# 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 Views: 117,976 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 35,347 When the Z boson is around can a neutrino interact with a particle other than an electron? And how does the neutrino... T 06:07 PM Rob Hoff 0 1 what did feynman mean when he said "positrons are electrons travelling backward in time"? T 04:31 PM PeterDonis 10 231 In chapter 2.2 of Feynman's book on QFT, he states that the probability amplitude of a particle going from a to b is... T 03:51 PM atyy 4 127 Bell's theorem ( 1 2 3 ... Last) When drawing conclusions from this most important and profound theorem, I wonder if somebody has interpreted its proof... T 02:24 PM gill1109 76 5,609 This quantum vacuum thing... i'm thinking about these virtual particles popping in and out of existence. Does that... T 02:05 PM Avodyne 6 254 The Born Rule in Many-Worlds ( 1 2 3 ... Last) I'm not 100% sure that this is the right forum to post this, but I think that the people who read the Quantum Physics... T 11:14 AM gill1109 103 2,491 I am curious what a photon looks like if we could observe it pass through space. It's also supposed to be oscillation... T 10:06 AM bhobba 13 285 Forgive me if this is a dumb question; from what I've been reading an electron can exist simultaneously in two places.... T 06:21 AM Drakkith 20 792 I want to discuss the theorem proved in the article "Quantum states and generalized observables: a simple proof of... T 06:00 AM micromass 31 3,130 hey I got a questions and appreciate obv any reply. Im regarding to Capitel 12, page 128ff. from Gustafson, Sigal;... T 04:47 AM pat1enc3_17 3 284 Hello everyone, this has been on my mind for a while and I finally realized I could just ask on here for some input :)... Y 03:51 PM dextercioby 5 295 What is a point? ( 1 2 3) hi there... what is a point in a space? classical math tells us that a point is: - an exact location on a... Y 12:24 AM bhobba 47 1,527 As the only thread I've ever started before (http://www.physicsforums.com/showthread.php?t=369328 ) attracted a lot of... Jul27-14 01:53 PM akhmeteli 77 7,274 if we have two non-interacting particles of mass M in a one-dimensional harmonic oscillator potential of frequency ω,... Jul27-14 01:04 PM Jilang 27 642 The definition I have for a 2-point correlator is \langle \phi_1(x_1)\phi_2(x_2)\rangle = \frac{1}{Z} \int \mathcal... Jul27-14 12:58 AM MathematicalPhysicist 24 1,099 I can tell this is simple, but I'm just not seeing it: (pages 146-147) Radial equation = d^{2}u/dp^{2} = _{0}/p +... Jul26-14 09:32 PM strangerep 4 317 I am new here and was wondering what Schrodinger's Cat is and why it matters. Jul26-14 09:15 PM Nugatory 1 302 I had a course of computational physics in university. When the professor wanted to non-dimensiolize the Schrodinger... Jul26-14 03:36 PM Jazzdude 3 338 Hello Forum, The electromagnetic field EM must be treated relativistically because it travels at the speed of light... Jul26-14 10:16 AM tom.stoer 3 355 Hey Everyone, Just wondering what would be a good experimental investigation involving a radioactive source and the... Jul26-14 01:36 AM Nico123 3 389 Hi all, I'm trying to compute the effect that a magnetic field has on the singlet and triplet states of positronium. ... Jul25-14 11:24 PM "pi"mp 2 312 I have never been to the pyramids in Egypt. I'd love to go one day. I am sure their configuration will be just as... Jul25-14 09:17 PM bhobba 13 693 Forgive me if some of my question sounds misguided or misinformed - I'm new to the flux pinning game. I want to be... Jul25-14 08:58 PM jtmarmon 0 293 Dirac left me in the dust at this step. Can someone please help me through it. I understand from Susskind's... Jul25-14 08:43 PM marcusl 5 389 Hi, I'm entering graduate school this fall and was looking to improve my computational physics knowledge. I have... Jul25-14 08:00 PM bhobba 1 285 Hey there Im preparing for an oral exam in mathematical quantum physics. not sure if this fits in here very... Jul25-14 03:44 AM vanhees71 1 330 I've got a problem which is asking for the eigenvalues and eigenstates of the Hamiltonian H_0=-B_0(a_1... Jul25-14 12:20 AM Shyan 4 401 Just a simple question. How do we know the detector isn't messing up the double slit experiment when a single photon... Jul24-14 10:13 PM atyy 70 2,312 So I've been self-studying from Griffiths Intro to QM to get back in shape for graduate school this fall, and I guess... Jul24-14 09:25 PM strangerep 1 340 On page 86 of The Principles of Quantum Mechanics, Dirac left me in his dust. I quote: ... Jul24-14 06:03 PM Fredrik 2 360 Does modern physics allow for the existence of massless fermions? Jul24-14 12:43 PM atyy 2 343 What exactly is all this 'matrix elements of vectors' stuff that Landau is talking about? I don't mean to ask... Jul24-14 09:10 AM atyy 1 305 Hello Everyone, I am currently reading about when the Quantum Mechanical Theory becomes relevant. A term that... Jul24-14 07:29 AM Bashyboy 4 435 I have a few problems understanding the double slit experience and the behavior of photos due to simple observation. ... Jul23-14 11:31 PM bhobba 15 506 I am learning identical particles recently, but I have some problem interpreting what I am writing down. So if we have... Jul23-14 04:26 PM Jano L. 5 677 The first postulate of quantum mechanics says that every physical system is associated with a separable complex... Jul23-14 08:27 AM vanhees71 6 674 what is the INNER QUANTUM number ? Jul23-14 08:07 AM bahamagreen 6 538 Hi all! I am wondering if there is an interpretation of QM where the future is "set in stone" (for lack of a better... Jul22-14 11:46 PM bhobba 47 3,037 How do we know/observe a particle annihilating a anti-particle? Is it impossible to theorize that in the early... Jul22-14 02:55 PM phinds 4 599 I thought that it would be possible to get a single photon to a double slit which would be sufficiently coherent to... Jul22-14 10:28 AM naima 11 656

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