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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
ZapperZ
1 30,380
At first let's take a look at the eigenvalue problem for the momentum operator in x-representation. -i \hbar...
Jan4-13 10:34 PM
strangerep
11 1,045
It had been asked before on physics forums but the given answers didn't convince me .
Jan4-13 05:22 PM
strangerep
22 1,994
It is not hard to show that for QM what takes the wave function from t->t+Δt is the exponential of the hamiltonian....
Jan4-13 03:20 PM
jfy4
3 672
does not occur because the probabilities are of the magnitude of exp, give or take a few decimal places, correct? i.e....
Jan4-13 01:27 PM
I2004
25 3,891
I'm sorry if this has already been completed or already discussed. If so, just link me to answer the question,...
Jan4-13 07:37 AM
Nugatory
1 652
The expansion theorem in quantum mechanics states that a general state of a system can be represented by a unique...
Jan4-13 04:50 AM
Chain
4 534
Hello, is it possible to reproduce the double slit experiment at home with some easily obtainable equipment? I was...
Jan3-13 04:11 PM
Pitullie Paul
32 27,537
Iíve heard in several places that we must view the spin of subatomic particles not as we would that of a classical...
Jan3-13 04:09 PM
DiracPool
24 3,843
Morrobay suggested we split off this discussion from another thread. I will post my summary of the EPR definition a...
Jan3-13 03:44 PM
berkeman
22 1,669
Hi there, I've a few (probably very basic) questions about photon-electron (light-matter) interactions. Here we go:...
Jan3-13 10:46 AM
110010
8 905
Hi, Let's say I have a creation operator that creates a photon in some spatial mode. It has a spectral distribution...
Jan3-13 09:15 AM
McLaren Rulez
2 444
I'm a bit confused by something Peskin & Schroeder say about differential cross sections. In my printing, this is on...
Jan3-13 09:04 AM
alemsalem
4 799
I tried looking it up but I can't understand it. Is the graviton some kind of theoretical particle that gives of...
Jan3-13 08:08 AM
Naty1
22 1,797
Hi. First of all English is not my native language and i am a layperson, so I hope i can explain my self. It is...
Jan3-13 02:40 AM
bhobba
5 860
Have you recently came across and remember titles of papers about real experiments concerning the famous double slit...
Jan2-13 08:49 PM
Cthugha
3 883
Hi, I am trying to write down the propagator for a scalar field theory, but I want to try and get it in the...
Jan2-13 11:37 AM
xepma
5 725
For Wigner transforming the function of operators x and p : (xp+px)/2 we need to evaluate something like: g(x,p) =...
Jan2-13 09:49 AM
aim1732
6 779
Consider two hermitian operators A and B. Imagine a system is in state |\psi\rangle ,then we have: \langle...
Jan2-13 04:17 AM
dextercioby
49 4,139
Hey, I have the following question on Hermitian operators http://i.imgur.com/yDaz3.png Initially I thought...
Jan2-13 04:05 AM
aim1732
9 1,017
Hi all, One more question about the Unruh effect, i.e., that an accelerating observer will see a vacuum filled with...
Jan1-13 10:29 PM
asimov42
10 1,190
I am just an interested high school physics student so I don't really know much about the subject, but I am given to...
Jan1-13 05:35 PM
DiracPool
18 2,488
Consider a nonrelativistic electron in one dimension, with the potential V(x)=\left\{ \begin{matrix} \infty,...
Jan1-13 04:54 PM
Vanadium 50
10 1,295
This has been a contradiction in my brain for some time. If I want to rotate one nuclei (spin 1/2), with say an...
Jan1-13 02:40 PM
haibane90
5 896
I'm actually quite scared of asking this due to my very basic knowledge regarding Quantum Mechanics. Actually, this is...
Jan1-13 09:15 AM
dextercioby
7 1,100
http://books.google.co.uk/books?id=rcrf0P8DSe0C&pg=PA159&lpg=PA159&dq=how+quantum+field+theory+is+possible+are+field+qu...
Dec31-12 10:26 PM
sshai45
3 831
I'm attempting to solve the particle-in-a-box problem using Scipy (with the help of...
Dec31-12 09:29 PM
Draksis314
0 507
I know there are four different forces in the universe and they all affect us. I know that gravity is the force of...
Dec31-12 07:54 PM
dbmorpher
5 985
I'm working with flow equations right now and have been stuck on this one part (I'm re-doing the work of one of my...
Dec31-12 12:40 PM
faceforest
0 447
Is there some resource on the net where I can find images of electron orbitals for dihydrogen (H2), helium (He),...
Dec31-12 11:29 AM
berkeman
22 2,286
I'm just curious, but I've been reading about Transactional Interpretation For some time now and I know about the law...
Dec31-12 03:37 AM
andrien
1 442
In the two slit experiment when which path information is present there is no wave interference pattern such as would...
Dec30-12 01:13 PM
San K
2 624
Do you need a magnetic field for EIT, or just two electromagnetic beams with the right attributes? Thanks, Jake
Dec30-12 10:54 AM
mfb
3 512
Is there some fundamental fact of the universe (Quantum Mechanics) that prevents us from removing noise (without...
Dec30-12 08:45 AM
San K
10 946
It is said that : electrodynamics is a gauge theory for U(1) gauge group . what is its physical concept?...
Dec30-12 07:40 AM
andrien
5 879
I just came across the following Quote in an introductory Quantum physics book"There are certain experiments in which...
Dec30-12 07:20 AM
andrien
3 614
Is there still hope for a rational quantum mechanics? Double slit: http://www.youtube.com/watch?v=W9yWv5dqSKk ...
Dec29-12 10:34 PM
dlgoff
1 534
I'm starting to read Brian Cox Quantum Universe. Has anyone read it already? Which part of it could be false? I wonder...
Dec29-12 08:11 PM
Tomahoc
0 563
I have been looking for experiments demonstrating neutron interferomerty with protons or electrons instead, and found...
Dec29-12 04:27 PM
Vanadium 50
5 593
Hi. I have a little question. In some of my books you can read that the author keeps saying that an electron is...
Dec29-12 12:56 PM
haael
2 572
Hi I was day dreaming the other day when I realized how incomplete and vague the fundamental postulates of QM are, I...
Dec29-12 12:42 PM
jfy4
3 746

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