Recent content by alanzhu

Hi, I'm trying to work out the problems on peskin's book. Does anyone know that where I can find the solutions to them? It is really hard to do it all by myself. Thanks!

Hello everyone, I am now learning QFT, this theory is really abstract and daunting. I can't understand the concept of vector field. What is vector field at last? why there are four polarization vectors? I feel that the whole theory is somewhat lack of reasoning, the postulates and assumptions...

In page 23 of Landau's "Quantum Mechanis", he said:"The results of measurements in quantum mechanics cannot be reproduced."what's this means?

But I'm not in US, It's hard for me to contact with any of the professors.

I want to pursue for a Ph.D in these area.

Could this theory explain dark matter? I mean is it possible that there is no dark matter definitely.Because the gravitation constant is not a real constant , the prediction made by GR may be totally wrong.

Is it right?Is it the result of Mach's principle in GR?