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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 30,462
I was doing some reasearch on electrons, and I found that they have both particle and wave like characteristics. Is...
Mar19-12 08:19 AM
jtbell
2 807
This set of equations has been going around on the /sci/ boards of 4chan lately, but hardly anybody there knows what...
Mar19-12 11:02 AM
ThomasT
3 1,068
I have a doubt making a little of thinking of basic notions of QM and I think that the answer should be very simple...
Mar19-12 05:02 PM
The_Duck
2 654
Where http://upload.wikimedia.org/wikipedia/en/math/0/a/1/0a1c02498125a255a2f5b0e58908a8ae.png How did he come up...
Mar20-12 05:05 AM
genericusrnme
13 1,357
Please teach me this: Why do we only consider symmetry group(Lie group and Lie algebras) but not general symmetry(the...
Mar20-12 06:07 AM
A. Neumaier
29 2,909
This is an extract from the lecture notes I took for the 'Foundations of QM' third year course. Copenhagen QM ...
Mar20-12 10:44 AM
Khashishi
8 1,776
Hi folks. I'm wondering who does a good job of explaining this limit, preferably with a good set of examples. It...
Mar20-12 11:51 AM
genericusrnme
1 890
Obviously a violation of the CHSH inequality means that local realistic theories are untenable. If we sent two...
Mar20-12 10:20 PM
StevieTNZ
8 1,159
I think I have a pretty good handle on how scalar field scattering works in QFT, so now I'm trying to wrap my head...
Mar20-12 10:45 PM
Chopin
2 901
hi all please help me... I'm learning schrodinger equation of a particle in a 1-dimensional box. I read a quantum...
Mar20-12 11:23 PM
Chopin
1 1,130
Hi all, Quantum Mechanics has everything wierd and unacceptable to classical theory and its foundations with...
Mar21-12 12:21 AM
andresB
24 2,323
In quantum mechanics, the Hamilltonian operator is constructed as the infinitesimal generator of the time translation...
Mar21-12 02:40 AM
Ilmrak
69 5,255
Greetings!! From my last post, to this my understanding of QM has improved somewhat. (thanks mostly to these...
Mar21-12 04:54 AM
genericusrnme
5 1,217
I am terribly confused. I have always been hearing that in the hydrogen atom, 2s and 2p orbitals have the same energy....
Mar21-12 07:55 AM
Vanadium 50
5 2,933
Hi, it's been awhile since taking a quantum mechanics course, but I thought I read somewhere that during an electron...
Mar21-12 01:35 PM
jjurbanus
5 766
More precisely, my question is, Is the wilson loop used to calculate the heavy quark potential always positive in the...
Mar22-12 12:19 AM
sufive
0 507
does getting which-way info introduce a phase difference (or cause de-coherence) between both the "waves"? and does...
Mar22-12 01:41 AM
genericusrnme
3 798
I am trying to understand the following equation:...
Mar22-12 02:09 AM
avery
2 781
Hello, For this little discussion I base myself on Bell's paper on Bertlmann's socks:...
Mar22-12 05:36 AM
harrylin
97 8,511
Dear forumers, I have a question about taking direct sums and products of state spaces in QM. Picture I have a...
Mar22-12 09:52 AM
martinbn
1 709
Hey! I am currently reading Landau's Statistical Physics Part 1, and in Paragraph 7 ("Entropy") I am struggling with a...
Mar22-12 10:10 AM
marcusl
3 698
Considering the strong-field zeeman effect J is no longer conserved because there is an external torque present. Why...
Mar22-12 01:10 PM
BramMooij
0 577
Well, not really ASAP.. I've just been rereading Sakurais Quantum Mechanics and I'm having some trouble with the...
Mar22-12 01:47 PM
genericusrnme
0 686
How can the Higgs boson induce mass? How can it interact with itself? Is it the only particle able to do so, if yes,...
Mar22-12 03:32 PM
The_Duck
3 1,336
sorry if it is in the wrong place but i just need someone to give me a physical explaination about the meaning and...
Mar22-12 04:18 PM
queenstudy
0 605
Couple noob questions. 1.What is quantum mechanical definition of an observer? 2.Why is looking at the double...
Mar22-12 04:59 PM
JamesOrland
17 1,515
I was wondering if trapping a quantum system, say e.g a single β or γ unstable ion in a trap would affect its decay...
Mar22-12 05:35 PM
xaratustra
0 708
Which material contains highest concentration of free electrons and holes simutaneously at room temperature and could...
Mar22-12 07:34 PM
Stanley514
0 824
How would a neutrino act in regards to a black hole? As in approaching, passing by or "colliding" with a black hole?
Mar22-12 11:30 PM
alexg
5 1,003
Could anyone tell me where can i find more about the fact that if your Hamiltonian is non-central then the total...
Mar23-12 07:56 AM
cgk
1 538
If the positive energy is the capacity to perform work what about the negative energy?
Mar23-12 08:52 AM
Khashishi
2 863
Why is it that for the H-atom there is no single photon emission in the transition from 2s to 1s? I realize that...
Mar23-12 12:38 PM
Demon117
2 642
Zee's QFT in a Nutshell makes a short comment in the first chapter about the possibility of particles tunnelling...
Mar23-12 02:43 PM
Bill_K
2 859
If a photon is a particle moving like a wave, and the color we see when viewing a stream of photons is determined by...
Mar23-12 08:08 PM
francesco85
1 659
Hello, i am a complete ignorant in quantum physics, still from what i have heard i've wondered the following: is it...
Mar23-12 10:22 PM
StevieTNZ
3 892
I know a fair amount of theoretical Quantum Physics, how things work within it, and the ideas that ground it. I lack,...
Mar23-12 10:33 PM
Jolb
4 899
Anyone keen on taking a bite at this? I understand what it's about (at least I think so), but I am certainly not...
Mar24-12 09:17 AM
jimgraber
1 743
the electrical activity of an atom is the same electricity of a light bulb?
Mar24-12 03:34 PM
mathman
3 673
Hi In my lecture notes on quantum optics is a reference to a "c-number" electric field, and it is stated that,...
Mar24-12 04:17 PM
Niles
2 662
As I understand (from reading p. 2-06 of Marle's 1975 text on geometric quantization available on the french wiki page...
Mar25-12 09:37 AM
fzero
9 1,296

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