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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 30,407
I would like to know if the electric charge of a particle, like electron, has always a definite value, or on the...
May15-10 10:22 AM
chrisphd
10 2,702
what is the JOst function and how and why it appears in Scattering problems ?, for example given the Hamiltonian ...
May15-10 09:02 AM
zetafunction
0 2,409
Could someone please help me get a very basic intuitive understanding of what rotational and vibrational quantum...
May15-10 02:24 AM
ansgar
1 858
Do the so called "Bell States" form a basis for any arbitrary two particle state, including non-entangled states?
May15-10 12:08 AM
chrisphd
0 669
Hey, the coupling constant in QFT is scale dependent. This scale \mu, it seems to me, is a mathematical tool used...
May14-10 03:36 PM
humanino
2 872
Hahaha, yeah I did a search on these forums for questions regarding Virtual Particles and it seems its "the horse...
May14-10 12:56 PM
humanino
2 850
I might make a cloud chamber, which requires for a very small amount of lead 210 on a needle tip, and i have found a...
May14-10 09:11 AM
sweet springs
1 1,616
I was doing an undergrad experiment on the sodium emission spectrum and I have a few queries. Of course, I was asked...
May14-10 05:50 AM
Vanadium 50
31 17,246
I want to know how to normalize symmetric and anti-symmetric wave functions ???????????
May14-10 02:53 AM
ansgar
1 918
We have the uncertainty principle. How would our world be different, if someone measured position and momentum of a...
May13-10 12:55 PM
SpectraCat
3 1,368
Yes, I know the thread name sounds like something you might see on the cover of Discover (or sadly, Scientific...
May13-10 09:55 AM
Lord Crc
144 11,198
It is sometimes said that wave functions are not real, and simply represent the observer's knowledge of the system. I...
May13-10 08:57 AM
DevilsAvocado
78 6,715
The wave function of "particle in a box" is Asin(kx). Since potential energy is zero inside the box, so the...
May12-10 06:38 PM
sweet springs
12 7,168
I've heard the two-slit experiment described over and over, but there's still something about it that seems unclear to...
May12-10 06:36 PM
DevilsAvocado
35 5,178
I don't usually consider "waves" to have mass. They're just energy that moves THROUGH mass. Light waves, sound waves,...
May12-10 03:45 PM
LostConjugate
32 2,555
I need a calculation section of the article without Compton scattering method does not use quantum field theory. Can...
May12-10 12:22 PM
humanino
1 771
If I fire photons at a glass, some will be reflected back and some will go through. Which ones is by deifnition...
May12-10 12:21 PM
DrChinese
3 842
Hi, I'm a novice at quantum and I was just wondering why an electrically neutral fluorine atom needs to...
May12-10 11:22 AM
SpectraCat
8 2,102
It puzzles me. In Einstein's paper on the photoelectric effect he proposed that photons with E = nhf were the...
May12-10 10:58 AM
LostConjugate
0 764
Hi, I was wondering if anyone could explain how Srednicki gets to his eqn 26.7: \tilde{dk_1}\tilde{dk_2} \sim...
May12-10 03:10 AM
haushofer
5 806
This might seem like a foolish query, but I'm having a hard time understanding the rules of degenerate states. I know...
May12-10 12:48 AM
diazona
2 835
Does the momentum space of a particle in an infinite square well have spikes or is it continuous? I've heard so...
May11-10 09:44 PM
sweet springs
7 1,925
Is there agreement here or are all/most of the neutrons in the same state?
May11-10 03:01 PM
Frame Dragger
13 1,456
Hi, Source: http://arxiv.org/abs/0808.3316 I haven't studied more than the basics in QM. Therefore I don't...
May11-10 02:36 PM
billbray
3 1,933
I'm losing my mind trying to differentiate spin, isospin, weak isospin; then there's chirality, helicity - i must be...
May11-10 02:29 PM
haael
2 3,168
When talking about classical probabilities, like whether the ball is in one of two boxes, with 1/2 probability for the...
May11-10 12:13 PM
haael
7 1,027
I read two articles recently and I am wondering if I have the correct interpretation of them. They deal with joint...
May11-10 07:09 AM
Demystifier
17 4,741
I wonder how Dirac equation transform under change of coordinates (in flat spacetime). Should I simply express...
May11-10 06:04 AM
schieghoven
1 870
Hello! I wonder is there exist a way to deduct the conserved current equation, generator of the...
May11-10 02:35 AM
Dyson
2 819
This question relates to Griffiths: Introduction to Elementary Particles, p. 196 The process in question is a...
May10-10 05:39 PM
clem
1 2,861
The current Young optical experiment induces interference between 2 waves when the two intermediary holes are opened...
May10-10 04:22 PM
DrChinese
4 1,458
thinking about ray tracing from another thread and musing a bit on it I wondered something. In all cases that I've...
May10-10 04:09 PM
madhatter106
0 805
I read in a book: For a qubit defined as: \frac{1}{\sqrt{2}}(|0\rangle + |1\rangle) Since |0\rangle and...
May10-10 03:53 PM
kanato
4 882
An alpha-particle produced by radioactive decay leaves a visible continuous track in a Wilson Cloud Chamber. As it...
May10-10 03:25 PM
humanino
1 907
Looking at the KG propagator given in: http://en.wikipedia.org/wiki/Propagator#Scalar_propagator, I can't seem to...
May10-10 03:18 PM
Heirot
0 1,094
I've had some trouble with the argument "spin angular mometum has no classical analogue", that everyone seems to be...
May10-10 12:04 PM
chwie
17 4,781
Hi, I am currently working through Griffith's textbook on quantum mechanics. I was just wondering if there are...
May10-10 11:49 AM
Fredrik
2 883
I don't have any problems dealing with mechanical calculations(I think), but yet I have some conceptual problems with...
May10-10 12:14 AM
ahmad2l
6 10,681
So, rookie question, I know, but I'm having a little trouble with the idea of wavefunction collapse as it pertains to...
May9-10 08:49 PM
wduff
2 1,760
Hi PhysicsForums, I'm writing a term paper on the properties of the von Neumann Entropy, its relation to the...
May9-10 06:29 PM
LukeD
2 1,006

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