Recent content by tun

Thanks for replying. I understand the example that you gave, but unfortunately mine is more complicated! My equation is: \ddot{\psi} + 4g_{2}\dot{\psi} + 4g_{1}\cos(t)\sin(\psi) = 0 I can write this as two first order equations for \psi_1 = \psi and \psi_2 = \dot{\psi}: \dot{\psi}_1 =...

Hi all, I am swiftly learning that past the undergraduate level we can't really solve anything explicitly, unless we are really lucky with the problem. In my research I have an ODE which is nonlinear and nonautonomous and is awkward to analyse. My question is this: given some information...

Right, I forgot the rescaling but was nearly there! It seems to me though that having the same Hamiltonian or close enough so that we can find fixed points corresponds to a rather special situation. I'll take a look at that book though, hopefully that will clear things up. Thanks for your...

I am currently trying to get my head round RG in the context of statistical mechanics and am not succeeding! I would be grateful for any help. I have a specific question, but any clarification of RG in general would be useful. Here is my understanding of the main ideas: 1. Define...

After a while reading physicsforums.com from the shadows, I have decided to emerge and ask a question or two. I was reading a review article on extended irreversible thermodynamics recently, but the EIT isn't relevant - it was something in the intro that caught my eye. "The variables used...