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"In 1967 Sakharov published a very interesting article titled "...
Vacuum Quantum Fluctuations in Curved Space and the Theory of
Gravitation." In order to understand its meaning , it is
important to recall that , according to Einstein , gravity is the
curvature of space caused by the presence of matter; that is by
the presence of real particles and fields ( which have some
energy density) The curvature is proportional to the energy
density , and the proportionality coefficient is Newton's
gravitational constant G, divided by the velocity of light raised
to the fourth power. Curvature ~ G/c^4 X energy density This
is the famous Einstein equation. In his work , Sakharov asserted
that this equation has a dynamic interpretation: that the
curvature multiplied by c^4/G is the change in the energy density
of the vacuum due to the curvature of space.
Bob Zannelli