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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 36,439
I was just wondering that thought we ( I mean scientists :tongue2: ) are working to try to find a way out of...
Jun5-09 08:41 AM
2 1,613
I'm taking up QFT for the first time. Basic question really. Given the free complex Klein-Gordon field \phi under the...
Sep8-06 07:35 AM
7 1,316
Hello, i want to know if there is any way we can describe the way our brain transfers information using Quantum...
Nov3-11 08:40 AM
10 2,306
i have read and studyed that 1/ boson are identical particles having zero or integral spin and can not be...
Apr16-08 11:30 AM
3 10,356
can you tell me " is there any physical significance of the phase velocity? like we know that the group velocity is...
Jun20-08 12:31 PM
0 1,137
Is the charge density ρ(r) of a molecule concave or convex at points (r) in the molecule's space?
Apr4-13 10:47 AM
0 319
hi this is abhimanyu. i m a new comer in the world of quantum physics. pls tell me what is wave packet?
Dec31-08 01:44 PM
3 3,189
What is the definition of energy for quantum systems with time dependent Hamiltonians? Is it the eigenvalue of the...
Jan28-12 12:39 PM
4 1,805
what is the difference between strong force and residual strong force ?what is its range?
Jun23-13 12:02 PM
1 661
In general I could understand the meaning of spin.But in quantum level it is getting more complicated that I couldn't...
Jul20-13 01:46 PM
2 493
Does all types of quantum particles exist all time? If so where are charm and strange, top and bottom quarks located...
Nov8-13 06:14 AM
1 456
So if light acts like waves when interacting with huge objects and acts like regular particles when interacting with...
Apr8-12 01:51 PM
2 837
Hi guys, is there a reason why the energy of the harmonic oscillator is always written as:$$ E_{n} = \hbar \omega...
Apr19-13 02:38 PM
1 488
Hi guys, I consider fermionic holes and I know the creation and annihilation operators of them. I have shown that...
Jan3-14 12:50 PM
2 412
Hey, I consider a diagonalized Hamiltonian: H=\sum\limits_{k} \underbrace{ (\epsilon_{k} u_{k}^2 -\epsilon_{k}...
Jan8-14 09:20 AM
1 496
Hello, I regard field-operators, whereby \Psi is a fermionic-annihilation-operator and \vec{A(\vec{r})} is an...
Jan17-14 05:47 PM
2 362
Hello, I am thinking for some hours about the commutation of the field-Operator/(annihilation-Operator): \Psi and...
Jan18-14 11:30 PM
3 501
Hey, in my notes I have calculated the Eigenenergie of the Hamiltonian: H= \hbar \omega (n+\frac{1}{2}) \cdot ...
Jan28-14 04:13 PM
4 427
In my note, we have written the field strength tensor as: F^{\mu\nu} =\partial ^\mu A^\nu -\partial ^\nu A^\mu...
Jan28-14 07:10 PM
5 389
Hi I regard, $$=0$$ but \Psi is a field-operator. I don't understand why the commutation of the derrivative of...
Feb1-14 06:00 PM
3 385
Hey Guys, I regard two operators \Psi , \Phi , that don't commute. Does the product-rule, looks like that? ...
Feb6-14 05:34 AM
2 292
Hey guys, I regard a relativistic vector: $$ k^\mu =(k^0,k^1,k^2,k^3,)=(\frac{\omega_k}{c}, \vec{k} ) $$ ...
Feb8-14 02:24 PM
Meir Achuz
2 323
Hi all. Here is an n-particle hamltonian. H=\int...
Jun25-11 10:30 PM
9 1,082
Hi everyone, I have a question concerning the double slit experiment that I would like clarified. According to a...
Sep28-09 08:05 PM
1 621
Hi Iam having a little problem understaning why some atoms are configured in a certain way. I know that each...
Apr3-10 10:03 PM
3 1,059
Hi, There is this one thing that bugs me about photoelectric effect, everywhere I read it says usually the K-shell...
Aug31-13 12:03 PM
10 1,357
Hi, Iam having trouble understanding (or actually picturing) things I have learned, now that I look back at it. ...
Aug29-13 03:22 PM
4 591
Suppose, i want to diagonalize operator A by matrix S (A'= S^\\dagger A S). Do i need to form S from "NORMALIZED"...
Sep20-10 10:50 PM
1 806
Hi, I'm doing research to chipproduction, and I can't seem to figure out how transistors really work (in detail)....
May4-05 11:08 AM
6 2,989
This question appeared in my exam . Q. A bullet of mass 41g travels at 960m/s. what wavelength can we associate...
Mar20-11 03:06 AM
2 1,295
Hey guys! First time posting on this site. Been reading for quite a while and really loving it! :thumbs:! I'm a...
Feb12-14 01:09 AM
3 434
Hi guys. I'm trying to get the idea of probability density for 1s hydrogen atom. I just don't understand that...
Feb22-14 10:51 AM
3 429
Hey guys. I'm struggling to picture ultraviolet catastrophe. The graph tells me that at certain temperature, intensity...
Apr11-14 05:46 PM
3 516
Hi, I am scratching the surface of information regarding particle physics. I have a basic understanding of standard...
Aug9-12 03:01 PM
19 4,469
I've been looking into the time independent schrodinger equation (E\Psi = Ĥ\Psi.) I know that \Psi is the wave...
Jul9-12 07:10 PM
1 794
Hi, ΔEΔt ≥\frac{h}{4\pi} How does this formula relate to particle creation? I understand that it is relevant to...
Feb1-13 11:58 AM
2 447
Is Gravity a Force of Attraction? We are familiar with electromagnetic attraction and we understand how and why it...
Dec18-04 05:18 PM
1 4,106
Hello How can a monochromatic light induce a transition ( absorption ) between two energy levels whose energy...
Jun26-06 08:11 AM
3 1,779
Hello I was thinkng of this question and I found it best expressed in a clear manner in another site. I quote the...
Oct15-06 10:40 AM
37 5,333
I have several questions in quantum optics or the quantum theory of radiaition. I begin by the following three...
Nov3-06 03:58 PM
4 2,765

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