
Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Feb2313 08:38 AM
ZapperZ

1 
35,505 
I have never been to the pyramids in Egypt. I'd love to go one day. I am sure their configuration will be just as...

Jul2514 09:17 PM
bhobba

13 
780 
Forgive me if some of my question sounds misguided or misinformed  I'm new to the flux pinning game.
I want to be...

Jul2514 08:58 PM
jtmarmon

0 
345 
Dirac left me in the dust at this step. Can someone please help me through it.
I understand from Susskind's...

Jul2514 08:43 PM
marcusl

5 
437 
Hi,
I'm entering graduate school this fall and was looking to improve my computational physics knowledge. I have...

Jul2514 08:00 PM
bhobba

1 
338 
Hey there
Im preparing for an oral exam in mathematical quantum physics.
not sure if this fits in here very...

Jul2514 03:44 AM
vanhees71

1 
392 
I've got a problem which is asking for the eigenvalues and eigenstates of the Hamiltonian H_0=B_0(a_1...

Jul2514 12:20 AM
Shyan

4 
464 
Just a simple question. How do we know the detector isn't messing up the double slit experiment when a single photon...

Jul2414 10:13 PM
atyy

70 
2,583 
So I've been selfstudying from Griffiths Intro to QM to get back in shape for graduate school this fall, and I guess...

Jul2414 09:25 PM
strangerep

1 
407 
On page 86 of The Principles of Quantum Mechanics, Dirac left me in his dust. I quote:
...

Jul2414 06:03 PM
Fredrik

2 
415 
Does modern physics allow for the existence of massless fermions?

Jul2414 12:43 PM
atyy

2 
406 
What exactly is all this 'matrix elements of vectors' stuff that Landau is talking about?
I don't mean to ask...

Jul2414 09:10 AM
atyy

1 
360 
Hello Everyone,
I am currently reading about when the Quantum Mechanical Theory becomes relevant. A term that...

Jul2414 07:29 AM
Bashyboy

4 
484 
I have a few problems understanding the double slit experience and the behavior of photos due to simple observation.
...

Jul2314 11:31 PM
bhobba

15 
574 
I am learning identical particles recently, but I have some problem interpreting what I am writing down. So if we have...

Jul2314 04:26 PM
Jano L.

5 
724 
The first postulate of quantum mechanics says that every physical system is associated with a separable complex...

Jul2314 08:27 AM
vanhees71

6 
731 
what is the INNER QUANTUM number ?

Jul2314 08:07 AM
bahamagreen

6 
579 
Hi all! I am wondering if there is an interpretation of QM where the future is "set in stone" (for lack of a better...

Jul2214 11:46 PM
bhobba

47 
3,250 
How do we know/observe a particle annihilating a antiparticle?
Is it impossible to theorize that in the early...

Jul2214 02:55 PM
phinds

4 
656 
I thought that it would be possible to get a single photon to a double slit which would be sufficiently coherent to...

Jul2214 10:28 AM
naima

11 
708 
If:
##\hat{H} \psi (x) = E \psi (x)##
where E is the eigenvalue of the *disturbed* eigenfunction ##\psi (x)##
...

Jul2214 06:46 AM
Sunnyocean

2 
645 
One of the first things about QM we were taught in my undergraduate physics program is the deBroglie relation:
λ =...

Jul2214 06:24 AM
bhobba

16 
1,794 
So we are at a distance from the black hole R>2GM/c^2 where quantum fluctuations happen all the time.
How is it...

Jul2214 05:58 AM
phinds

5 
647 
Since the electromagnetic and the weak force unify at high energies, why do physicist continue to count four...

Jul2214 05:37 AM
kith

2 
615 
my question is about the nocommunication theorem in quantum mechanics:
Assume that i have a pair of entangled...

Jul2214 04:43 AM
mix609

4 
537 
Experiment:
Imagine the dalayed time quantum eraser experiment, except the pair of "idler" photons(which would...

Jul2114 04:41 PM
bcrelling

0 
475 
Hi All,
I am trying too undestand the slit test which shows waveparticle duality. Please correct me if I am wrong on...

Jul2114 03:22 PM
Cthugha

13 
1,955 
I've visited a great many sites and looked at papers to fully understand this, and still have some confusion regarding...

Jul2114 02:57 PM
Cthugha

16 
1,020 
Hello everyone,
I had a look on G.t'Hooft paper about one loop divergences and I would like to know how can I obtain...

Jul2114 02:04 PM
Maya211

0 
473 
If the parity operator ##\hat{P}## is hermitian, then:
##\langle \phi  \hat{P}  \psi \rangle = (\langle \psi ...

Jul2114 09:57 AM
Sunnyocean

3 
578 
Consider a composite particle. Its spin is determined by the spins of its constituent particles. But the constituent...

Jul2114 05:36 AM
Vanadium 50

9 
621 
To start, we have:
ψ=e^{i(kx+wt)}
ψ_x=ikψ
ψ_{xx}=k^2ψ
λ=\frac{h}{p}
k=\frac{2π}{λ}
E=\frac{p^2}{2m}+V
Then,...

Jul2014 10:45 PM
Jd0g33

12 
779 
There have been many posts requesting a quantum mechanical explanation for the refraction of light through glass, but...

Jul2014 09:26 PM
Jd0g33

4 
361 
At what point does matter stop having the ability to function as both a particle and a wave?
In the early 1800s...

Jul1914 09:22 PM
bhobba

2 
279 
Hi,
I was wondering whether we are sure (I know, strong word) that decoherence is the mechanism that takes us from...

Jul1914 09:07 PM
bhobba

7 
623 
I get a bit confused seeing where Feynman's many paths fits in to the Manyworlds interpretation. Both start off with...

Jul1914 09:24 AM
nomadreid

9 
786 
I recognize the practical aspects of this would be absurd, but I must admit the premise of what it would take to put a...

Jul1914 09:07 AM
Water nosfim

14 
946 
I am curious about recent progress in relativistic Bohmian mechanics. Finding a review is proving difficult (The...

Jul1914 08:12 AM
Demystifier

2 
304 
The relativistic massenergymomentum relation m^2=E^2p^2 predates quantum mechanics by a couple of decades. It...

Jul1814 10:58 PM
strangerep

23 
1,387 
L=0 Suborbital Configuration
These questions are directed at resident theoretical quantum physicists in PF
...

Jul1814 05:28 PM
Vanadium 50

18 
1,335 
In a real doubleslit experiment, the kind of pattern obtained will be different as an observer (which may or may not...

Jul1714 08:40 PM
bhobba

9 
575 