  The theoretical framework established in arXiv:quant-ph/0404103 is extended
to deal with possible astrophysical manifestations of phenomena involving
reverse, as well as forward, causation in time. The basic idea is that
space-time comprises the direct sum of a number of quantized fields, including
a distinct physical vacuum for each space in the sum. It is presumed that these
fields all contribute to, and are influenced by, gravitation, but generally do
not interact electromagnetically, i.e., are mutually invisible. At least one
term in the sum is proposed to consist of matter+vacuum evolving backward in
time; the expectation values of energies, both of matter and vacuum, of this
subspace are by construction negative, with a corresponding change of sign in
classical gravitational and inertial masses.
