Discussion on a relativity momentum operator;

This article discusses in detail about the presentation of the momentum operator P under coordinate representation.

It is proved that the components of relativitic momentum operator in any coordinate,in-cluding the curve coordinate,is compoment operator of momentum,and it is impossible that there exist the term relative to spin matrix.

This paper begins with the commutation relation of abstract angular momentum operator, and then utilizes the corresponding raising operator and the lower operator to directly solve the eigenvalue and the same eigenvector of J2 and Jz.

Previous results related to the appropriate spin operator and the angular momentum operator for a relativistic particle with arbitrary spin and nonzero mass are discussed in an alternative way.

It is pointed out that the angular momentum operator J ^ does not have complete set of eigenvalues and eigenvectors,the dynamical quantity described by angular momentum operator J ^ is non observable,it is not appropriate to treate angular momentum J as a whole.

In this paper the initial coordinate operator and the initial momentum operator are taken separately as the complete set of dynamical variables for a two dimensional oscillator and the corresponding non stationary state wavefunctions of the two dimensional oscillator are derived.

In light of the new method the physical meaning is laid in much more clarity, and also the orresponding result for boost vector operator is just parallel.