Recent content by WarDieS

As already said, that's an approximation since you are not using the whole series. A more precise result using Mathematica is 2.1773189849653067526. By the way, I made a typo, I meant \frac{1}{2}\sinh(2x) which solution is x=0

Thanks RGevo, I am aware that I have to take with care the polarization states, ghost term and so on, that's why i am asking for an example, doing this is tricky for me. I will take a look at those chapters you talk about. Thanks again

I am sorry there is a typo, the second one is q + \bar{q} \rightarrow g + g . Thanks for the paper, I will look it into detail, Its not what i had in mind but it appears it has some comments about how calculating.

Thanks for your response. I just want to calculate them. The Peskin and Schroeder book proposes problems with the second and third examples I wrote. I am aware of some of the things you said, but still I want to calculate them, I am asking for a detailed calculation already done or at least a...

\tanh(x) goes from zero to one, \cosh^2(x) blows up to infinity, the only solution is x=0. Also, \tanh(x)\cosh^2(x) = \frac{1}{2}\sinh(x) and x = \frac{1}{2}\cosh(x) has no solution

Unless the door is moving against the ball, the ball won't bounce with more velocity. Momentum is always conserved

If you want the numbers for which the equation holds, I think you may want (and have) to do it by plotting, or using some numeric method. It has infinite solutions, the first one has be zero since you have \tan(0)=0, some solutions are x = 3.36922, 6.3062, 9.4263, 12.5665, 15.708

I am trying to calculate differential cross-section for partonic collisions (QCD) like q + q \rightarrow q +q q + \bar{q}\rightarrow q + q g + g \rightarrow g + g I can't find those calculations done anywhere, just the results and maybe some middle tips, that's all. As you may know those...

Yes you are right andrien, i can't believe i didnt notice it myself, many thanks!, i was just considering it as a number for not clear reasons, thanks again.

Hello, Hi There I am trying to obtain the relations of the conserved charges of the stress tensor, it has 4, one is the hamiltonian and the other three are the momentum components. \vec{P}=-\int d^3y \sum_i{(-\pi_i(y) \nabla \phi_i(y))} And i have to prove the conmutators...

Homework Statement We start with a pure state at t=0 of an electron is C e^{- a^2 x^2} \left(\begin{array}{c} 1\\ i \end{array}\right) Probability density of measuring momentun p_0 and third component of spin - \frac{\hbar}{2} And probability of measuring a state with momentum...

work is energy

Seems to me you forgot a minus sing in ## \langle T \rangle ##

i am really grateful, thanks for your patience with me :D

You wrote ## \frac{1}{2}C V^2 ## without an equal sign, check in your notes what's that equal to. That equation relates C, V with something that may be interesting for you