Mechanics in six-dimensional spacetime

The peculiarities of mechanical motion in Minkovski space with three-dimensional time are considered. A variation principle for deriving equations of motion is defined and the vector nature of energy and conservation laws for six-dimensional energy-momentum vector are discussed. Difficulties connected with vacuum instability and the possibility of anomalous nuclear reactions are removed due to the time irreversibility principle. The motion of a charged particle in a constant electric field is studied as an example of multitime processes. Some results concerning planet motion in the multitime gravitational field are presented.