamiltonian interaction 30:00; The coupling constant 39:00; Making the Hamiltonian Hermitian requires the symmetry 41:30; Second component of H**2 46:00; Feynman Diagrams 58:00; Dirac equation 1:05:00

[gustavoaroeira]

It is universal. Every class has someone that won't stop trying to show off.

[NuclearCraftMod]

A fantastic introduction to the Dirac Equation (starting at 1:05:19)! Every lecture is great, but this part in particular was both fascinating and incredibly well explained - well done once again, Professor :)

[hasanshirazi]

0:00 - 1:05:30 Hamiltonian for QF
1:05:30 - Dirac Equation (Relativistic Effects in QM)

[petergreen]

❤Thank you very much Professor and class

[LydellAaron]

1:01:58 was a very helpful takeaway. Think of the diagram as calculating term e^(iht) by expanding it out?

[KipIngram]

38:20 - Is it fair to say that in quantum field theory you don't "calculate what happens" so much as you "propose what happens and find the probability associated with that happening"?

[gruminatorII]

This may sound stupid, but i don't know why the usual time evolution e^-i H t not work here.

[KipIngram]

1:00:36 - This guy with the high-pitched voice talks entirely too much. He clearly thinks the whole situation should be revolving around him. So disrespectful to his fellow students, and for that matter to Dr. Susskind.

[schmetterling]

I don't know why Stanford calls this "advanced quantum mechanics". This is barely beginner's course level.

[KipIngram]

1:33:00 - High pitch voice guy: SHUT UP.

[charlesbrightman]

"IF" my latest theoretical idea concerning the Theory Of Everything (TOE) is even somewhat true, then "particles" don't even exist at this very low level of reality. Everything would basically be interacting field energies, potentially interacting pulsating photons.

REVISED TOE: 9/22/2016.
My Current TOE:

THE SETUP:
1. Modern science currently recognizes four forces of nature: The strong nuclear force, the weak nuclear force, gravity, and electromagnetism.
2. In school we are taught that with magnetism, opposite polarities attract and like polarities repel. But inside the arc of a large horseshoe magnet it's the other way around, like polarities attract and opposite polarities repel. (I have proved this to myself with magnets and anybody with a large horseshoe magnet and two smaller bar magnets can easily prove this to yourself too).
3. Charged particles have an associated magnetic field with them.
4. Protons and electrons are charged particles and have their associated magnetic fields with them.
5. Photons also have both an electric and a magnetic component to them.

FOUR FORCES OF NATURE DOWN INTO TWO:
6. When an electron is in close proximity to the nucleus, it would basically generate a 360 degree spherical magnetic field.
7. Like charged protons would stick together inside of this magnetic field, while simultaneously repelling opposite charged electrons inside this magnetic field, while simultaneously attracting the opposite charged electrons across the inner portion of the electron's moving magnetic field.
8. There are probably no such thing as "gluons" in actual reality.
9. The strong nuclear force and the weak nuclear force are probably derivatives of the electro-magnetic field interactions between electrons and protons.
10. The nucleus is probably an electro-magnetic field boundary.
11. Quarks also supposedly have a charge to them and then would also most likely have electro-magnetic fields associated with them, possibly a different arrangement for each of the six different type of quarks.
12. The interactions between the quarks EM forces are how and why protons and neutrons formulate as well as how and why protons and neutrons stay inside of the nucleus and do not just pass through as neutrinos do.

THE GEM FORCE INTERACTIONS AND QUANTA:
13. Personally, I currently believe that the directional force in photons is "gravity".
14. I also believe that a pulsating singularity (which is basically a pulsating photon) is the pure energy unit.
15. When these pulsating pure energy units interact with other pure energy units, they tangle together. Various shapes (strings, spheres, whatever) might be formed, which then create sub-atomic material, atoms, molecules, and everything in existence in this universe.
16. When the pure energy units unite together they would tend to stabilize and vibrate.
17. I believe there is probably a Photonic Theory Of The Atomic Structure.
18. Everything is basically "light" (photons) in a universe entirely filled with "light" (photons).

THE MAGNETIC FORCE SPECIFICALLY:
19. When the electron with it's associated magnetic field goes around the proton with it's associated magnetic field, internal and external energy oscillations are set up.
20. When more than one atom is involved, and these energy frequencies align, they add together, specifically the magnetic field frequency.
21. I currently believe that this is where a line of flux originates from, aligned magnetic field frequencies.

NOTES:
22. The Earth can be looked at as being a massive singular interacting photon with it's magnetic field, electrical surface field, and gravity, all three photonic forces all being 90 degrees from each other.
23. The flat spiral galaxy can be looked at as being a massive singular interacting photon with it's magnetic fields on each side of the plane of matter, the electrical field along the plane of matter, and gravity being directed towards the galactic center's black hole where the gravitational forces would meet, all three photonic forces all being 90 degrees from each other.
24. As below in the singularity, as above in the galaxy and probably universe as well.
25. I believe there are only two forces of nature, Gravity and EM, (GEM). Due to the stability of the GEM with the pure energy unit, this is also why the forces of nature haven't evolved by now. Of which with the current theory of understanding, how come the forces of nature haven't evolved by now since the original conditions acting upon the singularity aren't acting upon them like they originally were, billions of years have supposedly elapsed, in a universe that continues to expand and cool, with energy that could not be created nor destroyed would be getting less and less dense? My theory would seem to make more sense if in fact it is really true. I really wonder if it is in fact really true.
26. And the universe would be expanding due to these pulsating and interacting pure energy units and would also allow galaxies to collide, of which, how could galaxies ever collide if they are all speeding away from each other like is currently taught?

DISCLAIMER:
27. As I as well as all of humanity truly do not know what we do not know, the above certainly could be wrong. It would have to be proved or disproved to know for more certainty.