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There are fundamental reasons as to why there should exist a reformulation ofquantum mechanics which does not refer to a classical spacetime manifold. Itfollows as a consequence that quantum mechanics as we know it is a limitingcase of a more general nonlinear quantum theory, with the nonlinearity becomingsignificant at the Planck mass/energy scale. This nonlinearity is responsiblefor a dynamically induced collapse of the wave-function, during a quantummeasurement, and it hence falsifies the many-worlds interpretation of quantummechanics. We illustrate this conclusion using a mathematical model based on ageneralized Doebner-Goldin equation. The non-Hermitian part of the Hamiltonianin this norm-preserving, nonlinear, Schrodinger equation dominates during aquantum measurement, and leads to a breakdown of linear superposition.

The inevitable nonlinearity of quantum gravity falsifies the many-worlds interpretation of quantum mechanics