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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 36,440
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 1,219
Hi all, Quantum Mechanics has everything wierd and unacceptable to classical theory and its foundations with...
Mar21-12 12:21 AM
andresB
24 2,542
In quantum mechanics, the Hamilltonian operator is constructed as the infinitesimal generator of the time translation...
Mar21-12 02:40 AM
Ilmrak
69 5,757
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 1,306
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 3,237
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
5 813
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
0 544
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
3 864
I am trying to understand the following equation:...
Mar22-12 02:09 AM
avery
2 853
Hello, For this little discussion I base myself on Bell's paper on Bertlmann's socks:...
Mar22-12 05:36 AM
harrylin
97 9,268
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
1 875
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
3 782
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
0 707
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
0 721
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 1,981
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
0 630
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 1,693
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
0 750
Which material contains highest concentration of free electrons and holes simutaneously at room temperature and could...
Mar22-12 07:34 PM
Stanley514
0 965
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 1,113
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
1 565
If the positive energy is the capacity to perform work what about the negative energy?
Mar23-12 08:52 AM
Khashishi
2 910
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
2 674
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
2 913
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
1 702
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
3 965
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
4 996
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
1 799
the electrical activity of an atom is the same electricity of a light bulb?
Mar24-12 03:34 PM
mathman
3 713
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
2 690
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 1,412
Hey Given an anisotropic hamiltonian \mathcal{H} = -\sum_{j,\rho} \left( J_\rho^z s_j^z s_{j+\rho}^z +...
Mar25-12 09:56 AM
JohnGringo
0 733
I have seen an argument that the time-energy uncertainty relation allows heavy particles to exist for short periods of...
Mar25-12 01:39 PM
Jano L.
3 1,082
Assume the universe consists of a single photon, a single atom of hydrogen and a spherical detector (like an...
Mar25-12 02:09 PM
Jano L.
3 762
In a Mach–Zehnder interferometer experiment, can you measure which path the beam took by measuring the change in...
Mar25-12 05:59 PM
lugita15
7 1,264
When I read about the uncertainty principle, I keep reading about these experiments where they fire electrons through...
Mar25-12 06:00 PM
mycotheology
0 768
Physicist say "Quantum Entanglement is when you place 2 electrons together. They Vibrate in Unison. When you take...
Mar26-12 02:28 AM
gogo_t
28 3,057
A mathematical statement of energy conservation can be given using the continuity equation in terms of the total...
Mar26-12 08:11 AM
Jano L.
8 1,265
When I read about entanglement it is described as the singlet state two particles (or eventually even molecules) are...
Mar26-12 09:05 AM
DrChinese
4 802
How much stronger is the strong nuclear force compared it to the electromagnetic force beyond what could be accounted...
Mar26-12 09:40 AM
DrChinese
1 2,271

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