  I derive the basic relativistic corrections to the equations of motion of
test particles and light rays in the field of a source with active mass $m$,
including the phantom mass density that any such source generates when a
modification of Newton's action at a distance includes a long range term. The
technical framework of this paper is that of Einstein's theory of gravitation
at the linear approximation with respect to the mass parameter $m$.

General Relativity and Quantum Cosmology