Recent content by tamiry

Homework Statement Hi i've noticed that, J^{ab}P^c + J^{bc}P^a+J^{ca}P^b = 0 [ Since J^{ab}P^c + J^{bc}P^a+J^{ca}P^b = x^a\partial^b\partial^c -x^b\partial^a\partial^c + x^b\partial^c\partial^a-x^c\partial^b\partial^a+x^c\partial^a\partial^b-x^a\partial^c\partial^b = 0 ] Next, I tried it on...

I looked at it again. At my second method. I had to change the integral limits as well, and that fixes it.

Something i ran into while doing hw Homework Statement starting with \int{dx} e^{-ikx}\delta(x) = 1 we conclude by Fourier theory that \int{dk} e^{+ikx} = \delta(x) Now, i try to compute \int{dk} e^{-ikx} (I've dropped the normalization factors of 2\pi. I believe no harm is done by...

You can use MATLAB to draw the blocks and springs, if that's what you're after. Draw the blocks in the correct locations, than add each spring. If you have fully licensed matlab, you can even save it as an AVI.

but of course... thanks!

Homework Statement Hi we have Lorentz operators J^{\mu\nu} = i(x^{\mu}\partial^{\nu} - x^{\nu}\partial^{\mu}) and these have [J^{\mu\nu}, J^{\rho\sigma}] = i(\eta^{\nu\rho}J^{\mu\sigma} + \eta^{\mu\sigma}J^{\nu\rho} - \eta^{\mu\rho}J^{\nu\sigma} - \eta^{\nu\sigma}J^{\mu\rho}) Now define...

hi, the delta symbol as a tensor (in the minkovski space, in case one has to be specific), what is it exactly? is it \delta^a_b = \frac{\partial{x^a}}{\partial{x^b}} is it \delta^a_b = g^{ac} g_{cb}or is there some other definition?thanks

hi, i'm trying to see how does an HO, traveling with constant speed v looks like. suppose a unitless system H = P^2+(X-vt)^2 define Y = X-vt then H = P^2+Y^2 i can see that [P,Y] = -i (unitless - no h-bar) so i guess it means that P and Y are conjugate space/momentum operators...