# 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: 4,654 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 36,734 I visited this web site; http://www.electrodynamics-of-special-relativity.com that suggests that there is no... May16-06 06:10 AM dextercioby 1 1,257 I was taught that a particle is assigned to a unique quantum state. As a specific example, two bound electrons can't... Nov9-12 07:26 AM andrien 9 1,367 I was just wondering that thought we ( I mean scientists :tongue2: ) are working to try to find a way out of... Jun5-09 08:41 AM Naty1 2 1,624 I'm taking up QFT for the first time. Basic question really. Given the free complex Klein-Gordon field \phi under the... Sep8-06 07:35 AM selfAdjoint 7 1,319 Hello, i want to know if there is any way we can describe the way our brain transfers information using Quantum... Nov3-11 08:40 AM abbeynewton 10 2,335 i have read and studyed that 1/ boson are identical particles having zero or integral spin and can not be... Apr16-08 11:30 AM lbrits 3 10,409 can you tell me " is there any physical significance of the phase velocity? like we know that the group velocity is... Jun20-08 12:31 PM abdullahbameh 0 1,144 Is the charge density ρ(r) of a molecule concave or convex at points (r) in the molecule's space? Apr4-13 10:47 AM AbdulQat 0 322 hi this is abhimanyu. i m a new comer in the world of quantum physics. pls tell me what is wave packet? Dec31-08 01:44 PM tim_lou 3 3,215 Is quantization a consequence of the wave nature of particles? Elucidate. Sep3-14 09:58 PM bhobba 8 264 Do electrons really exist as standing waves in an atom? If so, are these standing waves what are known as atomic... Sep3-14 01:51 PM vanhees71 6 305 What is the definition of energy for quantum systems with time dependent Hamiltonians? Is it the eigenvalue of the... Jan28-12 12:39 PM xepma 4 1,825 what is the difference between strong force and residual strong force ?what is its range? Jun23-13 12:02 PM mfb 1 671 In general I could understand the meaning of spin.But in quantum level it is getting more complicated that I couldn't... Jul20-13 01:46 PM Couchyam 2 501 Does all types of quantum particles exist all time? If so where are charm and strange, top and bottom quarks located... Nov8-13 06:14 AM Demystifier 1 459 So if light acts like waves when interacting with huge objects and acts like regular particles when interacting with... Apr8-12 01:51 PM vanhees71 2 842 Hi guys, is there a reason why the energy of the harmonic oscillator is always written as:$$E_{n} = \hbar \omega... Apr19-13 02:38 PM dextercioby 1 493 Hi guys, I consider fermionic holes and I know the creation and annihilation operators of them. I have shown that... Jan3-14 12:50 PM Abigale 2 419 Hey, I consider a diagonalized Hamiltonian: H=\sum\limits_{k} \underbrace{ (\epsilon_{k} u_{k}^2 -\epsilon_{k}... Jan8-14 09:20 AM DrDu 1 505 Hello, I regard field-operators, whereby \Psi is a fermionic-annihilation-operator and \vec{A(\vec{r})} is an... Jan17-14 05:47 PM Avodyne 2 368 Hello, I am thinking for some hours about the commutation of the field-Operator/(annihilation-Operator): \Psi and... Jan18-14 11:30 PM Avodyne 3 521 Hey, in my notes I have calculated the Eigenenergie of the Hamiltonian: H= \hbar \omega (n+\frac{1}{2}) \cdot ... Jan28-14 04:13 PM Cthugha 4 434 In my note, we have written the field strength tensor as: F^{\mu\nu} =\partial ^\mu A^\nu -\partial ^\nu A^\mu... Jan28-14 07:10 PM ChrisVer 5 397 Hi I regard,$$=0$$but \Psi is a field-operator. I don't understand why the commutation of the derrivative of... Feb1-14 06:00 PM WannabeNewton 3 397 Hey Guys, I regard two operators \Psi , \Phi , that don't commute. Does the product-rule, looks like that? ... Feb6-14 05:34 AM Bill_K 2 298 Hey guys, I regard a relativistic vector:$$ k^\mu =(k^0,k^1,k^2,k^3,)=(\frac{\omega_k}{c}, \vec{k} )  ... Feb8-14 02:24 PM Meir Achuz 2 329 Hi all. Here is an n-particle hamltonian. H=\int... Jun25-11 10:30 PM strangerep 9 1,091 Hi everyone, I have a question concerning the double slit experiment that I would like clarified. According to a... Sep28-09 08:05 PM abomination5 1 624 Hi Iam having a little problem understaning why some atoms are configured in a certain way. I know that each... Apr3-10 10:03 PM abotiz 3 1,070 Hi, There is this one thing that bugs me about photoelectric effect, everywhere I read it says usually the K-shell... Aug31-13 12:03 PM abotiz 10 1,378 Hi, Iam having trouble understanding (or actually picturing) things I have learned, now that I look back at it. ... Aug29-13 03:22 PM Nugatory 4 596 Suppose, i want to diagonalize operator A by matrix S (A'= S^\\dagger A S). Do i need to form S from "NORMALIZED"... Sep20-10 10:50 PM Parlyne 1 813 Hi, I'm doing research to chipproduction, and I can't seem to figure out how transistors really work (in detail).... May4-05 11:08 AM abraxas 6 2,996 This question appeared in my exam . Q. A bullet of mass 41g travels at 960m/s. what wavelength can we associate... Mar20-11 03:06 AM abrowaqas 2 1,307 Hey guys! First time posting on this site. Been reading for quite a while and really loving it! :thumbs:! I'm a... Feb12-14 01:09 AM Khashishi 3 442 Hi guys. I'm trying to get the idea of probability density for 1s hydrogen atom. I just don't understand that... Feb22-14 10:51 AM jtbell 3 442 Hey guys. I'm struggling to picture ultraviolet catastrophe. The graph tells me that at certain temperature, intensity... Apr11-14 05:46 PM The_Duck 3 522 Hi, I am scratching the surface of information regarding particle physics. I have a basic understanding of standard... Aug9-12 03:01 PM JeremyEbert 19 4,509 I've been looking into the time independent schrodinger equation (E\Psi = Ĥ\Psi.) I know that \Psi is the wave... Jul9-12 07:10 PM nonequilibrium 1 798 Hi, ΔEΔt ≥\frac{h}{4\pi} How does this formula relate to particle creation? I understand that it is relevant to... Feb1-13 11:58 AM The_Duck 2 448