# Quantum Physics

- Mathematical description of the motion and interaction of subatomic particles. Quantum Mechanics & Field Theory
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 Meta Thread / Thread Starter Last Post Replies Views 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 30,373 Hi people. I just read this somewhere and I can't get my head around it. How is the Uncertainty Relation... Apr10-14 12:30 PM Bill_K 1 231 How to you get sets of complete basis functions using group theory ? For example , using triangle group for CH3 Cl ? Apr10-14 11:27 AM journeyman1986 2 287 From page 46 of "Modern Quantum Mechanics, revised edition", by J.J. Sakurai. In equation (1.6.24), \left = d... Apr10-14 10:35 AM bassam 5 779 I understand that a photon can be 'absorbed' by an electron resulting in the electron jumping to a higher energy level... Apr10-14 02:43 AM UltrafastPED 11 477 A few weeks ago I heard that Intel released 14nm CPU (Broadwell). After that I did some research and found out that by... Apr9-14 07:55 AM UltrafastPED 1 231 With the help of some kind PF folk I recently comprehended the idea of the quantum zeno effect. The idea now seems... Apr9-14 04:23 AM James MC 9 364 Hi folks! Apparently \Psi(x) = Ax^ne^{-m \omega x^2 / 2 \hbar} is an approximate solution to the harmonic... Apr8-14 08:47 AM vanhees71 6 341 I have read in a classical EM book: " The picture of conduction electrons moving freely in conductors is an... Apr8-14 04:04 AM UltrafastPED 3 241 Hi, suppose that the operators $$\hat{A}$$ and $$\hat{B}$$ are Hermitean operators which do not commute corresponding... Apr8-14 02:49 AM dextercioby 19 552 There is an argument that accurate sequential measurement of conjugate observables A and B on the same state is... Apr8-14 12:12 AM Ken G 21 588 I think I understand it but I prefer a response from a sci advisor rather than whatever someone put up on wikipedia. I... Apr7-14 10:10 PM bhobba 1 333 If we consider a bipartite system as in EPRB experiment we get the probabilities : p(++)=p(--)=1/4*(1-cos(theta))... Apr7-14 07:31 AM jk22 7 250 Hi, I was wondering if 2 electrons in an 1s-orbital of a hydrogen anion (or alternatively neutral helium) are... Apr7-14 03:59 AM xortdsc 6 398 Instantaneous action-at-a-distance (which is how we explain quantum entanglement) implies event-simultaneity, but we... Apr6-14 06:08 PM DevilsAvocado 21 889 Hi all! I am currently reading a review "Area law for the entanglement entropy" by Eisert, Cramer and Plenio... Apr6-14 05:16 PM atyy 3 309 Is the transformation of an operator under INFINITESIMAL unitary transformation, U^-1AU or UAU^-1?? I saw that two... Apr6-14 05:15 PM Matterwave 3 230 Typical introductions to path integrals start with asking for the value of \langle x_1,t_1 | x_2,t_2 \rangle. This is... Apr6-14 04:35 PM pellman 4 245 Hello! I've only just come across the Unruh Effect...so please bear with me! Say you have a long pole, and you... Apr6-14 04:20 PM craigi 5 378 I have read the follow bock ... Apr6-14 02:57 PM alejandrito29 0 224 according to sommerfield quantization rule "for any physical system in which the co ordinates are periodin functions... Apr6-14 02:05 PM Nugatory 1 197 Here's a puzzle that has been bothering me lately. I take as given the following: E = h\nu (Planck) energy... Apr6-14 10:25 AM ZapperZ 2 300 This idea is brought on by this paper: http://arxiv.org/abs/1210.5646 and the idea proposed by Asher Peres:... Apr6-14 09:52 AM naima 3 298 I usually know how to manipulate bras and kets. But I probably found difficulty because of the double summation. How... Apr6-14 07:15 AM kith 7 275 As per Heinsburg uncertainity principle, Δx*Δp≈h. It means we cannot actually measure simentenously both position and... Apr6-14 06:04 AM HomogenousCow 8 433 I considered the covariance of 2 spin 1/2 as a non linear operator : A\otimes B-A|\Psi\rangle\langle\Psi|B. The... Apr6-14 12:55 AM jk22 7 351 I am an accountant, not a physicist, but I find physics pretty interesting. One thing that I see reported on many a TV... Apr5-14 10:04 PM bhobba 20 650 Hi All, Would it be reasonable to state that, together with the quantum mechanics appearance, there appeared also a... Apr5-14 09:44 PM bhobba 8 317 I am a retired electrical engineer, now able to get back to studying what I really enjoy - mathematics and physics. ... Apr5-14 08:05 PM Ken G 5 355 My textbook says the ground state energy of the QSHO is given by 1/2*h_bar*w and that this is the minimum energy... Apr5-14 01:37 PM WannabeNewton 1 174 consider the finite square well: V = -Vo between x=-a and x=a, V=0 elsewhere Now for scattering states,... Apr5-14 12:54 PM user3 0 180 Hey PF, i'm in my intro quantum course and was wondering if there is an intuitive reason why the allowed energies in... Apr5-14 12:40 PM PsychonautQQ 0 136 Consider this: Two antennas are set up in a vacuum. They both radiate electromagnetic waves of the exact same... Apr5-14 11:12 AM user3 2 154 What would be the scale, in which Newtonian mechanics dissolve and QM becomes the sole victor for accurate... Apr5-14 01:51 AM UltrafastPED 3 201 Are the quantum mechanical terms "probability amplitude" and "probability density" used interchangeably? Apr4-14 09:16 PM jtbell 4 245 So starting from the time dependent schrodinger equation I perform separation of variables and obtain a time and... Apr4-14 12:05 PM Chopin 4 259 Hello, Hi There I am trying to obtain the relations of the conserved charges of the stress tensor, it has 4, one is... Apr3-14 03:33 PM WarDieS 2 237 If a particle comes from +infinite and collides with a potential of the form : V = ∞ , x < 0 (I) -V0 ,... Apr3-14 02:03 PM jaytech 1 188 Hi, Are the multiverses that come up in some cosmological theories, e.g. inflation, in any way related to the... Apr3-14 09:19 AM craigi 6 604 Hello there.I am a master student in High Energy Physics. I am trying to get started in AdS/CFT and holography. I... Apr3-14 02:36 AM metamathphys 0 190 Hello. Apparently for SU(N) gauge theories there is a perturvative approach call "large N expansion". I need a... Apr3-14 02:25 AM metamathphys 3 340

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