Threads Tagged with commutator Thread / Thread Starter Last Post Replies Views In infinitely potential well problem ##V(x)## is zero inside the box and ##\infty## outside the box. Is it possible to... Mar6-14 03:40 AM vanhees71 35 686 Quantum Physics 1. The problem statement, all variables and given/known data |phi (n)> being eigen states of hermitian operator H ( H... Mar1-14 05:05 PM vela 5 234 Advanced Physics Homework If we have two fermion operators with a known anti-commutator AB+BA, what do we do if we find ourselves with AB-BA in... Feb2-14 12:49 AM pellman 2 227 Quantum Physics Hi I regard, $$=0$$ but \Psi is a field-operator. I don't understand why the commutation of the derrivative of... Feb1-14 07:00 PM WannabeNewton 3 285 Quantum Physics Hey, in my notes I have calculated the Eigenenergie of the Hamiltonian: H= \hbar \omega (n+\frac{1}{2}) \cdot ... Jan28-14 05:13 PM Cthugha 4 333 Quantum Physics Hello, I regard field-operators, whereby \Psi is a fermionic-annihilation-operator and \vec{A(\vec{r})} is an... Jan17-14 06:47 PM Avodyne 2 262 Quantum Physics I'm doing something horribly wrong in something that should be very easy. I want to show that: = 0 So: = x... Jan16-14 02:31 AM strangerep 3 129 Advanced Physics Homework How do I compute the commutator , knowing that =-Ea? I tried by Taylor expanding the exponential, but I get -iEta... Jan5-14 03:40 PM mfb 7 489 Linear & Abstract Algebra 1. The problem statement, all variables and given/known data I have problem where I need to commutate my hamiltonian... Jan3-14 10:45 AM vanhees71 3 222 Advanced Physics Homework 1. The problem statement, all variables and given/known data This is more about checking a solution I've been given... Dec20-13 11:48 PM Dick 3 337 Calculus & Beyond Homework I know that the commutator of the position and momentum operators is ihbar. Can any other combination of two different... Nov20-13 02:00 PM lonewolf219 2 374 Quantum Physics 1. The problem statement, all variables and given/known data There are 3 tasks. 1) No other information is given.... Nov19-13 07:43 PM Catria 1 446 Advanced Physics Homework 1. The problem statement, all variables and given/known data Hello! I'm having troubles with this proof. given two... Nov15-13 05:04 PM Jreyes613 3 450 Advanced Physics Homework 1. The problem statement, all variables and given/known data For the SHO, find these commutators to their simplest... Oct15-13 11:31 AM Hakkinen 1 291 Advanced Physics Homework Consider the following commutator for the product of the creation/annihilation operators; = (2m(h/2∏)ω)^1 =... Oct10-13 09:13 PM lukka 2 584 Quantum Physics Two hermitian commutator anticommute: {A,B}=AB+BA=0.Is it possible to have a simultaneous eigenket of A and... Oct5-13 03:47 PM Jazzdude 1 305 Quantum Physics Hi. I'm trying to understand a derivation of the Bianchi idenity which starts from the torsion tensor in a torsion... Sep9-13 11:23 AM WannabeNewton 3 929 Differential Geometry The commutator of two operators A and B, which measures the degree of incompatibility between A and B, is AB - BA (at... Aug21-13 08:59 AM DeIdeal 12 503 Quantum Physics Hello, i try to prove that ∂μFμ\nu + igμ, Fμ\nu] = μ,Fμ\nu] with the Dμ = ∂μ + igAμ but i have a problem with... Jul30-13 08:15 AM oliveriandrea 2 271 Calculus & Beyond Homework I think most of them are replaced by brushless types or Induction Motor with VFD (variable frequency drive). Is there... Jul12-13 09:59 AM Windadct 12 601 Electrical Engineering 1. The problem statement, all variables and given/known data 2 total, Sz ∅1] 2. Relevant equations S2 total... May20-13 01:22 AM rsaad 0 540 Advanced Physics Homework I am new to group theory, and read about a "universal property of abelianization" as follows: let G be a group and... May1-13 07:48 AM dumbQuestion 2 483 Linear & Abstract Algebra 1. The problem statement, all variables and given/known data So we know that for two operators \hat{A} and \hat{B}... Apr26-13 01:22 PM FatPhysicsBoy 16 776 Calculus & Beyond Homework 1) Find the commutator subgroup of the Frobenius group of order 20. 2) I have the Cayley table. 3) What is the... Apr22-13 04:36 AM tiny-tim 1 243 Calculus & Beyond Homework 1. The problem statement, all variables and given/known data http://s13.postimg.org/mupmgjm3b/image.jpg 2.... Apr18-13 07:08 AM micromass 3 359 Advanced Physics Homework 1. The problem statement, all variables and given/known data Evaluate given =ih 2. Relevant equations Px =... Apr15-13 03:36 PM sudipmaity 8 426 Advanced Physics Homework 1. The problem statement, all variables and given/known data 2. Relevant equations 3. The attempt at a... Apr14-13 02:50 PM sudipmaity 0 222 Advanced Physics Homework Greetings, I would like to find the commutator \left and prove that \left=\left=\left I infer from the cyclic... Apr9-13 06:35 AM Septim 11 977 Quantum Physics 1. The problem statement, all variables and given/known data Hello. I am supposed to find the commutator between... Mar13-13 03:19 AM Just Steve 4 347 Introductory Physics Homework For every operator ##A##, ##=0##. And if operators commute they have complete eigen- spectrum the same. But if I look... Mar6-13 11:11 AM Einj 4 468 Quantum Physics 1. The problem statement, all variables and given/known data Using (x,p) = i (where x and p are operators and the... Feb26-13 09:11 AM andrien 6 779 Advanced Physics Homework If ##\hat{n}=\hat{a}^+\hat{a}## is number operator and \hat{a}^+,\hat{a} are Bose operators. Is there then some... Jan15-13 06:29 PM strangerep 11 724 Quantum Physics What is the commutator \hat{A}\hat{B}, \hat{C}\hat{D}] equal to? How to distribute what's inside? Dec24-12 07:00 PM Fredrik 4 498 Quantum Physics 1. The problem statement, all variables and given/known data Analytic functions of operators (matrices) A are defined... Oct24-12 01:28 PM D H 5 1,087 Advanced Physics Homework 1. The problem statement, all variables and given/known data a, b are operators that commute with their commutator... Oct19-12 03:50 AM asantas93 3 1,224 Advanced Physics Homework 1. The problem statement, all variables and given/known data Prove that nB] =nAn-1 for integrer n , assume ]=0=] ... Oct15-12 12:34 AM gabbagabbahey 4 567 Advanced Physics Homework 1. For problem, see attached picture. 2. I know the basic commutation relation =AB-BA and if the two operators... Oct12-12 03:44 AM jkrivda 1 427 Advanced Physics Homework This isn't really a homework question, it came along in my studying of the chapter, but it is a homework "type"... Oct1-12 09:35 PM gabbagabbahey 5 879 Advanced Physics Homework 1. The problem statement, all variables and given/known data Prove the following for operators A and B. e^A B... Sep10-12 07:20 PM chill_factor 1 450 Calculus & Beyond Homework Hello friends! Im trying to get an geometric interpretation of QM and am now confused about the commutation relation... Sep9-12 02:53 PM Dickfore 2 922 Quantum Physics