  According to this principle (EEP), in order that the local physical laws
cannot change, after changes of velocity and potentials of a measuring system,
the relativistic changes of any particle and any stationary radiation (like
those used to measure it) must occur in identical proportion. Thus particles
and stationary radiations must have the same general physical properties. In
principle more exact and better defined physical laws for particles and their
gravitational (G) fields can be derived from properties of particle models made
up of radiation in stationary states after using fixed reference frames that
don't change in the same way as the objects. Effectively, the new laws derived
in this way do correspond with relativistic quantum mechanics and with all of
the G tests. The main difference with current gravity is the linearity fixed by
the EEP, i.e., the G field itself has not a real field energy to exchange with
the bodies and it is not a secondary source of field. G work liberates energy
confined in the models stationary states. The EEP also fixes a new
astrophysical context that has fundamental differences with the current ones.
This one has been presented in a separated work as a test for the EEP. The
whole theory,including the new universe context fixed by the EEP, was published
in a book.
