Recent content by Quantum child

You can find the paper at "arXiv:1002.0066 [quant-ph]" (subsection 3.1) Thank you Avodyne but that exactly is my query, the result that is appearing in the paper is the inverse of this.

First I want to thank you all for devoting some time to answer me. I had to be more comprehensive, so let me provide some more details. We take the Dirac Hamiltonian H=aP+mb in the non-manifestly-covariant formulation. According to this Hamiltonian the velocity of a free Dirac particle is...

Hi all, This is the problem I want to share with you. We have the hamiltonian H=aP+bm, which we are commuting with the position x and take: [x,H]=ia, (ħ=1) Ok. Now if we take, instead of x, the operator X=Π+ x Π+ +Π-xΠ- where Π± projects on states of positive or negative energy the...