Quantum Gravitational Force Between Polarizable Objects
  Since general relativity is a consistent low energy effective field theory,
it is possible to compute quantum corrections to classical forces. Here we
compute a quantum correction to the gravitational potential between a pair of
polarizable objects. We study two distant bodies and compute a quantum force
from their induced quadrupole moments due to two graviton exchange. The effect
is in close analogy to the Casimir-Polder and London-van der Waals forces
between a pair of atoms from their induced dipole moments due to two photon
exchange. The new effect is computed from the shift in vacuum energy of metric
fluctuations due to the polarizability of the objects. We compute the potential
energy at arbitrary distances compared to the wavelengths in the system,
including the far and near regimes. In the far distance, or retarded, regime,
the potential energy takes on a particularly simple form:
$V(r)=-3987\,\hbar\,c\,G^2\alpha_{1S}\,\alpha_{2S}/(4\,\pi\,r^{11})$, where
$\alpha_{1S},\,\alpha_{2S}$ are the static gravitational quadrupole
polarizabilities of each object. We provide estimates of this effect.
