Recent content by metamathphys

Hi Deldeal thanks for your reply. I am almost sure the system is setup correctly. I do not need an exact solution but an approximate one i.e. the first few terms in a power series method. Best

Hello everybody. Solving a problem in Physics I run into a system of equations that I do not know how to solve, I would appreciate some help. Here is the system: \ddot{x}+4\dot{x}^2=C_1e^{y} \dot{y}^2=C_2\ddot{x} The dependent variables are x,y. C_1 and C_2 are some constants. I try...

An isolated proton can not decay since is the lightest particle with baryon number equals to one. A proton in the presence of other stuff like other protons or neutrons so for instance a proton that is making up the nuclei of some atom may ''borrow" energy from this environment and then it can...

First of all I wish to thank you all for taking some time looking at my post. My first comment concerns all of those who suggest taking another time derivative. I do not agree with your results if I take another derivative what I get is...

Hello I am trying to solve this ODE dx/dt=(f(x)+g(t))^(1/2) I have been recalling what I learn in my ODE course and looking at my old textbook but I did not find what method is appropiate to try...any suggestions? Thank you very much!

Hello JorisL! I am in a similar situation to yours, I think that if your QFT and String Theory is good (maybe I should say better than an average student) then chapter 13 of Kiritsis book "String Theory in a Nutshell" is a good place to look at. I feel OK with QFT but not with String Theory so I...

Thank you very much. I already knew about Zee's but is too short I will give now a try to Manohar.

Hello. Apparently for SU(N) gauge theories there is a perturvative approach call "large N expansion". I need a working knowledge of this method but I can not find it in any textbook only in research papers that are rather for the expert. Someone has any suggestion where should I get started...