  An extremely simple and unified base for physics comes out by starting all
over from a single postulate on the common nature of matter and stationary
forms of radiation quanta. Basic relativistic, gravitational (G) and quantum
mechanical properties of a standing wave particle model have been derived. This
has been done from just dual properties of radiation's and strictly homogeneous
relationships for nonlocal cases in G fields. This way reduces the number of
independent variables and puts into relief (and avoid) important inhomogeneity
errors of some G theories. It unifies and accounts for basic principles and
postulates physics. The results for gravity depend on linear radiation
properties but not on arbitrary field relations. They agree with the
conventional tests. However they have some fundamental differences with current
G theories. The particle model, at a difference of the conventional theories,
also fixes well-defined cosmological and astrophysical models that are
different from the rather conventional ones. They have been described and
tested with the astronomical observations. These tests have been resumed in a
separated work to be sent to the astro Archive.
