An unified cosmological model driven by a scalar field nonminimally
  coupled to gravity
  This paper consider an universe dominated by baryonic matter, radiation and a
nonminimally coupled massive scalar field under the action of a symmetry
breaking potential. Inflation occurs naturally with appropriated slow-roll
values. The field evolves up to late times, when it is supposed to enter a
slowing varying phase, remaining at rest at the value $\phi_0$. A mechanism for
coupling the scalar field to baryonic and radiation energy densities through
the nonminimal coupling $\xi$ is presented, leading naturally to dark matter
and dark radiation components. A cosmological constant like term is also
present, acting as a dark energy at late times. All the density parameters are
in good agreement to observational data of Hubble measurements plus Supernovae
Type Ia data. All the desired phases of cosmic evolution appears naturally in
this simple model.
