Investigation on Vacuum Field Theory
  The investigations of the author on a new independent theory of field, termed a vacuum field theory (VFT), have been presented in four publications. It has been based on the axioms for inactivated and activated state of vacuum. An inertial frame connects with vacuum in a limited space. On the basis of the first axiom and the proven simultaneousness of events in two movable relative to each other inertial frames and, a new transformation of coordinates, time and relative speeds of frames has been produced, as well a new law of speed summation. The covariance of Maxwell equations with respect to the transformation mentioned has been proven. These theoretical results have been applied in kinematics, dynamics and electrodynamics and identity of the relevant experimental investigations has been turned out. In Newton space the laws of gravitation have been established on the basis of the second axiom, as well kinematics and dynamics of VFT. The laws mentioned have been used successfully with examining the gravitational phenomena in the Solar system and a new phenomenon has been found out, namely the change of the orbit of a material point with time from close to elliptical into circular. 
Georgy Kostadinov Gemedjiev