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Feb2313 08:38 AM
ZapperZ

1 
35,492 
i am having some problem in unerstanding a concept explained in my book in the chapter harmonic oscillators. as an...

Nov2710 08:29 AM
matonski

1 
873 
Hi,
Srednicki says in (38.14) that for any combination of gammas \bar{A}\equiv \beta A^{\dag}\beta. This is fine,...

Nov2710 04:05 AM
LAHLH

18 
1,683 
hi,
can we say that the Pauli exclusion principle between 2 identical fermions implies logically entanglement...

Nov2710 12:24 AM
scope

2 
584 
What is the difference between left and right Weyl spinors?
(probably they transform differently under boosts or...

Nov2610 09:46 PM
javierR

6 
1,701 
Some places say (including this paper) claim the bohr radius of muonic hydrogen is...

Nov2610 08:09 PM
Avodyne

3 
1,245 
hi,
I do wonder if the Higgs boson is a quantum object because since it is the (only) particle with spin 0, then it...

Nov2610 07:25 PM
bigubau

6 
932 
Thanks in advance for anybody who is kind enough to help me. No this isn't for my homework. I am not even enrolled in...

Nov2610 06:10 PM
fzero

1 
2,968 
I am reading Weinberg's Quantum theory of fields Vol I and have a question about the derivation on page 71.
Right...

Nov2610 03:27 PM
diraq

8 
1,746 
So if I understand Quantum entanglement just in theory, I would say that two particles (unknown as spin up or down),...

Nov2610 02:58 PM
Careful

5 
1,191 
Is the wavefunction of a particle really shaped like a wave? A lot of analogies are made about how the wave function...

Nov2610 02:41 PM
javierR

3 
879 
Hi guys,
So I'm working on this project to simulate QCD using a computer using (hybrid) monte carlo. I follow the...

Nov2610 01:35 PM
anony

0 
688 
I know the double slit experiment illustrates how an electron can be treated as a wave, but what experiment shows how...

Nov2610 11:20 AM
jtbell

3 
990 
What type of particles do representations of so(3) other than j=1/2 or j=1 correspond to?
For j=1/2 with have...

Nov2610 06:57 AM
Meir Achuz

3 
1,067 
I'm confused about the two density operators:
\rho=\sum_{i}\delta(rr_{i}) and...

Nov2610 05:02 AM
arkajad

3 
1,059 
For a continuous eigenbasis the basis vectors are not normalizable to unity length. They can be normalized only upto...

Nov2510 11:45 PM
Avodyne

1 
1,097 
Hi there,
Here is my email to Bruce Rosenblum, author of Quantum Enigma, his reply below. But I was wondering if...

Nov2510 11:19 PM
StevieTNZ

0 
803 
As I have not even taken an undergraduate course in quantum physics please overlook my ignorance. I am curious about...

Nov2510 08:34 PM
rai linga

4 
4,704 
What happens then? Weird if no inference tossles are produced, because they are produced even "with electrons instead...

Nov2510 07:59 PM
luckis11

0 
974 
hi
how to calculate the traces of product of Dirac matrices in QED.
i want caculate crossection of process...

Nov2510 04:50 PM
TriTertButoxy

1 
618 
hi, anyone can enlighten me why the pauli x matrix in the z basis is given as
0 1
1 0
while it in the x basis,...

Nov2510 04:14 PM
Fredrik

16 
3,952 
What is the probability of finding particle of KleinGordon field in some
region of space V (in an arbitrarily...

Nov2510 11:28 AM
paweld

0 
746 
Would someone tell me some website where I can find the relativistic treatment of the hydrogen atom using Dirac's...

Nov2510 11:03 AM
jtbell

2 
3,367 
Is there an easy way to prove the identities:
e^{\hat{A}}e^{\hat{B}}=e^{\hat{A}+\hat{B}}e^{/2} and
...

Nov2410 03:45 PM
Identity

2 
829 
Thought to put this here because of the waveparticle duality ties. My question, that I already asked a tutor was how...

Nov2410 03:39 PM
matonski

7 
1,458 
hi,
does anyone there know how the uncertainty position of electrons increases when the principal quantum number...

Nov2410 03:32 PM
scope

0 
1,629 
In double slit experiment, what if we put a detector on one slit, instead of both slits. Does the interference pattern...

Nov2410 12:05 PM
venton

12 
2,075 
Not sure if this is the right part of the forum.
I suppose the question is a bit out of the ordinary but I need...

Nov2410 11:37 AM
JoaoPais

10 
1,693 
The ManyWorlds interpretation tells us where the information “goes” at a measurement. Does it also tell us where the...

Nov2410 09:03 AM
nomadreid

6 
972 
Gravitational force between masses is given by the law of universal gravitation. Electrodynamics force between...

Nov2410 08:58 AM
Khrapko

5 
1,151 
According to the de Broglie hypothesis particles like electrons can have a wavelength and be treated as waves for...

Nov2410 07:52 AM
TrickyDicky

12 
1,110 
Note: I am not a physicist but i like to read about it here and there.
But my idea is this (probably thought of...

Nov2410 07:28 AM
haael

1 
1,351 
I've come accross this a few times:
<S_x^2> = <S_y^2>=<S_z^2>=\hbar^2/4
But I can't seem to understand why this...

Nov2410 03:52 AM
arkajad

1 
573 
So we all know about a and a^\dagger.
My problem says that if f(a^\dagger) is an arbitrary polynomial in a^\dagger...

Nov2410 02:21 AM
arkajad

18 
1,399 
Hi
I have a problem. I'm an undergraduate student and I will have to do
my thesis next term. My professor proposed...

Nov2310 09:01 PM
Ivania

0 
2,571 
I have thought of this theory for sometime and wished to tell others for some feedback. I believe that there is more...

Nov2310 06:36 PM
berkeman

4 
998 
Hey guys!
I didn't know where else to turn to but this forum.
I am trying to figure out what the difference...

Nov2310 02:01 PM
mariush

8 
12,547 
free energy is often defined in canonical ensemble
but can we define it for microcanonical ensemble?
why...

Nov2310 12:02 PM
wdlang

0 
1,359 
For the similar page in the 2nd edition, turn page 37 at this link.
He states that K = +/ i/2 sigma.
How is...

Nov2310 05:59 AM
Demystifier

4 
1,045 
Hello there,
I've got two short questions I was hoping you could help me with:
I have to prove:
"if f is...

Nov2210 10:24 PM
norousan

2 
889 
Hi everyone,
I have the following question about coherent states: It is known that the creation operator has no...

Nov2210 08:46 PM
Shadowz

11 
4,588 