Recent content by Fedecart

Well, actually in any quantum field theory the particles are represented by states in a fock space, and there is a different specie of particle for any infinitedimensional representation of the Poincarè group... In fact, Lorentz transformations do fix which kind of particles are allowed. If the...

Hi! I am looking for a review article on extended N=4 supersymmetry in 3=2+1 spacetime dimensions. (8 supercharges in total). I am familiar with the N=1, d=4 case, but now I need to study the N=4, d=3. Is anyone aware of the existence of such an introductory article, or a book in which this...

Hello everybody! Wanted to ask a couple of questions... 1) Which is the definition of a conformal field theory? 2) Which are the physical prerequisites one would need to start studying conformal field theories? (i.e Does one need to know supersymmetry? Does one need non-perturbative...

Thanks for the clarification. Do you think it is fine to email the department befor applying to ask if they let already master graduated students to skip already taken courses? I really don't want to waste 2 years re-studying things I have already done in europe

Hello! My name is Federico, a physics student from Italy who is thinking to apply to some universities in the USA for PhD program in theoretical particle physics. I have a couple of questions since I don't understend really well how the higher educational system works in the USA. I have...

There is a HUGE difference in the concept of homotopy and the concept of homeomorphism. You are right: ℝ^n has indeed the same homotopy type of ℝ^m, still they are not homeomorphic. Maybe this is the reason why you were confused at firsts. Furthermore, you are wrong when you say that (0,1) is...