  A previous paper [1] introduced a quantum-mechanical theory of gravity, and
showed it agrees with the standard experimental tests of general relativity.
Doppler tracking signals returned by the Pioneer 10 and 11 space probes offer
an additional test. Analysis by Anderson, Laing, Lau, Liu, Neito and Turyshev
[2] finds a persistent blueshift, equivalent to an extra acceleration of the
probes toward the Sun. While unexplained by general relativity or prevailing
cosmology, it's shown this effect is predicted by the quantum-mechanical
alternative.
