  A gravity-induced approach to wavefunction collapse based on semiclassical
gravity is enhanced by the hypothesis of a temporally expanding spacetime,
which leads to a collapse model that can resolve the conflict between quantum
nonlocality and relativity. It is postulated that the spacetime region on which
the evolution of the state vector exists is bounded towards the future by a
border that is dynamically moving towards the future, and at which the state
vector must fulfil a boundary condition. Wavefunction collapse is represented
in such a way that the evolution of the state vector changes abruptly at
critical spacetime expansions to an evolution resembling a classical
trajectory. This can explain the correlations in EPR experiments without coming
into conflict with relativity, since the evolution of the state vector before
and after the abrupt change is governed solely by local physical laws. This
model leads to the same lifetimes of superpositions as the gravity-based
approaches of Diosi and Penrose, and is characterised by the facts that energy
is conserved at collapse and that the reduction point in time does not vary
statistically. Some unique features of the model are that it naturally leads to
stochastic behaviour and that it can predict reduction probabilities. It
explains why all experiments performed so far behave in agreement with Born's
rule, due to a property that they have in common. This gives rise to new
experiments for checking Born's rule, which can be realised in the short term.
