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Quantum Physics

- Mathematical description of the motion and interaction of subatomic particles. Quantum Mechanics & Field Theory
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Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:38 AM
1 30,369
By looking at layman's books on physics I have picked up the idea that "virtual" particle-antiparticle pairs...
Apr10-12 09:20 AM
1 535
Brian Greene describe an experiment in his book "The fabric of the cosmos" pretending to illustrate the Bell test...
Apr10-12 04:38 AM
17 3,093
say you overlap two identical coherent light beams with a mirror but opposite phase so they effectively cancel each...
Apr9-12 09:11 PM
Vanadium 50
19 1,482
I have seen the ∂ symbol many times in wave function equations. What does it mean?
Apr9-12 05:10 PM
1 901
I know even molecules can be used and the result still emerges. What is the density of of atoms or molecules when...
Apr9-12 04:23 PM
15 2,158
In regards to this article -...
Apr9-12 02:57 PM
0 752
I know, I know, it might be a little bit spam-y to post another poll, but since the option 'Other' was gaining so much...
Apr9-12 10:40 AM
29 2,905
Hello, I am writing an appendix to my thesis where i try to explain how nmr works but i am having trouble...
Apr9-12 10:11 AM
2 921
At classical harmonic oscillator, total energy is proportional to square of frequency, but at quantum harmonic...
Apr9-12 09:12 AM
2 990
Hello! On p.424 in the second edition of Altland & Simons, they compute an average as part of a renormalization...
Apr9-12 08:23 AM
0 613
3 years ago when I lived in Jordan I met a Palestinian who believed that he had unified gravity with quantum...
Apr9-12 07:33 AM
Mark M
5 1,136
How many chemical shift measurements must be used to elucidate the structure of organic questions?????? I found this...
Apr9-12 03:09 AM
0 653
In non-relativistic QM, we spend a lot of time examining bound states--energy levels, spatial distributions, and all...
Apr8-12 10:19 PM
1 772
im currently writing a paper for one of my classes, and part of that paper requires me to "Discuss also the question...
Apr8-12 09:01 PM
2 1,061
Is there fixed data for the threshold frequency of metals? For example, is it possible to find out the threshold...
Apr8-12 06:17 PM
4 6,368
Hello, I've been reading a book on QCD on I have a question: what is the purpose of the renormalization group? Is...
Apr8-12 05:07 PM
3 905
Hi, I'm doing a homework problem in my modern physics class and I'm stuck at a point. The question is "Show that...
Apr8-12 04:29 PM
Bob S
8 1,943
So if light acts like waves when interacting with huge objects and acts like regular particles when interacting with...
Apr8-12 01:51 PM
2 794
I am given the vibrational frequency of hydrogen, and I am asked to calculate the one for OH making certain...
Apr8-12 10:05 AM
0 534
Hi friends. I'm doing a homework problem about how degenerate orbitals split in the presence of a magnetic field. I...
Apr8-12 03:15 AM
M Quack
1 620
From the postulates of QM we know that any state |ψ> is the same as exp(iθ)|ψ>. Ok so take the spin state of an...
Apr7-12 04:40 PM
5 866
let be N(x)= \sum_{n} H(x-E_{n}) the eingenvalue 'staircase' function and let be a system so V(x)=V(-x) and ...
Apr7-12 04:39 PM
0 608
I can understand the whole mathematics in this effect. The thing that i could understand is the production of new...
Apr7-12 03:54 PM
3 907
Hey! I have started reading about anyons in a book called fractional statistics and quantum theory. In this book...
Apr7-12 01:25 PM
13 1,415
I am reading a paper from Yakir Aharonov and others revisiting Hardy's paradox and I have a question. Let me state...
Apr7-12 12:35 PM
1 730
Hi all. Just a quick question, probably a silly one. Due to wave-particle duality all particles have both...
Apr7-12 10:44 AM
Einstein Mcfly
1 700
this has been asked by someone before, though, but, i think, never got answered can the matter waves of, say, a...
Apr7-12 07:23 AM
1 578
in the various QM experiments: after select event(s) have occured, we assume collapse of wave function and the...
Apr7-12 01:01 AM
3 883
I've been trying to read Bargmann's 1964 proof of Wigner's theorem, but I find it really hard to follow. This is the...
Apr6-12 11:37 PM
12 2,151
Hi all! I've got a question concerning Wick's theorem. I followed the proof in the book by Fetter and Walecka and it...
Apr6-12 07:51 PM
0 920
Please I need help from anybody who knows how to use the DWBA program, DWUCK5. I'm finding it difficult to specify the...
Apr6-12 05:47 PM
0 756
With regards to the photoelectric effect the wave theory does not match up to observations of instantaneous emission...
Apr6-12 05:02 PM
10 1,351
Hello, I am studying the Wigner-Eckart theorem and I have found some difficulties understanding the reduced matrix...
Apr6-12 02:28 PM
0 921
Hi I am working my way through Griffith's Introduction To Quantum Mechanics and I have got to the section on...
Apr6-12 01:42 PM
3 941
from my thinking nonlocality and entanglement are never a problem because in a totally determinstic universe, the...
Apr6-12 01:07 PM
395 24,274
Hello, I am not educated in physics, but I would like to gain some understanding on the double-slit experiment. I...
Apr5-12 04:19 PM
70 6,658
Hi, I'm trying to calculate the thermal equilibrium expectation value of the displacement operator, i.e: tr(\rho...
Apr5-12 01:28 PM
0 890
If |ψ> is the state of a system of two indistinguishable particles, then we have an exchange operator P which switches...
Apr5-12 09:57 AM
3 684
I was just wondering that when we have a molecule, and you introduce heat, the molecule starts to get translation,...
Apr5-12 09:22 AM
4 659
If I give you a box, completely empty except for one hydrogen atom, could you theoretically measure the spin of its...
Apr5-12 08:58 AM
5 860

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