  We exhibit a purely quantum mechanical carrier of the imprints of gravitation
by identifying for a relativistic charge a property which (i) is independent of
its mass and (ii) expresses the Poincare invariance of spacetime in the absence
of gravitation.
  This carrier is a Klein-Gordon-equation-determined vector field given by the
``Planckian power'' and the ``r.m.s. thermal fluctuation'' spectra. The
imprints themselves are deviations away from this vector field.
