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Quantum Physics

- Mathematical description of the motion and interaction of subatomic particles. Quantum Mechanics & Field Theory
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Jan16-12 Greg Bernhardt
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:38 AM
ZapperZ
1 35,521
Hey all. So, I understand that every bound electronic state will have zero average electronic momentum, because...
Aug10-10 03:25 PM
ani4physics
8 1,243
Of course every prove of this type have some mistake. If nobody will see I will post solution! \hat{A}, \hat{B}...
Aug10-10 03:23 AM
Petr Mugver
28 3,119
Got an idea for something that I think with the abundance of bright minds here I will find the oversight that makes...
Aug10-10 01:37 AM
AshsZ
4 975
I have looked at several derivations of the Schrodinger equation but the one I like the best is from Piravonu Mathews...
Aug9-10 12:57 AM
Nemanja989
6 3,227
Is position not an observable of a photon?
Aug8-10 07:38 PM
Fwiffo
37 4,860
why is there an upper limit to the photon energy that can be observed in the emission spectrum of the hydrogen atom?
Aug8-10 06:59 PM
Eudoxie
2 3,200
In proving the Ehrenfest Theorem This is the typical first line: \frac{d }{dt}<O> = \frac{\partial}{\partial t}...
Aug8-10 06:52 PM
facenian
1 1,181
Hi all. I have been thinking about this problem for quite a while now. Still kinda clueless. We know that when we...
Aug8-10 10:17 AM
ani4physics
9 1,486
Hello, I would like to ask if there is a standard explanation of decoherence in the universe as a whole. I can see...
Aug8-10 08:18 AM
RUTA
29 2,414
I got some good responses to my last thread on here I thought I'd try one more. I'm wondering about the multiverse...
Aug7-10 07:37 PM
Xtensity
2 1,897
This is taken from a text problem, but I am putting it in this section because I think my question goes beyond the...
Aug7-10 03:00 PM
Petr Mugver
4 1,439
Every resource I can find that discusses the Aharonov-Bohm effect states that the phase shift in SI units is given by...
Aug6-10 07:40 PM
ballzac
7 910
Can two objects overlap in space-time? Why or Why not? If so, what circumstances must exist? If not, by what mechanism...
Aug6-10 05:10 PM
stevmg
5 2,537
I know if energy just suddenly appears in a vacuum it will become radiation in some random form of...
Aug6-10 03:31 PM
Šquark
2 1,174
I lack the fundamental aspect of quantum entanglement and I am trying to fully understand it. The problem I have is...
Aug6-10 02:58 PM
adriank
8 1,275
Say you want to evaluate this integral: \int^{\infty}_{-\infty} \frac{dx}{x^2-A} Since the bottom factors into...
Aug5-10 10:42 PM
RedX
5 1,552
My question is about which properties a particle can be said to possess. I understand that in accordance with...
Aug5-10 01:09 PM
eloheim
18 2,799
Virtual particles confuse me a bit, because although the ones which exist for such short times in Feynman diagrams...
Aug5-10 11:59 AM
kexue
1 1,206
Dear all, I was wondering if the following formula is correct or not: = \otimes where A, B, C, D are...
Aug4-10 10:02 PM
ismaili
0 637
Hi, I have a question which I've been pondering over and would like to have an anwser to. I'm not schooled in physics...
Aug4-10 08:07 PM
unusualname
1 1,103
This may be more of a maths question, but because I may actually just be interpreting the expression wrong, I think...
Aug4-10 06:26 PM
NanakiXIII
2 999
Can anybody help me out with equation 9.25 in Srednicki's QFT book? He says the in the eq. 9.25 an integration by...
Aug4-10 04:40 PM
kexue
3 1,159
Hi, I am not a physicist. I am trying to understand something about the behaviour of materials for computer...
Aug4-10 12:07 PM
The_Duck
1 1,380
I understand that if you move a charged particle, you can create a photon, the basic unit of electromagnetic energy. ...
Aug4-10 10:58 AM
dcwarrior
0 1,189
I am hoping it may be helpful to separate Bell's logic from Bell's mathematics ...
Aug3-10 08:47 AM
DrChinese
215 21,462
According to quantum physics energy only exists in small pockets of energy called quantum-or something like that,I...
Aug3-10 08:42 AM
tom.stoer
51 9,020
If the cells in our body (including brain cells) are replaced every 7 years, then in a sense we should be completely...
Aug3-10 12:19 AM
Lok
7 1,255
This relates to Doppler's effect. The phenomenon: It is quite simple and says that light emitted from a moving...
Aug2-10 02:28 PM
tom.stoer
3 1,915
Can someone tell me what mass is other than particles with mass react to a gravitational field? Electrons and photons...
Aug2-10 05:22 AM
kexue
10 1,440
Im reading in a quatum mechanics book and need help to show the following relationship, (please show all the steps): ...
Aug1-10 07:51 PM
ismaili
2 2,151
Any measurement device used to witness the phenomenom seems like it would disrupt quantum entanglement. How do...
Aug1-10 07:40 AM
DevilsAvocado
2 2,846
Does the basic geometry of packing differ with more fundamental particles?
Aug1-10 01:00 AM
Loren Booda
0 742
Hey folks, I'm trying to understand a couple of calculations in Chern-Simons theory and I'm stuck. I want to prove...
Jul31-10 11:14 PM
weejee
1 1,180
I am confused as to how the mass equivalence of the the 3 gluons in at nucleon can give rise to an increase in the...
Jul31-10 03:22 PM
cbd1
19 2,453
I know It is not EM wave. It is not probablity wave since probablity can never be negative. But I think De...
Jul31-10 10:42 AM
munaizag
7 5,237
position,velocity cannot be found simultaneously with appreciable accuracy,why is it so?
Jul31-10 08:00 AM
adaptation
6 1,276
To begin, I am an avid physics enthusiast and after reading countless books, there are a few questions that pester me...
Jul31-10 12:22 AM
J.W. Coleman
3 828
Hello everyone, I recently found this forum and have a question about spooky entanglement. When I first heard of...
Jul30-10 08:56 PM
QuarkCharmer
1 716
Hi, for my exam i"m re-reading Peskin&Schroeder and stumbled across equations 2.21-2.25 where the canonical...
Jul30-10 08:06 PM
ismaili
19 2,440
Qm and SR ( 1 2 3)
Acc. to QM no two particles can be in the same state at the same position at the same time, but how does that...
Jul30-10 07:48 PM
Fwiffo
51 4,445

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