Recent content by Questionasker

Thank you for your response! Can you show one example, in which ##t>0##?

Too familiar with Bose Hubbard model, but suddenly got stuck by a simple question: Why is the kinetic term (to be precise should be single body part) negative?

I am not sure about your question. But that translation operator is a generic operator, which translate a function value at x to x+a.

I am attending a condensed matter, BEC, superfluid related conference. I found though I work in this area but not continuously, I can hardly understand what people are talking about and what people are interested in. This let me feel that I am wasting my time in the conference room. The topics...

A charge moving in magnetic field will feel the Lorentz force and rotate. Now if you reverse the velocity at the end of such a process, the charge will not trace the way back so the time reversal symmetry is broken here. I'm just wondering is there another possibility for breaking the time...

Talking about charges. If someone claims that in his work time reversal symmetry is conserved, does that equal to say he/she is not imposing a magnetic field?