Distribution of Dark Matter around a Central Body, Pioneer Effect and Fifth Force

Abstract

Within the framework of the Projective Unified Field Theory the distribution of a dark matter gas around a central body is calculated. As a result the well-known formulas of the Newtonian gravitational interaction are altered. This dark matter effect leads to an additional radial force (towards the center) in the equation of motion of a test body, being used for the explanation of the so-called ``Pioneer effect'', measured in the solar system, but without a convincing theoretical basis up to now. Further the relationship of the occurring new force to the so-called ``fifth force'' is discussed.