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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
1 36,471
Although it is well known that a series of individual photons will build up an interference pattern in a double slit...
Apr22-13 05:49 PM
9 5,293
Ok so the equation E= hf about the energy of a photon, I'm having a problem understanding energies to do with photons....
Apr22-13 05:04 PM
5 678
Lets say we have a potential step with regions 1 with zero potential ##W_p\!=\!0## (this is a free particle) and...
Apr22-13 12:16 PM
15 1,349
1.does antiparticles really travels backwards in time or is it just used to describe feynman diagrams and diracs...
Apr22-13 09:56 AM
14 1,183
I was reading Griffiths's book on quantum mechanics. In chapter 6, he tried to derive the spin-orbit coupling using...
Apr22-13 07:14 AM
2 532
Is there an intuitive way of understanding these terms? I understand the mathematics that shows why there are 3 states...
Apr22-13 01:49 AM
2 619
Exotic matter have a negative mass and goes in the opposite direction of the force applied to it. These properties...
Apr21-13 09:02 PM
5 598
I know there's a flaw here as superluminal communicaton is impossible. I was considering this scenario: As with...
Apr21-13 03:40 PM
7 925
From 'Modern Quantum Mechanics, revised edition' by J.J. Sakurai, In page 44 the translation (spacial displacement)...
Apr21-13 02:55 PM
2 618
Do you think that: Single particle interference is explainable via entanglement? For example: in the single...
Apr20-13 07:21 PM
Vanadium 50
5 869
I am really confused about this! So people thought that as wavelength increases for electromagnetic radiation,...
Apr20-13 01:11 PM
5 635
In the infinite square well, the stationary states solutions form a complete set, and therefore I can write a function...
Apr20-13 07:33 AM
5 628
I need help proving the identity ...
Apr19-13 11:46 PM
27 4,352
Hi, I am currently studying quantum field theory with worldwidely used text written by Peskin and Schroeder. On page...
Apr19-13 10:41 PM
2 541
Hi guys, is there a reason why the energy of the harmonic oscillator is always written as:$$ E_{n} = \hbar \omega...
Apr19-13 02:38 PM
1 488
why do we have moving detectors in Delayed Choice Quantum Eraser (DCQE) and similar experiments? Why don't we have...
Apr19-13 02:00 PM
San K
0 378
Hi everyone, I'm stuck on the concept of the rotation operator in QM. From what I understand, one constructs a...
Apr19-13 12:58 AM
5 863
Does anyone have a link or a reference to somewhere where these rules are explicitly derived for phi-four theory?
Apr18-13 08:46 PM
4 973
I'm not clear as to how the overall interference pattern (or lack thereof) observed in the quantum eraser experiments...
Apr18-13 06:46 PM
6 728
With reference to the following lecture by Leonard Susskind :...
Apr18-13 02:14 PM
1 482
If I use hydrogen-like orbitals for other atoms, how are the number of nodes and probability density affected?
Apr18-13 12:01 PM
2 519
It is often said that the photon is the long range force carrier like the static force between electrons. Lets say we...
Apr18-13 11:48 AM
2 670
Also how can local causality be violated?
Apr18-13 09:52 AM
1 436
Hi I am teaching myself QFT using peskin and schroeder and have a few problems 1) On page the author goes from \int...
Apr18-13 09:49 AM
0 395
Hi Guys For all people interested in Schrodinger's Cat check out Leonard Susskind's explanation - very lucidly...
Apr18-13 09:47 AM
0 845
Dear all, I am working on 8 band k.p model and I am intrested in the way of derivation of explicit analytical...
Apr18-13 08:41 AM
0 426
The principle states: δxδp≥h/4π I understand what it means and ive seen in proven both theoretically and...
Apr17-13 08:00 PM
4 746
In its standard formulation, the CPT theorem says that any local Lorentz-covariant quantum field theorem will be...
Apr17-13 07:22 PM
2 547
Why did Max Planck refer to his own radiation law...
Apr17-13 05:07 PM
1 885
In the one moment you accept something in the other you're not sure why? Why probability density in quantum mechanics...
Apr17-13 12:14 PM
11 1,368
I am very confused by the treatment of Peskin on representations of Lorentz group and spinors. I am confronted with...
Apr17-13 10:29 AM
13 1,106
I can't seem to find a definitive answer to my questions surrounding this topic, every textbook I read is rather...
Apr17-13 09:47 AM
4 625
What is the quantum of an electromagnetic wave? Quantum of light is photon. What is the quantum of a gamma ray or an...
Apr17-13 06:53 AM
4 594
Hi guys having a little trouble with two-qubit state multiplication. Could you tell me how you work out the...
Apr17-13 05:32 AM
5 642
The Wigner function, W(x,p)\equiv\frac{1}{\pi\hbar}\int_{-\infty}^{\infty} ...
Apr17-13 05:01 AM
6 771
Hi all! I was reviewing some basic quantum mechanics, and I was trying to 'derive' the equation -i \hbar...
Apr16-13 06:38 PM
8 987
We know electric current travels around 200000 km/s.. Yet electrons are moving way much slower, just acting as a...
Apr16-13 04:34 PM
4 648
As an atmospheric physics major I am familiar with electromagnetic radiation in the atmosphere and what dictates what...
Apr16-13 03:06 PM
5 858
In the chapter on partial wave analysis in Griffiths's Introduction to Quantum Mechanics, he considers a spherically...
Apr15-13 08:33 PM
Meir Achuz
4 1,085
Reflection/refraction of light is due to the absorption of photons by electrons in the governing atoms, and is then...
Apr15-13 08:29 PM
Meir Achuz
4 533

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