Space travel by reduced effective mass after induced matter theory

Interstellar travel needs enormous amounts of energy to accelerate payload, structure and propellant to high speeds. For a journey to another distant sun lasting several decades all three of them have to be huge. The propellant needs more than 90\% of the whole start weight, even from an orbit around the Moon. Since all the energy is needed to increase kinetic energy and this energy depends on inertial mass, a reduction of the effective mass could save a lot of the energy to invest. As inertial mass and gravitational mass are the same following the equivalence principle of General Relativity and gravity depends on the gravitational constant too, a local variation of the gravitational constant might result in variation of the effective mass. In Kaluza-Klein Theory the gravitational constant is substituted by a scalar field leaving it no longer constant but making it variable. This scalar field is predicted to change under strong dynamic electromagnetic fields. The interaction between both is described by an equation in 4D derived from a 5D Ricci-flat metric. This metric consists of 15 different components: The 10 gravitational potentials $\boldsymbol{g$$_{\mu\nu}}$, the for components of the electromagnetic vector potential $\boldsymbol{A$$_{\mu}}$ and the adressed scalar field $\Phi$. In this paper we present the full 15 gravitational and electromagnetic potentials for a relativistic moving charged mass. The 15$^{th}$ component - the scalar field, taking the place of the gravitational constant - seems to follow the electromagnetic potentials and thus could seperate as saclar wave from the field sources as electromagnetic waves and also gravitational waves do. All 15 potentials of the 5D metric tensor have to fulfill the Ricci-flatness condition $\boldsymbol{R _{AB} = 0}$ . There is no extra explicit 5D energy-momentum-tensor. Matter is "induced" implicitly through curvature of the 5th dimension, which is permitted by omitting Kaluza's cylinder condition, allowing further new features like reduction of effective mass.