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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 30,461
I'm away from my university studying in a far away land, and I dram up questions, but I have no one to ask... Where...
Dec2-05 08:08 PM
rand310
0 851
Does anyone know the limits on a true two slit experiment? I see where the use of “Grates” with larger particles...
Mar5-05 07:23 AM
RandallB
25 4,446
Puzzling paradoxes that classical explanations fail to resolve, but are resolved by QM include: 1 Electrons don’t...
Mar20-05 06:06 PM
RandallB
23 2,727
Anyone else see the Penrose article in DISCOVER? "Two places at once" Not sure what he’s thinking with the...
May19-05 07:42 PM
selfAdjoint
3 1,298
LnGrrR Since the old thread is well off topic from the OP I’ll continue comments on Entanglement in a new thread ...
Apr3-06 09:01 AM
LnGrrrR
27 2,876
Flaw in Anton Zeilinger article (Rev. Mod. Phys., Vol. 71, No. 2, Centenary 1999) This Thread is a continuation...
Nov26-06 05:28 AM
vanesch
7 3,850
Does anyone know of a reference that describes the effect of adding a quarter wave plate or even a half wave plate...
Jan8-07 12:55 PM
RandallB
0 1,194
Einstein and a few others since the 1935 EPR paper took the position that defining in knowable terms a hidden variable...
Sep15-07 02:18 AM
yuiop
39 6,288
Is BM “Bohmian Local” actually Local The debate over “local” as defined by Bohmian Mechanics compared to the...
Sep5-07 04:33 PM
RandallB
17 3,161
Continuing the Dopfer discussion from other thread: Well of course there would be a pattern when you change...
Aug27-08 07:21 PM
Cthugha
29 2,494
At low velocity the group velocity is double the phase velocity (velocity of de Broglie waves). But phase velocity is...
Aug7-08 12:24 AM
cesiumfrog
1 1,065
During a lecture about QFT...
Jul22-08 02:56 AM
Zacku
1 1,654
Are there experiments which you can claim that they are the evidence of the time-energy uncertainty relation? Or can...
Jan18-10 03:23 PM
Bob S
2 1,214
Like the title says, why are the only possible values of an operator its eigenvalues? reading shankar right now and...
Nov4-12 01:33 AM
atyy
2 531
So, when dealing with the Hydrogen molecule (H2) we know each electron is antisymmetric since they're fermions i.e....
Nov15-12 07:35 AM
andrien
1 698
When dealing with n-particle systems that are identical, is the superposition of them just a mathematical construct,...
Nov23-12 08:06 AM
mfb
5 850
I'm looking through Nielson's book on quantum computation and information and in part of it he says that any $C^2(U)$...
Feb26-13 05:23 AM
McLaren Rulez
1 451
I'm an undergraduate physics student and whilst Quantum Physics is a fascinating area, it has me constantly asking...
Jan5-10 09:32 PM
SimonA
3 744
I can understand that if z= a + ib then z*=a - ib, where the definition of the complex conjugate is reversing the sign...
Apr6-10 05:05 PM
Cyosis
2 2,563
I'm studying for my Quantum Mechanics course and I've understood most of it so far, until we reached the quantum...
Apr24-10 02:20 PM
SpectraCat
1 3,129
Just started revision for Quantum Mechanics after a very long break so everything is a bit rusty. Don't have anyone...
Feb8-11 08:16 PM
randybryan
3 863
The TISE can be written as -\frac{\hbar^{2}}{2m}\frac{d^{2}u}{dx^{2}} + \frac{1}{2}m\omega_{0}^{2}x^{2}u = Eu ...
Feb20-11 01:00 PM
RedX
4 1,265
To find the probability of a particle being at position x we use <\Psi|\Psi> where the complex conjugate ensures...
Mar12-11 06:33 AM
randybryan
2 1,329
If I have an atom with energy levels of -4 ev, -2 ev -1 ev and 0 ev and I radiate it with photons which cover a...
Apr2-14 12:42 PM
ranger275
2 181
Why is a photon considered to be its own antiparticle? What distinguishes a photon from an antiphoton? When photon and...
Feb3-10 02:20 AM
DrDu
25 9,617
Do positively charged holes have any other quantum numbers assigned to them? What are the similarities and differences...
Feb3-10 02:59 PM
DrDu
29 2,919
Heavy particles produced in high energy collisions in accelerators are 'hidden' in normal low energy conditions. Might...
Mar28-10 02:58 PM
Ranku
3 836
In QM, particles are treated as either waves or particles, a duality exists. A test particle in freefall is used in...
Jun22-04 05:14 AM
modmans2ndcoming
4 1,344
Here is a proposal that comes right out of Star Trek! http://uk.arxiv.org/PS_cache/quant-ph/pdf/0401/0401186.pdf ...
Feb2-04 11:54 AM
ranyart
0 1,525
This paper is really thought provoking in its reasoning behind the HUP and how it imposes upon Maths and Physics. ...
Feb27-04 08:33 AM
ZapperZ
3 2,997
Is there such a thing as a Law Of Observation? How would one define this Law? If yes please state if this has its...
Mar11-04 12:09 PM
jackle
15 4,540
Can Dirac equation be used for many particles (fermions) system (i.e. a nucleus with many electrons)? And in this case...
Feb17-10 05:09 PM
clem
8 3,083
Problem: ----------- I’m trying to understand how to generally find Eigen functions/values (either analytically or...
Jun4-11 10:38 PM
ranytawfik
3 1,326
Suppose you have a container with perfectly reflecting walls, containing electromagnetic radiation that is not in...
Feb13-12 04:27 PM
Rap
12 2,249
Looking at the Sackur-Tetrode equation for the entropy of a mono-atomic ideal gas: S=kN\left S is entropy, V is...
Mar7-12 01:26 PM
Rap
18 2,866
Hello Friends, About Dirac's postulation about non conmutative operators and the scalar function with 4 elements,...
Feb16-05 05:19 AM
Raparicio
4 1,197
Dear Friends, Just adjoint a link to a page (finally and pourly translated to english) about the Schrödinger...
May14-05 03:34 AM
Raparicio
1 911
I have been trying to understand the field theory from the basics and have come across a few things I have not...
Mar7-11 11:32 AM
rapids79
0 1,190
I found this in Srednicki's QFTbook. I don't know what ↔ means. Help me, please
Jun12-13 12:45 PM
Bill_K
3 360
Is there a way to know qualitative information about energy spacing of bound state energy? Infinite square well....
Oct6-13 11:38 PM
Simon Bridge
7 651

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