Recent content by NeroKid

Hello everyone, I am going to do a paper that has something to do with wave propagation in a medium, but I am new in this area, so can you guy suggest any book or paper on introduction to the propagation of wave in fluid, my have a solid background in mathematics and mechanics , thank you very much

Im pretty sure that I was using Coulomb gauge not Weyl Gauge, what I meant was if other ##A_\mu## you have the transform in the interaction is UI-1 A##\mu## UI(the field in between is free field) but not for ##A_0## in the presence of photon and electron the author suddenly add the coulomb self...

I have been reading Franz Gross book, he define the time translation operator as U0 UI, with U0 stands for free particle time translation operator , so under this definition the field O transform as O = UIO0 UI-1 and under the coulomb gauge the the free field V =0, so V in present of...

what if I define the field as (identity fermion) x free photon + indentity photon x retarded fermion field since we can define the product of different space operator in lagrangian , can you tell me or point me to the literature what the formula has violated

Hello everyone, I have been wondering about the quantization of Maxwell's equation in free space, but now suppose that we have a source particle, fermion for example, now the field equation is a mixture of both fermion field and photon field so my question is whether you can get out of this by...

yeah but I want to look at EM field in a topological point of view rather than caculate it :D

Hey guys, I am wondering whether there is any book out there that approaches EM field using differential form and on the same or more advanced than Jackson, I have a solid knowledge of differential form and algebraic topology, thanks :D

tks for your recommendation

hello guys, I am wondering whether there's any book on classical mechanics on the level of Goldstein but using differential geometry language, no need for introducing to the differential geometry subject but mostly on how to analyse mechanics using it, tks

Hi ,does anyone know a good book in advanced EM radiation and it contains more information on velocity EM field , I have already finished Griffith's book

ok I see now tks a lot

maybe this will be clearer

yes but that is what after you change frome time derivative to hamiltonian , what i was trying to say is that because the time derivative is anti-hermitian it has the form < f|Ag> = - <Af|g> so any observable is conserved

the probability of finding particle is a constant with time <ψ|\partialψ/\partial(t)> = -<\partialψ/\partial(t)|ψ> , the equation holds for all ψ so the time derivative operator is an anti-hermitian operator, but then consider any hermitian operator A, the rate of change of A is d(<ψ|Aψ>)/dt =...

sina*sinb = -0.5[cos(a+b)+cos(a-b)] , then u have 2 solvable integrals