Recent content by Traur

Consider a cubic box of size L. Then periodic boundary conditions imply that kx=nx*2pi/L where nx=0,1,2,3,... The same follows for ky and kz. Now you can see that in k-space a state with a given k occupies a k-space volume of (2pi/L)^3. Then the number of states per unit volume is (1/V) L^3 * 2...

In fact, if you assume that the phase velocity is the velocity of the particle you will see that the particle travels faster than the speed of light! On the other hand, the group velocity is always smaller than c. So if relativity is right, physical states must be a superposition of plane waves...

I'm interested in solving physical problems in high energy physics, but acquiring a greater understanding of the formalism would be great also!

Hi! I'm in a master course in theoretical physics and enjoying a lot to learn about Quantum Field Theory (QFT)! So I was thinking doing a PhD related do QFT. What are the best places to work on QFT? Thanks a lot!