# 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: 119,261 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 35,385 Just something I was wondering about Schrödenger's cat. According to Schrödenger's cat, wether the cat is alive or... Jun13-12 07:07 PM fissile_mop 6 1,335 What is "Magnetic flux quanta"? is there any animation describing this subject? Jun13-12 01:03 PM mnada 2 720 The wavefunction is defined on the domain of complex numbers. To find the probability of discovering a particle in a... Jun13-12 10:23 AM Demystifier 1 445 I'm definitely messing up somewhere :P The Larmor Equation is \Delta H = \frac{2\mu}{\hbar Mc^2 e}... Jun13-12 10:07 AM Meselwulf 2 532 Hi folks, I've been reading into the concepts of chirality & helicity and often I find a statement that chirality... Jun13-12 08:38 AM Eruvaer 4 1,025 How was Pauli exclusion principle derived ? Experimental ? From some other physical formula ? Which ? From some... Jun13-12 04:13 AM Simon Bridge 1 842 i know you can use dE/dp = p/m = dw/dk but what happens when you throw a potential so you have E = p^2/2m + V,... Jun12-12 09:57 PM silence11 0 537 can a particle/photon be quantum entangled on more than one property/factor? (at the same time-- redundant... Jun12-12 09:39 PM lugita15 5 766 I don't know much about brackets and Hamiltonians, but there is a much simpler aspect of the time / energy uncertainty... Jun12-12 01:46 PM professorscot 0 561 ΔxΔp ≥ \frac{h}{4\pi} Since Δx=ct for a photon and Δp=(mv_{f}-mv_{i}) Then ct(mv_{f}-mv_{i}) ≥ \frac{h}{4\pi} ... Jun12-12 12:59 PM professorscot 8 1,331 I know MRIs. It seems that cell phone towers use superconductivity. What are some others? Jun12-12 11:49 AM Duplex 32 11,969 I know in classical physics we calculate the energy based on the Amplitude. I also know we calculate the energy in QM... Jun12-12 09:20 AM haael 3 1,369 we know as per uncertainity, (px-xp)>=h/4(pie)...ie can px-xp take any value which is more than h/(4(pie))..can it be... Jun12-12 08:58 AM haael 9 915 Hello there, I have to do an essay for my university class, and want to use virtual particles (or virtual... Jun12-12 06:07 AM tiny-tim 1 649 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 1,283 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 3 877 Jun10-12 08:06 PM robertjford80 0 771 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 1,135 Two spherically symmetric potentials, the Coulomb potential and the isotropic harmonic oscillator potential, lead to... Jun10-12 04:58 AM A. Neumaier 17 2,747 I have read that when 2 Hydrogen atoms come together their individual spacial wavefunctions overlap in the following... Jun10-12 03:44 AM cgk 1 991 how does/would LHV (local hidden variables) theory explain the phenomena of: 1. quantum entanglement swapping... Jun10-12 01:10 AM San K 3 1,054 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 3 963 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 1,000 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 1 852 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 1 745 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 1,276 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 3 709 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 3 740 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 1,016 Hi, Have there been done variations of double slit experiment, particularly I'm interested in following scenarios:... Jun8-12 01:05 PM Simon Bridge 3 820 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 6,602 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 1,162 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 1,095 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 2,151 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 5 874 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 1,838 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 1,251 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 1,042 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 4 726