Gravity as Quantum Entanglement Force
  We conjecture that the total quantum entanglement of matter and vacuum in the
universe tends to increase with time, like entropy, and that an effective force
is associated with this tendency. We also suggest that gravity and dark energy
are types of quantum entanglement forces, similar to Verlinde's entropic force,
and give holographic dark energy with an equation of state comparable to
current observational data. This connection between quantum entanglement and
gravity could give some new insights into the origins of gravity, dark energy,
and the arrow of time.
