A Noval Theory of Generalized Gravitational Field Based on A New Physical Field

Static charge produces an electric field around its space,materials with mass produce a gravity field around the space.Differential equations for these 2 fields are the same.The motion of charge creates a magnetic field,based on the similarities of the gravitational field and electric field,the motion of materials should produce a new physical field,that is a “mass flow field”.The relation between mass flow field and gravitational field is similar with that of an electric field and magnetic field.A time varying mass flow field induces a gravitational field.A time varying gravitational field induces a mass flow field.The differential equation group for these 2 fields is given,its type is similar with that of Maxwell's equation in electric field theory.Therefore a complete set of basic theory with clarified physical meanings is concerning the gravitational field and mass flow field.Starting from the aspects of equation group,a wave equation for the gravitational field is derived.Its wave speed is a light speed.It is coincident with the prediction on the gravitational wave in Einstein's equation of gravitational field.It is the gravitational field and mass flow field that the gravitational wave is produced by the induction each other.Under the condition without time varying,the equation group of gravitational field is deduced to Newton's law of universal gravitation.