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If you are seeking help with a...

Feb2313 08:38 AM
ZapperZ

1 
35,469 
there is a way to write the expansion (in terms of self energy and bare propagator) of the dressed propagator without...

Nov2112 11:34 AM
paolorossi

0 
454 
I sometimes see these words used to describe puzzling aspects of quantum mechanics. Can someone explain exactly what...

Aug1012 08:06 AM
Naty1

7 
1,005 
I'd like to find out more about A. Neumaier's interpretation of quantum mechanics.
How?

Aug1512 08:46 AM
ImaLooser

3 
667 
Griffiths's QM textbook says on page 236 regarding the fine structure constant calculation from first principles:
...

Mar709 12:51 PM
confinement

1 
719 
I read some paragraphs from Michio Kaku's Hyperspace about Abdus Salam's illustration of symmetry breaking using a...

Jul704 05:58 PM
Tyger

2 
1,378 
Hello everyone,
I am trying to solve timedependent LiouvillevonNeumann equations for the dynamics of an electron...

Jun2312 09:20 PM
Einstein Mcfly

4 
959 
according to uncertainity relation product of dE*dt >=h/2*pi this defines the time limit to which energy conservation...

Oct1810 03:28 PM
khs1

0 
778 
in the schrodinger equation the integration constant in the angular wave
equation is set to L(L+1).
may i know why...

Mar2411 01:07 PM
clem

3 
834 
We have seen this famous relation between particle's momentum and its wave length as
p=h/λ
Can we interpret its...

Sep2011 09:30 AM
Naty1

1 
660 
Hi everyone,
I am doing some calculations related to elastic Pion  nuclei scattering in the Eikonal model and have a...

Nov1513 08:51 AM
k54ledung

0 
516 
Hi there, you know there are simple mathematical calculations, rather based on arithmetic properties (module,...

Aug2509 10:27 AM
snnmbr

2 
1,746 
is the idea that collapse cannot be defined as something that occurs, generally known and accepted?
thx

Mar1306 11:05 AM
alfredblase

12 
1,161 
Since my discussion with Juan R in the thread "photon's mass is zero?" under Special and General relativity went off...

Sep1605 04:19 PM
hellfire

29 
5,725 
Hi there,
In 3dimensional real linear space, the simplest bases can be taken as the canonical bases
\hat{x} =...

Feb1709 10:25 AM
msumm21

4 
1,486 
how does light slow down considerably when it passes through one? i have always been told that lights speed remains...

Sep204 02:05 AM
Chronos

4 
1,952 
I saw one online material about the boson statistics, it said for boson, it needs the chemical potential to be...

Dec312 09:32 PM
KFC

0 
562 
can we use QM for predict how chemical reaction will end up
or who much energy we must give for a reaction to...

Aug2409 04:34 PM
hagopbul

0 
771 
Does the Compton scattering equation
\lambda '  \lambda = \frac{h}{m_{e} c} (1cos \theta )
work even...

Dec2708 02:26 PM
lightarrow

8 
1,921 
I want to know that ,I have read in many books regarding compton's effect that a photon collides with an electron and...

Jun2014 05:02 AM
Esfand Yar Ali

7 
295 
Suppose that one electron from the end of the universe is emitted to the quantum rectangular barrier potential whose...

Jul511 01:41 AM
Younghun park

5 
1,242 
In Wikipedia this sentence is written about degeneracy;
In physics, two or more different quantum states are said to...

Jul1112 01:15 PM
Amok

3 
500 
Assume there is a two level system, two eigenstates are written as
\psi_1\rangle = \cos\theta 1, g\rangle +...

May909 01:05 PM
deferro

17 
1,524 
In twolevel system, with external field applied, why there is no permant dipole moment? In classical point of view,...

Jun509 07:31 PM
clem

3 
979 
can anyone plzzzzz tell me wether we can write dirac equation in the form of some uncertainty relations,?????????? if...

Apr2709 11:46 AM
g.bashyam

0 
698 
While studying the Dirac Equation, we come across the gamma matrices. Can we consider these matrices as the...

Feb1513 05:09 AM
Bill_K

2 
556 
For a system consists of two particle, says two spins, the wavefunction for that system is a direct product of each...

Oct3008 10:41 PM
KFC

9 
1,765 
I learnt fundamental statistical physics some times ago. But so far I still don't understand how distinguishabilty and...

Feb109 10:37 PM
vanesch

1 
2,454 
As we know that each electron wave function in a periodic potential can be represented in k space by a sum of infinite...

Oct1510 10:30 PM
ntusg

0 
1,703 
Hi every body and how do you do
first sorry of my weak language cuz I'm new physical Researcher at KACST & I'm...

Nov2010 02:41 AM
ArjenDijksman

2 
1,009 
I have some question about Ensemble Average.
The macroscopic variable of some matter is average of microscopic...

May1212 02:37 AM
Nohhoon Lee

0 
614 
On page 237, Weinberg checked eq. (5.7.23) with an example when \mathbf p is along the three direction. Below that...

Jul3112 10:31 PM
diraq

0 
490 
Suppose in one dimension we have a particle in box with the lenght a. If we were to expand it's ground state wave...

Jan1012 03:30 PM
Simon Bridge

1 
653 
I found it is difficult to enumerate all the diagrams and errors easily come out. I like the algebraic approach,...

May2410 03:36 PM
diraq

0 
948 
Hi everybody, I'm new.
I'm approaching to QFT in these months and I have a couple of questions about Feynman rules....

Jul2309 02:06 PM
RedX

2 
1,210 
Hi,
I've just read Feynman's book:'QED:The strange theory of light and matter' and, in order to measure the...

Aug2109 04:30 AM
penguin007

9 
2,016 
HI,
I wanted to know what is field anyway, Is it wave, particle or some different sort of physical entity.

Oct909 12:57 AM
skippy1729

7 
719 
First of all, let me remind about an older thread on this topic:
http://www.physicsforums.com/showthread.php?t=330517...

Apr1511 06:47 PM
izh21251

7 
1,706 
If I know the explicit form of potential, the energy and a specific eigenstate, but I don't know the general form of...

Dec3008 11:45 PM
msumm21

5 
1,459 
i am spliting H2O in my lab by only 6 volt and 2 Amp
but how much volts you need to split H2O to H2 and O ,...why...

Nov2511 10:35 AM
hagopbul

0 
857 
why i\hbar(\partial/\partialt+i\Omega)=i\hbarexp(i\Omegat)\partial/\partialtexp(i\Omegat)

Sep107 08:43 PM
K.J.Healey

2 
1,275 