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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 36,183
I was watching Richard Feynman's lectures on quantum electrodynamics where he concerned the probability of photon to...
Jun3-14 07:33 PM
1 252
This oft-referenced picture depicts a simulation of virtual particles popping into and out of existence in the empty...
Jun3-14 12:07 AM
2 320
It is available for free from this source. If someone can explain what has really been done here in simple English,...
Jun2-14 10:57 PM
2 268
If spherical harmonics are simultaneous eigenfunctions of \hat{L} and \hat{L}_{z}, then that means for a state at...
Jun2-14 03:53 PM
2 228
I learnt about the E<V(bound) and E>V cases. But what if V=E? Can we at all conclude V=E due to uncertainty...
Jun2-14 02:17 PM
0 233
Hey, i hear about quantum teleportation on the news today. They said that they successfully teleported information....
Jun2-14 12:43 PM
19 776
A friend is a quantum chemist. He is in agreement that climate change is bad (he feels the primary problems with CO2...
Jun2-14 06:27 AM
1 288
I have some questions regarding the Heisenberg picture of QM. 1. How does one calculate probabilities for measuring...
Jun2-14 12:13 AM
1 355
I am going through James Binney's course on Quantum Mechanics. I love all of the little misconceptions he points out...
Jun1-14 06:30 PM
13 379
Hello look at (3.24). Above it, it states "We make the same switch to polar coordinates (x, φ) in the (x, y) plane,...
Jun1-14 06:14 PM
2 232
Do individual photons have some attributes which relate to EM wave frequency? In other words, is there any difference...
Jun1-14 12:28 PM
7 384
Quantum Mechanics using Index notation. Is it possible to do it? I really don't get the Dirac Notation, and...
Jun1-14 09:00 AM
105 2,726
Is it true that there always exist a unitary matrix that can take a state vector of an arbitrary pure state to another...
Jun1-14 03:19 AM
7 541
The eigenstates of a hydrogen atom are stationary states with definite values of energy. Now, as I understand it, the...
May31-14 05:33 PM
4 292
A new type of energy storage described which uses quantum way to store energy. ''Battenice''. ...
May31-14 09:08 AM
1 514
I am able calculate the solution for the TISE relating to the interval to the right of a step potential; however, I am...
May31-14 02:52 AM
Simon Bridge
27 1,092
Is Timespace a literal real thing? or is it an abstract idea? and what makes physisists so sure that gravity is a...
May30-14 07:44 PM
3 432
I am looking around for some sort of equation regarding optical power dissipation of light (ultraviolet light in...
May30-14 12:53 PM
Jano L.
1 257
Hello, I need help understanding how to apply the formula for converting a Lagrangian to an equation of motion in...
May30-14 09:14 AM
8 284
Hi everybody, Is it possible to obtain an expression equivalent to fermi golden rule within the framework of Green...
May30-14 08:08 AM
0 230
I was watching a YouTube video about heisenberg's uncertainty principle and was wondering if it only works for...
May30-14 01:45 AM
11 360
I'm looking for the source for the QM interpretation of "shut up and calculate". I thought it was synonymous with the...
May30-14 12:34 AM
13 593
What happens to ψ in a infinite potential well when the width is suddenly reduced to half its previous value ? Will...
May29-14 10:01 PM
2 383
Am I correct in my understanding that the standard model predicts that there should be more matter than antimatter in...
May29-14 10:01 PM
5 383
The smallest amount of energy possible is called quantum of energy and is = hf. But are frequencies also quantized?...
May29-14 09:08 PM
19 910
As far as I know Feynman was the first who told that if you would put detectors at the double slits the interference...
May29-14 03:40 PM
7 369
Do unobserved particles exchange information with other particles? If not then they are not only unobserved but also...
May29-14 01:11 PM
7 329
Pardon my wording as I do not have a solid background in physics, while pondering The effects of observation on a...
May29-14 03:17 AM
9 338
I have been struggling with one simple question. How can one measure the momentum of a particle within a field without...
May28-14 09:16 PM
3 239
In pseudo-thermal ghost imaging using a laser beam passing through a rotating ground glass plate, the temporal...
May28-14 02:50 PM
20 354
Hi, Im not sure if my way of tackling a question, probably it's a trivial problem, but it's important for me to get...
May28-14 12:12 AM
3 395
About the fact that electrons have a determined position only after having been observed/measured, I don't understand...
May28-14 12:03 AM
5 490
So I was reading this, a list of common misconceptions...
May27-14 11:38 AM
5 403
Pardon me for my ignorance. This is a question of curiosity. I look for a concise logical argument as to why the...
May27-14 11:02 AM
10 460
I know about symmetry and antisymmetry and so on, but a thought that I had never considered just hit me. If we had two...
May27-14 01:28 AM
3 296
Hey everyone. I have a couple of question regarding wave function collapse. I can accept that one cannot make...
May26-14 10:38 PM
6 327
I'm in the first of 3 courses in quantum mechanics, and we just started chapter 4 of Griffiths. He goes into great...
May26-14 10:15 PM
5 367
Hi. I am reading a book entitled "Atom-Photon interactions" by Claude Cohen-Tannoudji, et al. There is a symbol...
May26-14 08:50 PM
1 189
"Locally, the spin density S is an intrinsic (i.e. origin-independent) quantity, which is associated with the local...
May26-14 06:38 PM
2 283
Am I right to think that particles cooled asymptotically to 0 K would have wave functions the size of galaxies or even...
May26-14 04:59 PM
11 461

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