摘要
The harmonic condition is applied to the motion of galaxies in relativistic cosmology. For the material universe we consider that the average distribution of matter on the large scale in the universe is homogenous and isotropic, but within each small region individual galaxies can have large or small masses. Each galaxy moves according to the laws of motion determined by the field equations of gravitation for the average distribution of matter in the whole universe. Transformations between the isotropic, the co-moving, theRobertson-Walker and the standard system of coordinates can be derived by using the harmonic condition.
The harmonic condition is applied to the motion of galaxies in relativistic cosmology. For the material universe we consider that the average distribution of matter on the large scale in the universe is homogenous and isotropic, but within each small region individual galaxies can have large or small masses. Each galaxy moves according to the laws of motion determined by the field equations of gravitation for the average distribution of matter in the whole universe. Transformations between the isotropic, the co-moving, theRobertson-Walker and the standard system of coordinates can be derived by using the harmonic condition.
