# 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: 2,573 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 36,455 This is not a homework problem, I hope im in the right forum. Suppose a magnetic field is applied long enough so... Oct10-07 10:31 PM di1026 7 1,596 Would a water wave leak just like an electron with a barrier? Sep28-12 01:27 AM haael 5 1,160 Ok so I'm currently revising my quantum theory course from this year and I've reached the section on the postulates... Mar20-13 09:06 AM QuantumMoose 4 686 If the answer is no, why? Is it possible to show that, given the state spaces we have for individual particles,... Oct6-08 04:18 AM vanesch 1 1,546 Heisenberg's uncertainty principle asserts a fundamental limit to the precision with which certain pairs of physical... Feb22-13 04:56 PM Mordred 23 1,514 What is Quantum Entanglement, and what does it do? I attempted at learning via online articles. Aug12-14 03:29 PM BiGyElLoWhAt 17 469 Why is Schrodinger's Cat entangled? Or is it not? I recently saw a poster on deviantart that said this:... Feb28-13 12:29 AM QuantumPixel 3 551 Can somebody explain to me exactly what Virtual Particles are (Like the Higgs Boson) and their respective virtual... Apr3-13 05:32 AM vanhees71 3 734 Can someone please help me out with mass terms in the general case for a lagrangian? It is known that for n scalar... Feb2-10 10:33 PM QuantumSkippy 0 1,968 Why is a solid state laser diode pen which emits eletromagnetic radiation in the form of a constant range of... Feb6-05 10:07 AM dextercioby 6 993 How you learn quantum physics I don't know. The math is complicated. I want to know a really hard equation that... May12-05 09:52 AM ArielGenesis 15 2,282 I was reading John Cramers column and came across the AAVP Effect. See references below. Basically, if you have... Jan29-06 04:40 AM QuantumUnbound 0 901 If I set up an interference experiment and make one path much longer than the other would I still see an interference... Feb9-06 05:53 AM vanesch 1 1,253 I was reading some some popular science rags and came across an article that espoused: But I didn't think all... Feb12-06 04:07 PM QuantumUnbound 0 2,491 I'm working on a research paper on Quantum Entanglement and came across something I don't understand. (I assume this... Dec17-09 11:21 PM QuantumVegan 8 2,004 http://imageshack.us/photo/my-images/40/63636538.png/ Feb14-13 02:39 AM QuantumWild 0 374 Before I make my post, I'd just like to introduce myself. My nickname is quantum_foam, as you can see (it's from the... Nov8-03 11:35 PM quantum_foam 4 1,248 In F. Wilczeks book, The Lightness of Being he describes his theory on the origin of mass. He explains, in much more... Jan10-09 01:56 PM malawi_glenn 2 811 OK, I have a problem with the many-world interpretation, namely the quantum suicide experiment. My problem: How... Jun28-06 11:32 PM koantum 58 7,991 Imagine you have two plates which can either be perfectly conducting or perfectly insulating by changing some... Nov5-06 07:34 PM Epicurus 8 1,919 I am reading chapter three of Huang's Statistical Mechanics and I have a problem with equation (3.22). Having... May19-12 08:03 AM QuArK21343 2 591 I am told that when an atom absorbs a photon, it jumps up an energy level, these are discrete levels of energy etc... Apr7-11 07:41 PM Einstein Mcfly 3 866 Hi, I have a ground state wavefunction, $$\psi_0(\xi) = A_0\exp(-\frac{1}{2}\alpha\xi^2),$$ (##\alpha## is a... Dec13-13 07:45 AM quarkgazer 0 387 Since it appears (so far) I am infringing no rule, here is another shameless copy/paste of a thread I started on... Oct24-08 06:19 PM Haelfix 1 1,177 Hi In double slit experiment our observe can change the past and in the entanglement our observe affact other... Dec13-13 09:44 AM Quarlep 10 756 Spin is a quantity of vector but I dont know how to add them ? Please be simple Thanks Aug14-14 09:19 AM Quarlep 2 166 I watched a video about particle physics and there I saw something strange(for me)... Aug18-14 02:18 AM MrRobotoToo 6 372 Hi I am curios about something we know E2=(mc2)2+(pc)2 than Paul Dirac maid E2=(mc2)2 than we know he find antimatter ... Aug29-14 01:41 PM Drakkith 3 135 In particle physics we know that total angular momentum is conserved and its equal to orbital angular momentum plus... Aug30-14 09:32 AM Quarlep 2 228 Why is there no kinetic energy term in said hamiltonian? Suppose I take a magnetic dipole in my hand, and I throw it... Dec24-05 11:17 AM abszero 3 6,290 I've always wondered what is considered to be 1 photon. We always see things like "When two of these particle collide,... Nov27-08 09:46 PM enotstrebor 34 10,895 I am reading the first chapter of Sakurai's Modern QM and from pages 30 and 32 respectively, I understand that (i)... Aug11-06 03:21 AM dextercioby 5 1,474 The SE is written in terms of a potential energy. It says, "given a particle in a region where the potential is... Oct4-06 08:29 PM Galileo 4 1,955 How should \Delta E \Delta t \geq \hbar/2 be interpreted? When does it apply? Delta t refers to the time of what? etc.... May7-12 06:40 AM Demystifier 10 8,326 In Reif's thermo book, one can read "Consider a substance which contains n magnetics atoms per unit volumes and... Nov13-06 10:57 AM quasar987 5 5,095 In my thermo text, they consider a diatomic molecule that is rotating about the axis joining the two atoms (also the... Nov14-06 09:42 PM quasar987 5 2,291 Hi, I have a problem with the very nature of time dependant perturbation theory (TDPT). In TDPT, we consider a... Mar16-07 02:23 PM vanesch 3 1,496 Hi, Is there an explicit formula for the eigenfunctions of the harmonic oscillator? By explicit, I mean "not... Mar27-07 03:30 AM christianjb 8 4,078 As I understand (from reading p. 2-06 of Marle's 1975 text on geometric quantization available on the french wiki page... Mar25-12 09:37 AM fzero 9 1,412 I have been reading about some quantum gravity topics, and am wondering: how many different modifications to the... Nov7-08 03:09 AM Haelfix 3 1,163