  The van Dam-Veltman-Zakharov (vDVZ) mass discontinuity problem can be solved
in the frame of the linear approximation of the Poincare-covariant second rank
symmetric tensor field gravitation theory. Conservation of the source
energy-momentum tensor, together with gauge invariance of the field equations,
lead to generation of two intrinsic irreducible non-ghost dynamical fields:
4-traceless symmetric tensor (spin-2 universal attraction) and 4-trace (spin-0
universal repulsion). Due to difference in the signs of these forces the total
free field Lagrangian contains different signs for the tensor and scalar
dynamical fields. Generalized Fierz-Pauli mass term in total spin-2 plus spin-0
Lagrangian gives natural massless limit for mg --> 0, so the mass discontinuity
paradox is absent. The Newtonian gravity and relativistic gravity effects,
including positive localizable energy density of both parts of the
gravitational field, are derived. Experimental test of the reality of the
dynamical spin-0 repulsive field can be performed by LIGO-Virgo gravitational
wave observations.
