I also had problems finding out more. Unfortunately I don't have time to think much about this now...but I had a look in the "phonebook": Gravitation by MTW. At page 504 there is a discussion about the problems of defining the EM tensor. Its a bit short, but it is interesting... it turns out...
Hmm...it's been a while since I took GR... flipping through some books I see that General Relativity by Wald seems to have a nice discussion of this in appendix E. And so I will simply refer you to that :smile:
Let me however comment that
T^{\mu \nu} = -2 \frac{\delta L}{\delta g^{\mu \nu}}...
It is explained (briefly) at page 74 in Zee's QFT book. Very roughly you know that for a conserved current the integral over space= the charge Q, is proportional to the canonical momentum conjugate to the field. Combine this with [x,p]=i and you are there.
And so the conserved charges are the...
I'm not an expert, but I think it goes something like this: Before we go to the superspace formalism, we know how the R-symmetry acts on the fields. To realize this symmetry in superspace, we look at for example the chiral superfield. We know how the R-symmetry acts on the components fields, the...
Hi!
I am a bit confused about the AdS/CFT conjecture...
One of the things I don't really understand is when N=4 SYM is a valid
description of the D-brane dynamics. My impression was this:
In the open string picture of branes, the massless excitations of the open string connected to the...