Statistical system with a fantom scalar interaction in the Gravitation   Theory. I. The Microscopic Dynamics
  Based on the proposed earlier by the Author approach to macroscopic description of scalar interaction, this paper develops the macroscopic model of relativistic plasma with a fantom scalar interaction of elementary particles. In the given model as opposed to previous models a restriction on nonnegativeness of the particles' effective mass is removed. 
Yu.G. Ignatyev and D.Yu. Ignatyev
gr-qc