  When one takes into account gravitation, the measurement of space and time
cannot be carried out with infinite accuracy. When quantum mechanics is
reformulated taking into account this lack of accuracy, the resolution of the
measurement problem can be implemented via decoherence without the usual
pitfalls. The resulting theory has the same physical predictions of quantum
mechanics with a reduction postulate, but is radically different, with the
quantum states evolving unitarily in terms of the underlying variables.
Gravitation therefore makes this worrisome situation, potentially leading to
two completely different views of reality, irrelevant from an empirical point
of view. It may however be highly relevant from a philosophical point of view.
