Time-Dependent Invariants for Dirac Equation and Newton-Wigner Position Operator

Details Time-Dependent Invariants for Dirac Equation and Newton-Wigner Position Operator Time-Dependent Invariants for Dirac Equation and Newton-Wigner Position Operator

1997-02-18

arxiv.org/abs/quant-ph/9702035v1

Physics

Quantum Physics

LATEX,21 pages,submitted to Physica Scripta

Scientific paper

10.1088/0031-8949/56/5/001

For Dirac equation, operator-invariants containing explicit time-dependence in parallel to known time-dependent invariants of nonrelativistic Schr\"odinger equation are introduced and discussed. As an example, a free Dirac particle is considered and new invariants are constructed for it. The integral of motion, which is initial Newton-Wigner position operator, is obtained explicitly for a free Dirac particle. For such particle with kick modeled by delta-function of time, the time-depending integral, which has physical meaning of initial momentum, is found.

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