# Quantum Physics

- Mathematical description of the motion and interaction of subatomic particles. Quantum Mechanics & Field Theory
 Meta Thread / Thread Starter Last Post Replies Views Views: 90,083 Announcement: Follow us on social media and spread the word about PF! Jan16-12 Pinned: Quantum Physics Forum Rules Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a... Feb23-13 08:38 AM ZapperZ 1 34,636 Hi I'm studying for my course of quantum chemistry and I have some issues with applying the Hückel or thight... Jun11-12 07:54 PM JorisL 2 1,281 Matter (deBroglie) waves is a concept and it's existence is not confirmed (?)..that said, We know that - The de... Jun11-12 12:44 PM Simon Bridge 3 874 Jun10-12 08:06 PM robertjford80 0 761 In the fabric of the Cosmos by Brian Greene there is an experiment using the example of Mulder and Scully and boxes.... Jun10-12 04:00 PM Ken G 4 1,126 Two spherically symmetric potentials, the Coulomb potential and the isotropic harmonic oscillator potential, lead to... Jun10-12 04:58 AM A. Neumaier 17 2,727 I have read that when 2 Hydrogen atoms come together their individual spacial wavefunctions overlap in the following... Jun10-12 03:44 AM cgk 1 984 how does/would LHV (local hidden variables) theory explain the phenomena of: 1. quantum entanglement swapping... Jun10-12 01:10 AM San K 3 1,045 If we were to introduced a set of un-entangled, but same polarized, photons as control experiment what would the... Jun9-12 11:58 PM lugita15 3 959 hello. it's the first time I use this site I hope that I find the answer of my question: does the hausdorff formula... Jun9-12 11:52 PM strangerep 2 996 Hi all, I have recently been reading the book The Method of Second Quantization'' by Felix Berezin but I got trapped... Jun9-12 11:26 PM strangerep 1 850 We often just say that the eigenvalues of \hat{L}^2 are \hbar^2l(l+1), but does this apply to all kinds of potentials... Jun9-12 03:47 PM fzero 2 798 Schrödinger had proved/predicted QE theoretically prior to experimental (though not loop-hole free) verification. ... Jun9-12 07:09 AM Simon Bridge 1 737 The general evolution of a ket |\psi\rangle is according to -i\hbar\frac{d}{dt}|\psi\rangle=H|\psi\rangle without... Jun9-12 06:59 AM youngurlee 7 1,272 why is the function must be normalize ? what is the meaning of normalization I know it's ∫ψψ*=1 but what it... Jun9-12 02:02 AM sciboudy 3 705 I am interested in knowing that in QM what vector/tensor operators are? In fact how do they differ from scalar... Jun8-12 04:41 PM Bill_K 3 733 Electrons paired up in an orbital have anti-parallel spins. One rotates in clockwise direction and the other in... Jun8-12 03:13 PM Naty1 4 1,013 Hi, Have there been done variations of double slit experiment, particularly I'm interested in following scenarios:... Jun8-12 01:05 PM Simon Bridge 3 817 In the experiments done with superconducting rings by Delft and Stony Brook, currents are shown to be moving in both... Jun8-12 04:22 AM Dadface 63 6,554 Hi! I'am young and am very excited about Physics. I would like to read the research papers written by famous... Jun8-12 02:33 AM M Quack 3 1,160 Hello, not sure if I'm typing the question in the right place, but I encountered this question when going through... Jun7-12 03:55 PM Bill_K 5 1,089 I am having troubles finding anything online that reveals the conceptual concerns relating to the probability... Jun7-12 02:39 PM James S Saint 18 2,141 First time poster, more of a nerd than an academic. So virtual particles, can they pop into and out of existence... Jun7-12 12:20 PM FrY-Yau 5 871 Quantum field theory predicts a value for the cosmological constant that is 123 orders of magnitude larger than the... Jun7-12 08:10 AM Sonderval 9 1,832 I have some questions concerning the first two chapters of Ginsparg's text on CFT, which can be found here 1. In... Jun6-12 05:39 PM physicus 4 1,244 Okay so this is my first post after like 15 min of tying to figure out how to post. Anyways I have been reading about... Jun6-12 11:39 AM juzzy 4 1,036 The empirical method of linear combination of atomic orbitals is not hard to understand. There is one thing about this... Jun6-12 06:21 AM Ken G 4 724 In regards to measuring two photons in the 45/135 basis using 22.5 wave plates and PBS orientated in the H/V basis: ... Jun5-12 11:32 PM StevieTNZ 0 551 Basically I have looked up both out of curiosity and it just flew right over my head. I have a general understanding... Jun5-12 07:41 PM juzzy 1 1,005 Well, am an Alevel student... Edexcel.. I just find quantum physics a really really confusing topic.. My question is... Jun5-12 05:40 PM Matterwave 4 540 Wikipedia defines a field as "a physical quantity associated with each point of spacetime". So contrary to a particle,... Jun5-12 03:43 PM A. Neumaier 10 1,691 I explained to myself that I don't fall through the ground due to electrons repelling. Using classical electrostatic... Jun5-12 03:19 PM unusualname 6 1,577 talking about ψ-epistemic, ψ-ontic and ψ-complete models. How would the world appear to us if its ontology was... Jun5-12 03:15 PM DrChinese 7 1,542 Hi all, There is a Hamiltonian in terms of "a" and "a^{dagger}"bosonic operators... Jun5-12 11:23 AM Bill_K 2 993 if vacuum has virtual particles it should have temperature right.? If a perfect vacuum exists ie without any virtual... Jun5-12 02:14 AM Ger 3 868 This is, when it all comes around, just math. I am asked to prove that if the schroedinger equation looks like: ... Jun4-12 11:48 PM freddyfish 2 1,588 I have read in different places something like the following: Hermitian operators have real eigenvalues Hermitian... Jun4-12 06:34 PM Matterwave 1 958 Hello, I have a problem with the two seemingly conflicting descriptions of the energy transfer from a photon to an... Jun4-12 05:59 PM kapitan90 4 1,841 I couldn't find out if the following article had been discussed (it is probably well known), but there were many... Jun4-12 04:28 PM yoda jedi 7 1,160 I doing some reading on why the wave-function is complex. From what I can tell, it's due to its evolution by unitary... Jun4-12 01:21 PM friend 4 1,069 I believe that in qft the particle states are eigenvectors of the Hamiltonian(which also commutes with the number... Jun4-12 11:47 AM A. Neumaier 16 1,987