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From the general assumption that gravity originates from the coupling andthermal equilibrium between matter and vacuum, after a derivation of Newton'slaw of gravitation and an interpretation of the attractive gravity forcebetween two classical objects, we consider the macroscopic quantum gravityeffect for particles whose wave packets are delocalized at macroscopic scale.We predict an abnormal repulsive gravity effect in this work. For a sphere fullof superfluid helium, it is shown that with a gravimeter placed in this sphere,the sensitivities of the gravity acceleration $\Delta g/g$ below $10^{-8}$could be used to test the abnormal quantum gravity effect, which satisfies thepresent experimental technique of atom interferometer, free-fall absolutegravimeters and superconducting gravimeters. We further propose aself-consistent field equation including the quantum effect of gravity. As anapplication of this field equation, we give a simple interpretation of theaccelerating universe due to dark energy. Based on the idea that the darkenergy originates from the quantum gravity effect of vacuum excitations due tothe coupling between matter and vacuum, without any fitting parameter, theratio between dark energy density and matter density (including dark matter) iscalculated as 2.2, which agrees quantitatively with the result 7/3 obtainedfrom various astronomical observations.

Abnormal Quantum Gravity Effect: Experimental Scheme with Superfluid Helium Sphere and Applications to Accelerating Universe