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A theoretical physicist who, with Giancarlo Ghirardi and Tullio Weber, proposed a common dynamical description of microscopic systems and macroscopic objects. Their Ghirardi-Rimini-Weber theory modifies ordinary quantum evolution so that widely separated macroscopic alternatives do not persist indefinitely. The GRW amplification mechanism connects a weak microscopic modification to strong macroscopic localization.^[ref]

A theoretical physicist who coauthored Ghirardi-Rimini-Weber theory, a proposed solution to the measurement problem based on modified dynamics. The 1986 model treats localization as a physical process, with a GRW amplification mechanism that makes its consequences depend strongly on system size.^[ref]

His review with Angelo Bassi explains how such models aim to obtain definite macroscopic outcomes from the same law used for microscopic objects.^[ref]

A theoretical physicist whose collaborative work compares Bohmian mechanics with Ghirardi-Rimini-Weber theory. Their common organizing idea is a primitive ontology: an account of matter in ordinary space, alongside the law governing its evolution. This clarifies how different proposals address the measurement problem even when both use a wave function.^[ref]

A theoretical physicist working on precise formulations of the measurement problem. His joint work compares Bohmian mechanics, in which particles have positions guided by a wave function, with Ghirardi-Rimini-Weber theory, in which localization events modify the dynamics. The comparison distinguishes an equation for the wave function from an account of what occupies physical space, such as the GRW flash ontology.^[ref]

A theoretical physicist working on foundations of quantum mechanics. In joint research on Bohmian mechanics and Ghirardi-Rimini-Weber theory, he examines how microscopic laws describe definite macroscopic outcomes. The analysis distinguishes particle trajectories, a continuous matter density and discrete spacetime events as different ways to specify the theory's primitive ontology.^[ref]

A theoretical physicist who coauthored the original Ghirardi-Rimini-Weber theory in 1986. The proposal gives microscopic and macroscopic systems a common modified quantum dynamics: localization is rare for an isolated microscopic constituent but becomes effective for a large object. It supplies a dynamical approach to the measurement problem.^[ref]