Because of equivalence of mass and energy Heim says there must also exist a field mass of the field energy of each field. However in case of gravitational field this results in a secondary (very weak) additional gravitative source because a field mass possesses its own gravitational field.
In a volume V0 there is mass which may be distributed in
any way. This mass produces a gravitational effect, as it can be
described with Newton's approximation (yellow level). Now Heim says
that to the energy of this gravitational field corresponds its own field
mass (blue level). This field mass in turn produces a second additional
gravitational field which is very weak (top level).
Again this field has its own field mass which produces a field. The result is
an infinite series, but one that converges
very quickly to a calculable limit value.
The whole description leads to a short mathematical description for
a corrected law of gravitation, which corresponds to
Newton's law of gravitation within the observable area of space.
However for very large distances it will provide very different
results. As you can see in the figure below, at very large
distances gravity will produce a weak repulsive force,
wich only exists when a mass is moving towards the centre of the
gravitational field. Among other things the phenomenon of the cosmic redshift can
now be explained as a gravitational effect.
The field process and some consequences of the corrected gravitation law are described at the next page.