Octonionic Electromagnetic and Gravitational Interactions and Dark Matter

Based on Maxwellian quaternionic electromagnetic theory, the electromagnetic interaction, gravitational interaction and their coupling influence with the dark matter field in octonionic space are discussed. The research results disclose the close relationships of dark matter field with electromagnetic and gravitational interactions. In the electromagnetic interaction, the variation of field energy density has direct effect on the force of charge and current. In the modified gravitational interaction, the near coplanarity, near circularity and corevolving of planetary orbits are deduced from the equations set. The change of centrifugal force of celestial body leads to fluctuation of revolution speed, when the field energy density, celestial body's angular momentum in its sense of revolution or its mass spatial distribution varied. In the dark matter field, the equations set reveal the movement properties of dark matter in certain conditions and its influence on ordinary matter movements. The research results explain that some observed abnormal phenomena about celestial bodies are caused by either modified gravitational interaction or dark matter.