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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
1 36,357
If I set up an interference experiment and make one path much longer than the other would I still see an interference...
Feb9-06 05:53 AM
1 1,251
I was reading some some popular science rags and came across an article that espoused: But I didn't think all...
Feb12-06 04:07 PM
0 2,489
I'm working on a research paper on Quantum Entanglement and came across something I don't understand. (I assume this...
Dec17-09 11:21 PM
8 2,001
Feb14-13 02:39 AM
0 372
Before I make my post, I'd just like to introduce myself. My nickname is quantum_foam, as you can see (it's from the...
Nov8-03 11:35 PM
4 1,248
In F. Wilczeks book, The Lightness of Being he describes his theory on the origin of mass. He explains, in much more...
Jan10-09 01:56 PM
2 810
OK, I have a problem with the many-world interpretation, namely the quantum suicide experiment. My problem: How...
Jun28-06 11:32 PM
58 7,986
Imagine you have two plates which can either be perfectly conducting or perfectly insulating by changing some...
Nov5-06 07:34 PM
8 1,914
I am reading chapter three of Huang's Statistical Mechanics and I have a problem with equation (3.22). Having...
May19-12 08:03 AM
2 589
I am told that when an atom absorbs a photon, it jumps up an energy level, these are discrete levels of energy etc...
Apr7-11 07:41 PM
Einstein Mcfly
3 864
Hi, I have a ground state wavefunction, $$ \psi_0(\xi) = A_0\exp(-\frac{1}{2}\alpha\xi^2), $$ (##\alpha## is a...
Dec13-13 07:45 AM
0 384
Since it appears (so far) I am infringing no rule, here is another shameless copy/paste of a thread I started on...
Oct24-08 06:19 PM
1 1,174
Hi In double slit experiment our observe can change the past and in the entanglement our observe affact other...
Dec13-13 09:44 AM
10 750
Spin is a quantity of vector but I dont know how to add them ? Please be simple Thanks
Aug14-14 09:19 AM
2 165
I watched a video about particle physics and there I saw something strange(for me)...
Aug18-14 02:18 AM
6 369
Why is there no kinetic energy term in said hamiltonian? Suppose I take a magnetic dipole in my hand, and I throw it...
Dec24-05 11:17 AM
3 6,286
I've always wondered what is considered to be 1 photon. We always see things like "When two of these particle collide,...
Nov27-08 09:46 PM
34 10,872
I am reading the first chapter of Sakurai's Modern QM and from pages 30 and 32 respectively, I understand that (i)...
Aug11-06 03:21 AM
5 1,474
The SE is written in terms of a potential energy. It says, "given a particle in a region where the potential is...
Oct4-06 08:29 PM
4 1,951
How should \Delta E \Delta t \geq \hbar/2 be interpreted? When does it apply? Delta t refers to the time of what? etc....
May7-12 06:40 AM
10 8,311
In Reif's thermo book, one can read "Consider a substance which contains n magnetics atoms per unit volumes and...
Nov13-06 10:57 AM
5 5,092
In my thermo text, they consider a diatomic molecule that is rotating about the axis joining the two atoms (also the...
Nov14-06 09:42 PM
5 2,287
Hi, I have a problem with the very nature of time dependant perturbation theory (TDPT). In TDPT, we consider a...
Mar16-07 02:23 PM
3 1,493
Hi, Is there an explicit formula for the eigenfunctions of the harmonic oscillator? By explicit, I mean "not...
Mar27-07 03:30 AM
8 4,073
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
9 1,407
So, I'm pretty sure this is trivial, but I just want to be sure: My QM book frequently uses both the terms...
Oct27-08 01:25 AM
2 1,116
I have been reading about some quantum gravity topics, and am wondering: how many different modifications to the...
Nov7-08 03:09 AM
3 1,160
I was thinking about bound and unbound states the other day and want to know: Is unboundedness a requirement for a...
Jul29-09 01:45 PM
1 978
I need someone to tell me if I'm understanding things. :shy: Let's say that we're studying the infinite square well...
Aug26-09 10:11 AM
3 688
Can anyone expand on the relationship between Lie groups, Lie algebras, exponential maps and unitary operators in QM?...
Sep29-09 01:00 PM
4 1,106
I'm reviewing my undergraduate quantum mechanics from a while back, and I am not quite sure I understand this...
Jan28-10 02:51 PM
8 1,538
I am having trouble understanding how a wavefunction for three or more particles can be totally antisymmetric. Does...
Feb14-10 02:32 PM
1 685
After reading Seth Lloyd's book “Programming the Universe”(only once) I came up with a few questions. The way I...
Jul21-07 12:16 PM
1 1,094
I am wondering about acceleration in quantum mechanics. Let's consider spherically symmetric potential V(r). From the...
May19-13 08:56 PM
4 676
Consider a particle approaching a finite potential step or inside a potential well. As we know, the particle has a...
Jun14-12 10:35 AM
9 1,717
This is perhaps a stupid question, but are the field equations, for example, for QED useful for anything? By field...
Jun15-14 10:04 AM
14 1,283
Does the measurement problem ("wave function collapse") or something similar somehow manifest itself in QED and other...
May25-14 09:47 AM
44 1,350
I was thinking if you entangled both the electron and positron in a states that both of thier orbitals don't interact....
Aug10-05 06:12 PM
1 1,733
I was wondering that if neutrons stablize that atomic nuclei then it should stablize other systems. Or can other...
Nov23-11 12:29 PM
10 2,422
Is there any way to stablize these particles?
Aug11-05 01:27 AM
1 1,151

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