  We study the mechanism by which the particle-antiparticle entangled state
collapses instantaneously at a distance. By making two key assumptions, we are
able to show not only that instantaneous collapse of a wave function at a
distance is possible but also that it is an invariant quantity under Lorentz
transformation and compatible with relativity. In addition, we will be able to
detect in which situation a many-body entangled system exhibits the maximum
collapse speed among its entangled particles. Finally we suggest that every
force in nature acts via entanglement.
