The Determinacy Problem in Quantum Mechanics.

Of the many ways of getting at the core of the weirdnesses in quantum mechanics, there's one which traces back to Schrödinger's seminal 1935 paper, and has to do with the apparent nature of the reality described by the formalism through the wavefunction . This issue, which I will be calling the , is distinct from the standard measurement problem of quantum mechanics, despite Schrödinger himself ends up conflating the two. I will argue that the is an exquisitely philosophical problem, for as it is standard when facing any phenomenon which appears to have indeterminate or fuzzy characteristics, the solutions available are to either blame the deficiencies of our language, or our lack of knowledge, or to blame the world itself.

Non-accessible mass and the ontology of GRW.

The Mass Density approach to GRW (GRW for short) has been widely discussed in the quantum foundations literature. A crucial feature of GRW is the introduction of a Criterion of Accessibility for mass, which allows to explain the determinacy of experimental outcomes thus also addressing the tails problem of GRW. However, the Criterion of Accessibility leaves the ontological meaning of the non-accessible portion of mass utterly unexplained.