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Quantum Physics

- Mathematical description of the motion and interaction of subatomic particles. Quantum Mechanics & Field Theory
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Jan16-12 Greg Bernhardt
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Feb23-13 08:38 AM
ZapperZ
1 35,347
When the Z boson is around can a neutrino interact with a particle other than an electron? And how does the neutrino...
T 06:07 PM
Rob Hoff
0 1
what did feynman mean when he said "positrons are electrons travelling backward in time"?
T 04:31 PM
PeterDonis
10 231
In chapter 2.2 of Feynman's book on QFT, he states that the probability amplitude of a particle going from a to b is...
T 03:51 PM
atyy
4 127
When drawing conclusions from this most important and profound theorem, I wonder if somebody has interpreted its proof...
T 02:24 PM
gill1109
76 5,609
This quantum vacuum thing... i'm thinking about these virtual particles popping in and out of existence. Does that...
T 02:05 PM
Avodyne
6 254
I'm not 100% sure that this is the right forum to post this, but I think that the people who read the Quantum Physics...
T 11:14 AM
gill1109
103 2,491
I am curious what a photon looks like if we could observe it pass through space. It's also supposed to be oscillation...
T 10:06 AM
bhobba
13 285
Forgive me if this is a dumb question; from what I've been reading an electron can exist simultaneously in two places....
T 06:21 AM
Drakkith
20 792
I want to discuss the theorem proved in the article "Quantum states and generalized observables: a simple proof of...
T 06:00 AM
micromass
31 3,130
hey I got a questions and appreciate obv any reply. Im regarding to Capitel 12, page 128ff. from Gustafson, Sigal;...
T 04:47 AM
pat1enc3_17
3 284
Hello everyone, this has been on my mind for a while and I finally realized I could just ask on here for some input :)...
Y 03:51 PM
dextercioby
5 295
hi there... what is a point in a space? classical math tells us that a point is: - an exact location on a...
Y 12:24 AM
bhobba
47 1,527
As the only thread I've ever started before (http://www.physicsforums.com/showthread.php?t=369328 ) attracted a lot of...
Jul27-14 01:53 PM
akhmeteli
77 7,274
if we have two non-interacting particles of mass M in a one-dimensional harmonic oscillator potential of frequency ω,...
Jul27-14 01:04 PM
Jilang
27 642
The definition I have for a 2-point correlator is $$\langle \phi_1(x_1)\phi_2(x_2)\rangle = \frac{1}{Z} \int \mathcal...
Jul27-14 12:58 AM
MathematicalPhysicist
24 1,099
I can tell this is simple, but I'm just not seeing it: (pages 146-147) Radial equation = d^{2}u/dp^{2} = _{0}/p +...
Jul26-14 09:32 PM
strangerep
4 317
I am new here and was wondering what Schrodinger's Cat is and why it matters.
Jul26-14 09:15 PM
Nugatory
1 302
I had a course of computational physics in university. When the professor wanted to non-dimensiolize the Schrodinger...
Jul26-14 03:36 PM
Jazzdude
3 338
Hello Forum, The electromagnetic field EM must be treated relativistically because it travels at the speed of light...
Jul26-14 10:16 AM
tom.stoer
3 355
Hey Everyone, Just wondering what would be a good experimental investigation involving a radioactive source and the...
Jul26-14 01:36 AM
Nico123
3 389
Hi all, I'm trying to compute the effect that a magnetic field has on the singlet and triplet states of positronium. ...
Jul25-14 11:24 PM
"pi"mp
2 312
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...
Jul25-14 09:17 PM
bhobba
13 693
Forgive me if some of my question sounds misguided or misinformed - I'm new to the flux pinning game. I want to be...
Jul25-14 08:58 PM
jtmarmon
0 293
Dirac left me in the dust at this step. Can someone please help me through it. I understand from Susskind's...
Jul25-14 08:43 PM
marcusl
5 389
Hi, I'm entering graduate school this fall and was looking to improve my computational physics knowledge. I have...
Jul25-14 08:00 PM
bhobba
1 285
Hey there Im preparing for an oral exam in mathematical quantum physics. not sure if this fits in here very...
Jul25-14 03:44 AM
vanhees71
1 330
I've got a problem which is asking for the eigenvalues and eigenstates of the Hamiltonian H_0=-B_0(a_1...
Jul25-14 12:20 AM
Shyan
4 401
Just a simple question. How do we know the detector isn't messing up the double slit experiment when a single photon...
Jul24-14 10:13 PM
atyy
70 2,312
So I've been self-studying from Griffiths Intro to QM to get back in shape for graduate school this fall, and I guess...
Jul24-14 09:25 PM
strangerep
1 340
On page 86 of The Principles of Quantum Mechanics, Dirac left me in his dust. I quote: ...
Jul24-14 06:03 PM
Fredrik
2 360
Does modern physics allow for the existence of massless fermions?
Jul24-14 12:43 PM
atyy
2 343
What exactly is all this 'matrix elements of vectors' stuff that Landau is talking about? I don't mean to ask...
Jul24-14 09:10 AM
atyy
1 305
Hello Everyone, I am currently reading about when the Quantum Mechanical Theory becomes relevant. A term that...
Jul24-14 07:29 AM
Bashyboy
4 435
I have a few problems understanding the double slit experience and the behavior of photos due to simple observation. ...
Jul23-14 11:31 PM
bhobba
15 506
I am learning identical particles recently, but I have some problem interpreting what I am writing down. So if we have...
Jul23-14 04:26 PM
Jano L.
5 677
The first postulate of quantum mechanics says that every physical system is associated with a separable complex...
Jul23-14 08:27 AM
vanhees71
6 674
what is the INNER QUANTUM number ?
Jul23-14 08:07 AM
bahamagreen
6 538
Hi all! I am wondering if there is an interpretation of QM where the future is "set in stone" (for lack of a better...
Jul22-14 11:46 PM
bhobba
47 3,037
How do we know/observe a particle annihilating a anti-particle? Is it impossible to theorize that in the early...
Jul22-14 02:55 PM
phinds
4 599
I thought that it would be possible to get a single photon to a double slit which would be sufficiently coherent to...
Jul22-14 10:28 AM
naima
11 656

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