  This paper has been withdrawn by the author after further work showed the
proposed theoretical approach cannot fit planetary perihelion precession data.
As presented, the theory doesn't fit gravitational light deflection by the sun
either, but a straightforward theoretical change does remedy that; however a
proper fit to planetary perihelion precession data is not thus obtained. The
author's stated philosophical objections to the Einstein equation can be dealt
with in a markedly different way -- a new paper entitled "Unique Einstein
Gravity from Feynman's Lorentz Condition" has been submitted. Einstein's
equivalence principle implies that the acceleration of a particle in a
"specified" gravitational field is independent of its mass. While this is
certainly true to great accuracy for bodies we observe in the Earth's
gravitational field, a hypothetical body of mass comparable to the Earth's
would perceptibly cause the Earth to fall toward it, which would feed back into
the strength as a function of time of the Earth's gravitational field affecting
that body. In short, Einstein's equivalence principle isn't exact, but is an
approximation that ignores recoil of the "specified" gravitational field, which
sheds light on why general relativity has no clearly delineated native
embodiment of conserved four-momentum. Einstein's 1905 relativity of course
doesn't have the inexactitudes he unwittingly built into GR, so it is natural
to explore a Lorentz-covariant gravitational theory patterned directly on
electromagnetism, wherein a system's zero-divergence overall stress-energy,
including all gravitational feedback contributions, is the source of its
gravitational tensor potential. Remarkably, that alone completely determines
Lorentz-covariant gravity's interaction with any conservative system of locally
interacting classical fields; no additional "principles" of any kind are
required. The highly intricate equation for the gravitational interaction
contribution to such a system's Lagrangian density is only amenable to solution
by successively refined approximation, however.
