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Feb2313 08:38 AM
ZapperZ

1 
36,364 
hi there. I studied physics for years, even went as far as getting a PhD. but that was 13 years ago, since then...

Aug913 12:07 AM
tom.stoer

25 
2,469 
Say for a simple hydrogen atom, an electron absorbs just the right amount of energy such that it jumps up from energy...

Aug813 07:44 PM
fzero

2 
503 
I have three quick questions regarding the experimental setup attached, in relation to Hardy’s Paradox.
What...

Aug813 06:55 PM
StevieTNZ

6 
656 
I have heard that Schrodinger's interpretation of his equation is different from the modern interpretation. What was...

Aug813 09:57 AM
Naty1

8 
732 
Suppose I know
H \psi(x) = \left( \frac{1}{2m} \Delta_x + V(x) \right) \psi(x) = E\psi(x).
Then
...

Aug813 08:11 AM
vanhees71

1 
421 
The recent activity on Bells theorem in PF has triggered my interest in the subject and I have added Bell to the list...

Aug713 07:47 PM
morrobay

79 
9,269 
I'm trying to understand the PBR proof as explained in their paper on arXiv (http://arxiv.org/abs/1111.3328). I'm...

Aug713 09:37 AM
Mathematech

3 
717 
To keep it simpler let take the electromagnetic (EM) field.
A photon, in one perspective, can be described as an...

Aug713 09:06 AM
San K

4 
603 
While reading Zurek paper Decoherence and the transition from quantum to classical  REVISITED, he makes the...

Aug713 08:37 AM
jfizzix

7 
534 
Alice entangles a pair of particles and sends one of the pair  particle B  towards Bob, keeping the other one ...

Aug713 04:13 AM
mfb

13 
1,013 
Dear Forum,
I have discovered by accident the method developed by Feynman and Stuekelberg to explain the origin of...

Aug713 03:44 AM
vanhees71

3 
455 
what is differences between collapse,reduction, decoherence , weak projection and strong projection in quantum...

Aug613 04:53 PM
kith

12 
1,599 
I am reading David Griffiths' book on Quantum Mechanics, and he usually says that the general solution to the TDSE,...

Aug613 04:13 PM
Positron137

4 
587 
Is it possible to explain simply what a Theory of Quantum Gravity is supposed to achieve/explain and why it is needed.

Aug613 04:09 PM
audioloop

10 
902 
Consider the vacuum state that is hypothesised to precede the moment of inflation in classical inflationary theory.
...

Aug613 12:59 PM
Maximise24

0 
446 
I am trying to understand the how the time evolution operator is used versus the Feynman propagate.
My limited...

Aug613 08:42 AM
qtm912

2 
433 
There is a statement in the Landau and Lifgarbagez volume on quantum mechanics that has had me puzzled for weeks now....

Aug613 07:48 AM
Geofleur

8 
673 
Hello All,
I am quiet new to the subject, so if anybody can help me.
The four fundamental forces of nature,...

Aug613 06:49 AM
mfb

1 
418 
Is there a connection between the Dirac four spinor and "spin up", i.e one of the four spinor states is spin up or are...

Aug613 05:12 AM
Bill_K

6 
668 
In conventional renormalization, for the selfenergy, is it possible to make a subtraction from a point not equal to...

Aug613 03:47 AM
andrien

3 
444 
h is a constant in Planck's equation but I have not seen anything written saying that the frequency cannot be...

Aug513 12:59 PM
Avodyne

11 
1,190 
I'm a bit confused by vacuum "fluctuations" (I know there is nothing fluctuating since vacuum is lorentz invariant)...

Aug513 11:27 AM
Sonderval

11 
831 
This question comes from section 2.3 of 'Quantum Field Theory' by Lewis Ryder. The discussion is on the Lie Group...

Aug413 04:38 AM
vanhees71

1 
438 
Hi,
From perusing books on QFT, I've gathered that the photon is written as a 4vector in field theory and...

Aug313 04:14 PM
king vitamin

2 
568 
I haven't found a comparison like this in any book that I have been reading so let me explain.
I decided that I...

Aug313 01:52 PM
71GA

11 
530 
I can't seem to wrap my head around the basic concept of the Schrodinger's cat experiment, the one in which a...

Aug313 12:54 PM
audioloop

6 
1,049 
I'm not exactly sure what I'm trying to ask, and I'm not very keen on laser physics, so bear with me.
If I have a...

Aug313 12:45 PM
wotanub

3 
483 
I'm seeing lots of underlying connections between the canonical formulism of QFT and QM. But I'm getting a bit...

Aug313 12:26 PM
The_Duck

5 
594 
Hi, I think I need a sanity check, because I've been working on this for a while and I can't see what I'm doing wrong!...

Aug313 11:11 AM
vanhees71

7 
1,456 
Hi
I am currently looking for the wavefunction of the bonding orbital of the hydrogen molecule. Does anybody here...

Aug213 04:09 PM
DrDu

1 
498 
So there's a new paper out by Yves Couder's group that observes quantum mechanicallike wave dynamics by averaging the...

Aug213 04:50 AM
patfada

18 
1,577 
Why this "quantization of energy" term occur in quantum mech? Is there any real physical example of quantization of...

Aug213 12:29 AM
tom.stoer

3 
647 
Delete this, please. Got further along in my thought process and asked a more relevant question.

Aug213 12:07 AM
Lanza52

0 
428 
I know that the Sun radiates vast amounts of energy partly due to nuclear fusion. I've also heard that nuclear fusion...

Aug113 05:04 PM
Positron137

8 
1,272 
Hi!
Do you tell me where i can found text which discuss about BEC's experimental aspects?
Thank you so much.

Aug113 02:58 PM
mathman

1 
447 
We are taught that a reason for the stability of half filled or fully filled orbitals is due to the high exchange...

Aug113 09:19 AM
hav0c

0 
2,006 
I've been reading Coleman's notes and the book on QFT by Ticciati. There they both place a lot of emphasis on...

Aug113 04:30 AM
DarMM

4 
716 
In the second edition of Mandl & Shaw QFT, on page 263, below eqn (12.75) he says (I am freely paraphrasing)
...

Aug113 03:38 AM
andrien

6 
548 
How does de Broglie postulate enter into the Schroedinger theory?

Jul3113 11:10 PM
gadong

10 
1,125 
I did some research on Wikipedia, and I quote from the write up on Real Particles:
"The term(Virtual Particles) is...

Jul3113 07:23 AM
jtbell

42 
4,215 