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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 36,445
I mean, which is the operational mechanism? Is it deterministic? I mean, can I "grab" two particles and make them...
Aug12-13 09:24 PM
Simon Bridge
1 943
Hello. I'm trying to make a "Mach–Zehnder interferometer", that would show a same-named paradox. In plain words:...
Aug12-13 05:55 PM
Cthugha
1 372
Hello there! I´ve tried searching the internet but seems to be in need of a heavy book for this answer. I stumbled...
Aug12-13 03:26 PM
TrifePhysics
7 704
I've been looking for work on this, and I was hoping someone could confirm or deny that anyone has done any before. I...
Aug11-13 09:21 PM
michael879
2 594
This is just a little note describing something that may be common knowledge, but I was confused about, myself, which...
Aug11-13 08:35 PM
stevendaryl
10 932
Hello everybody, I have a short question about the renormalization scale. For dimensional regularization we...
Aug11-13 08:08 PM
king vitamin
1 462
Is there a smallest possible amount of energy? Like, one where all energy quantities in the universe are a multiple of...
Aug11-13 05:54 PM
Vanadium 50
1 439
hi i know what is coherent state, but i read this text in an article and i don't understand this " if we wish to...
Aug11-13 03:56 AM
strangerep
9 966
hi i read some text about causality and determinism, but i can't exactly distinguish between them. what's really...
Aug11-13 03:14 AM
king vitamin
4 558
Two questions 1) The total orbital spin angular momentum is given as L2=l(l+1). What is the source of or meaning...
Aug10-13 06:05 PM
Simon Bridge
4 747
The way I saw it, we lived in a deterministic universe. And all the claimed randomness in the quantum world was just...
Aug10-13 05:16 AM
bhobba
13 1,084
When a particle decays into two different particles, they are said to be entangled. If one of these is absorbed by an...
Aug10-13 01:00 AM
meBigGuy
1 407
Binding energy equations can be derived for the main spherical orbitals of hydrogen. If derived correctly, the...
Aug9-13 11:30 PM
sb635
19 1,190
According to QM the ground state of the quantized empty space is not considered to be empty but as a fluctuating sea...
Aug9-13 02:21 PM
tom.stoer
23 1,737
hi i read some texts about problems of quantum gravity, but i don't i was confused. anybody can help me to...
Aug9-13 02:05 PM
Vanadium 50
1 427
Hello! I have worked with Green's functions in electrodynamics and have now started reading qft. First I...
Aug9-13 09:47 AM
Kontilera
6 552
Hi All, I would like to know why in the infinite well problem, after having solved the time independent SE, we are...
Aug9-13 08:05 AM
gadong
9 678
hi there. I studied physics for years, even went as far as getting a PhD. but that was 13 years ago, since then...
Aug9-13 12:07 AM
tom.stoer
25 2,473
Say for a simple hydrogen atom, an electron absorbs just the right amount of energy such that it jumps up from energy...
Aug8-13 07:44 PM
fzero
2 503
I have three quick questions regarding the experimental set-up attached, in relation to Hardy’s Paradox. What...
Aug8-13 06:55 PM
StevieTNZ
6 658
I have heard that Schrodinger's interpretation of his equation is different from the modern interpretation. What was...
Aug8-13 09:57 AM
Naty1
8 734
Suppose I know H \psi(x) = \left( -\frac{1}{2m} \Delta_x + V(x) \right) \psi(x) = E\psi(x). Then ...
Aug8-13 08:11 AM
vanhees71
1 424
The recent activity on Bells theorem in PF has triggered my interest in the subject and I have added Bell to the list...
Aug7-13 07:47 PM
morrobay
79 9,299
I'm trying to understand the PBR proof as explained in their paper on arXiv (http://arxiv.org/abs/1111.3328). I'm...
Aug7-13 09:37 AM
Mathematech
3 718
To keep it simpler let take the electromagnetic (EM) field. A photon, in one perspective, can be described as an...
Aug7-13 09:06 AM
San K
4 606
While reading Zurek paper Decoherence and the transition from quantum to classical -- REVISITED, he makes the...
Aug7-13 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 -...
Aug7-13 04:13 AM
mfb
13 1,019
Dear Forum, I have discovered by accident the method developed by Feynman and Stuekelberg to explain the origin of...
Aug7-13 03:44 AM
vanhees71
3 455
what is differences between collapse,reduction, decoherence , weak projection and strong projection in quantum...
Aug6-13 04:53 PM
kith
12 1,604
I am reading David Griffiths' book on Quantum Mechanics, and he usually says that the general solution to the TDSE,...
Aug6-13 04:13 PM
Positron137
4 588
Is it possible to explain simply what a Theory of Quantum Gravity is supposed to achieve/explain and why it is needed.
Aug6-13 04:09 PM
audioloop
10 907
Consider the vacuum state that is hypothesised to precede the moment of inflation in classical inflationary theory. ...
Aug6-13 12:59 PM
Maximise24
0 448
I am trying to understand the how the time evolution operator is used versus the Feynman propagate. My limited...
Aug6-13 08:42 AM
qtm912
2 434
There is a statement in the Landau and Lifgarbagez volume on quantum mechanics that has had me puzzled for weeks now....
Aug6-13 07:48 AM
Geofleur
8 676
Hello All, I am quiet new to the subject, so if anybody can help me. The four fundamental forces of nature,...
Aug6-13 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...
Aug6-13 05:12 AM
Bill_K
6 674
In conventional renormalization, for the self-energy, is it possible to make a subtraction from a point not equal to...
Aug6-13 03:47 AM
andrien
3 446
h is a constant in Planck's equation but I have not seen anything written saying that the frequency cannot be...
Aug5-13 12:59 PM
Avodyne
11 1,199
I'm a bit confused by vacuum "fluctuations" (I know there is nothing fluctuating since vacuum is lorentz invariant)...
Aug5-13 11:27 AM
Sonderval
11 833
This question comes from section 2.3 of 'Quantum Field Theory' by Lewis Ryder. The discussion is on the Lie Group...
Aug4-13 04:38 AM
vanhees71
1 438

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