Recent content by Ace10

Right, thank you very much! :wink:

Wow Sam, thank you very much for your detailed reply! I realized I was treating the representations the wrong way! Thank you very much! By the way, just to ask, if we have an odd dimensional spacetime, say: g=diag{...-1... , ...+1...} (n-times -1 with n odd), then we use absolute value at...

Hi all, my question is rather a simple one and regards conformal transformations. On "Applied CFT" by P.Ginsparg, http://arxiv.org/pdf/hep-th/9108028.pdf , on page 10, gives the transformation rule of a quasi primary field and relates the exponent of 1.12 to the one of 1.10. My first question...

wow right. i'll be back with smth new..

No no, these 2 are new! They are not very clear though. Or am i totally wrong?

Thank you guys i found it! I think the two missing are the ones of the image, right?

I think I found all ten of them, i have drew them in the following image..

Thank you mfb, I'll try it in a few hours...hope to get a decent result!

Good afternoon, First of all thank you Chopin very much for your help, I'll try to make graphs with more photons exchanged tonight, it seems a bit strange as it could lead to two-loop corrections. I'll post here. Secondly, mfb you are right i must have done something wrong here, I have...

First of all thank you for your reply Chopin. Of course it is obvious that I've made a huge mistake with the loop number, these two graphs cannot contribute indeed. I've made another try which can be seen in the following image. Graph 1 is without corrections, graphs 2 and 4 are with simple...

Homework Statement First of all, Happy New Year! I have to solve the following exercise (xmas gift :P) and some things are a bit vague..Here is it: For the ee--->ee scattering process, draw all amputated and connected graphs that would contribute. The hint is that one should find 10 different...

Hello guys, I need some serious help for the solution of a problem in Q.M, I'm not so sure if I deal with it properly.. Consider an infinite potential well with the traits: V(x):∞, for x>a and x<-a...

Hello fellow physicists, during some calculations for a project regarding Renormalization, I had a difficulty in computing a derivative of a loop integral in Yukawa theory. The thing I'm reffering to can be found in Peskin and Schroeder's book, Introduction to QFT , in Chapter 10 page...

Thanks adrien,I have in mind the corresponding paragraph in Peskin and Schroeder's book but I'll check this out too, it's quite helpful.

I think its ok now..Good afternoon fellow scientists,i have a small problem in evaluating the propagator for the complex Klein-Gordon field. Although the procedure is the one followed for the computation of the propagator of the real K-G field, a problem comes up: As known: <0|Tφ + (x)φ(y) |0>...