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Feb2313 08:38 AM
ZapperZ

1 
36,439 
I was just wondering that thought we ( I mean scientists :tongue2: ) are working to try to find a way out of...

Jun509 08:41 AM
Naty1

2 
1,613 
I'm taking up QFT for the first time. Basic question really. Given the free complex KleinGordon field \phi under the...

Sep806 07:35 AM
selfAdjoint

7 
1,316 
Hello, i want to know if there is any way we can describe the way our brain transfers information using Quantum...

Nov311 08:40 AM
abbeynewton

10 
2,306 
i have read and studyed that
1/ boson are identical particles having zero or integral spin and can not be...

Apr1608 11:30 AM
lbrits

3 
10,356 
can you tell me " is there any physical significance of the phase velocity?
like we know that the group velocity is...

Jun2008 12:31 PM
abdullahbameh

0 
1,137 
Is the charge density ρ(r) of a molecule concave or convex at points (r) in the molecule's space?

Apr413 10:47 AM
AbdulQat

0 
319 
hi this is abhimanyu.
i m a new comer in the world of quantum physics. pls tell me what is wave packet?

Dec3108 01:44 PM
tim_lou

3 
3,189 
What is the definition of energy for quantum systems with time dependent Hamiltonians? Is it the eigenvalue of the...

Jan2812 12:39 PM
xepma

4 
1,805 
what is the difference between strong force and residual strong force ?what is its range?

Jun2313 12:02 PM
mfb

1 
661 
In general I could understand the meaning of spin.But in quantum level it is getting more complicated that I couldn't...

Jul2013 01:46 PM
Couchyam

2 
493 
Does all types of quantum particles exist all time? If so where are charm and strange, top and bottom quarks located...

Nov813 06:14 AM
Demystifier

1 
456 
So if light acts like waves when interacting with huge objects and acts like regular particles when interacting with...

Apr812 01:51 PM
vanhees71

2 
837 
Hi guys,
is there a reason why the energy of the harmonic oscillator is always written as:$$
E_{n} = \hbar \omega...

Apr1913 02:38 PM
dextercioby

1 
488 
Hi guys,
I consider fermionic holes and I know the creation and annihilation operators of them.
I have shown that...

Jan314 12:50 PM
Abigale

2 
412 
Hey,
I consider a diagonalized Hamiltonian:
H=\sum\limits_{k} \underbrace{ (\epsilon_{k} u_{k}^2 \epsilon_{k}...

Jan814 09:20 AM
DrDu

1 
496 
Hello,
I regard fieldoperators, whereby \Psi is a fermionicannihilationoperator and
\vec{A(\vec{r})} is an...

Jan1714 05:47 PM
Avodyne

2 
362 
Hello,
I am thinking for some hours about the commutation of the fieldOperator/(annihilationOperator): \Psi and...

Jan1814 11:30 PM
Avodyne

3 
501 
Hey,
in my notes I have calculated the Eigenenergie of the Hamiltonian:
H= \hbar \omega (n+\frac{1}{2}) \cdot
...

Jan2814 04:13 PM
Cthugha

4 
427 
In my note,
we have written the field strength tensor as:
F^{\mu\nu} =\partial ^\mu A^\nu \partial ^\nu A^\mu...

Jan2814 07:10 PM
ChrisVer

5 
389 
Hi I regard,
$$=0$$
but \Psi is a fieldoperator.
I don't understand why the commutation of the derrivative of...

Feb114 06:00 PM
WannabeNewton

3 
385 
Hey Guys,
I regard two operators \Psi , \Phi , that don't commute.
Does the productrule, looks like that?
...

Feb614 05:34 AM
Bill_K

2 
292 
Hey guys,
I regard a relativistic vector:
$$
k^\mu =(k^0,k^1,k^2,k^3,)=(\frac{\omega_k}{c}, \vec{k} )
$$
...

Feb814 02:24 PM
Meir Achuz

2 
323 
Hi all. Here is an nparticle hamltonian.
H=\int...

Jun2511 10:30 PM
strangerep

9 
1,082 
Hi everyone,
I have a question concerning the double slit experiment that I would like clarified. According to a...

Sep2809 08:05 PM
abomination5

1 
621 
Hi
Iam having a little problem understaning why some atoms are configured in a certain way.
I know that each...

Apr310 10:03 PM
abotiz

3 
1,059 
Hi,
There is this one thing that bugs me about photoelectric effect, everywhere I read it says usually the Kshell...

Aug3113 12:03 PM
abotiz

10 
1,357 
Hi,
Iam having trouble understanding (or actually picturing) things I have learned, now that I look back at it.
...

Aug2913 03:22 PM
Nugatory

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"...

Sep2010 10:50 PM
Parlyne

1 
806 
Hi,
I'm doing research to chipproduction, and I can't seem to figure out how transistors really work (in detail)....

May405 11:08 AM
abraxas

6 
2,989 
This question appeared in my exam .
Q. A bullet of mass 41g travels at 960m/s. what wavelength can we associate...

Mar2011 03:06 AM
abrowaqas

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...

Feb1214 01:09 AM
Khashishi

3 
434 
Hi guys. I'm trying to get the idea of probability density for 1s hydrogen atom.
I just don't understand that...

Feb2214 10:51 AM
jtbell

3 
429 
Hey guys. I'm struggling to picture ultraviolet catastrophe. The graph tells me that at certain temperature, intensity...

Apr1114 05:46 PM
The_Duck

3 
516 
Hi,
I am scratching the surface of information regarding particle physics. I have a basic understanding of standard...

Aug912 03:01 PM
JeremyEbert

19 
4,469 
I've been looking into the time independent schrodinger equation (E\Psi = Ĥ\Psi.)
I know that \Psi is the wave...

Jul912 07:10 PM
nonequilibrium

1 
794 
Hi,
ΔEΔt ≥\frac{h}{4\pi}
How does this formula relate to particle creation? I understand that it is relevant to...

Feb113 11:58 AM
The_Duck

2 
447 
Is Gravity a Force of Attraction?
We are familiar with electromagnetic attraction and we understand how and why it...

Dec1804 05:18 PM
selfAdjoint

1 
4,106 
Hello
How can a monochromatic light induce a transition ( absorption ) between two energy levels whose energy...

Jun2606 08:11 AM
inha

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...

Oct1506 10:40 AM
actionintegral

37 
5,333 
I have several questions in quantum optics or the quantum theory of radiaition. I begin by the following three...

Nov306 03:58 PM
actionintegral

4 
2,765 