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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 36,425
I had a course of computational physics in university. When the professor wanted to non-dimensiolize the Schrodinger...
Jul26-14 03:36 PM
3 442
Hello Forum, The electromagnetic field EM must be treated relativistically because it travels at the speed of light...
Jul26-14 10:16 AM
3 493
Hey Everyone, Just wondering what would be a good experimental investigation involving a radioactive source and the...
Jul26-14 01:36 AM
3 536
Hi all, I'm trying to compute the effect that a magnetic field has on the singlet and triplet states of positronium. ...
Jul25-14 11:24 PM
2 403
I have never been to the pyramids in Egypt. I'd love to go one day. I am sure their configuration will be just as...
Jul25-14 09:17 PM
13 919
Forgive me if some of my question sounds misguided or misinformed - I'm new to the flux pinning game. I want to be...
Jul25-14 08:58 PM
0 386
Dirac left me in the dust at this step. Can someone please help me through it. I understand from Susskind's...
Jul25-14 08:43 PM
5 496
Hi, I'm entering graduate school this fall and was looking to improve my computational physics knowledge. I have...
Jul25-14 08:00 PM
1 382
Hey there Im preparing for an oral exam in mathematical quantum physics. not sure if this fits in here very...
Jul25-14 03:44 AM
1 430
I've got a problem which is asking for the eigenvalues and eigenstates of the Hamiltonian H_0=-B_0(a_1...
Jul25-14 12:20 AM
4 567
Just a simple question. How do we know the detector isn't messing up the double slit experiment when a single photon...
Jul24-14 10:13 PM
70 3,002
So I've been self-studying from Griffiths Intro to QM to get back in shape for graduate school this fall, and I guess...
Jul24-14 09:25 PM
1 475
On page 86 of The Principles of Quantum Mechanics, Dirac left me in his dust. I quote: ...
Jul24-14 06:03 PM
2 478
Does modern physics allow for the existence of massless fermions?
Jul24-14 12:43 PM
2 455
What exactly is all this 'matrix elements of vectors' stuff that Landau is talking about? I don't mean to ask...
Jul24-14 09:10 AM
1 421
Hello Everyone, I am currently reading about when the Quantum Mechanical Theory becomes relevant. A term that...
Jul24-14 07:29 AM
4 555
I have a few problems understanding the double slit experience and the behavior of photos due to simple observation. ...
Jul23-14 11:31 PM
15 683
I am learning identical particles recently, but I have some problem interpreting what I am writing down. So if we have...
Jul23-14 04:26 PM
Jano L.
5 816
The first postulate of quantum mechanics says that every physical system is associated with a separable complex...
Jul23-14 08:27 AM
6 844
what is the INNER QUANTUM number ?
Jul23-14 08:07 AM
6 662
Hi all! I am wondering if there is an interpretation of QM where the future is "set in stone" (for lack of a better...
Jul22-14 11:46 PM
47 3,637
How do we know/observe a particle annihilating a anti-particle? Is it impossible to theorize that in the early...
Jul22-14 02:55 PM
4 759
I thought that it would be possible to get a single photon to a double slit which would be sufficiently coherent to...
Jul22-14 10:28 AM
11 813
If: ##\hat{H} \psi (x) = E \psi (x)## where E is the eigenvalue of the *disturbed* eigenfunction ##\psi (x)## ...
Jul22-14 06:46 AM
2 745
One of the first things about QM we were taught in my undergraduate physics program is the deBroglie relation: λ =...
Jul22-14 06:24 AM
16 1,979
So we are at a distance from the black hole R>2GM/c^2 where quantum fluctuations happen all the time. How is it...
Jul22-14 05:58 AM
5 737
Since the electromagnetic and the weak force unify at high energies, why do physicist continue to count four...
Jul22-14 05:37 AM
2 697
my question is about the no-communication theorem in quantum mechanics: Assume that i have a pair of entangled...
Jul22-14 04:43 AM
4 633
Experiment: Imagine the dalayed time quantum eraser experiment, except the pair of "idler" photons(which would...
Jul21-14 04:41 PM
0 547
Hi All, I am trying too undestand the slit test which shows wave-particle duality. Please correct me if I am wrong on...
Jul21-14 03:22 PM
13 2,160
I've visited a great many sites and looked at papers to fully understand this, and still have some confusion regarding...
Jul21-14 02:57 PM
16 1,175
Hello everyone, I had a look on G.t'Hooft paper about one loop divergences and I would like to know how can I obtain...
Jul21-14 02:04 PM
0 571
If the parity operator ##\hat{P}## is hermitian, then: ##\langle \phi | \hat{P} | \psi \rangle = (\langle \psi |...
Jul21-14 09:57 AM
3 672
Consider a composite particle. Its spin is determined by the spins of its constituent particles. But the constituent...
Jul21-14 05:36 AM
Vanadium 50
9 709
To start, we have: ψ=e^{i(kx+wt)} ψ_x=ikψ ψ_{xx}=-k^2ψ λ=\frac{h}{p} k=\frac{2π}{λ} E=\frac{p^2}{2m}+V Then,...
Jul20-14 10:45 PM
12 905
There have been many posts requesting a quantum mechanical explanation for the refraction of light through glass, but...
Jul20-14 09:26 PM
4 408
At what point does matter stop having the ability to function as both a particle and a wave? In the early 1800s...
Jul19-14 09:22 PM
2 320
Hi, I was wondering whether we are sure (I know, strong word) that decoherence is the mechanism that takes us from...
Jul19-14 09:07 PM
7 691
I get a bit confused seeing where Feynman's many paths fits in to the Many-worlds interpretation. Both start off with...
Jul19-14 09:24 AM
9 859
I am curious about recent progress in relativistic Bohmian mechanics. Finding a review is proving difficult (The...
Jul19-14 08:12 AM
2 347

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