Comment on " the Free Will Theorem "

In a recent paper [7], Conway and Kochen claim to have established that theories of the GRW type, i.e., of spontaneous wave function collapse, cannot be made relativistic. On the other hand, relativistic GRW-type theories have already been presented, in my recent paper [16] and by Dowker and Henson [8]. Here, I elucidate why these are not excluded by the arguments of Conway and Kochen. PACS: 03.65.Ta. Key words: quantum theory without observers; Conway–Kochen " free will " theorem; Ghirardi–Rimini–Weber (GRW) theory of spontaneous wave function collapse; nonlocality. Physicists have often expressed the wish for a quantum theory without observers, i.e., a formulation of quantum theory that is not fundamentally about what observers will see if they carry out certain experiments, but instead about an objective reality. In such a theory, the quantum formalism gets derived (from the laws governing the objective reality) rather than postulated. One quantum theory without observers was presented by Ghirardi, Rimini, and Weber (hereafter, GRW) [11]. In its original version, it deals with non-relativistic quantum mechanics. In the GRW theory, the collapse of the wave function is an objective physical process; the rule for when and how the wave function collapses makes no reference to observers, but is expressed in a mathematical way as a stochastic process, thus describing a spontaneous collapse. That is why observers are not mentioned in the definition of the theory, but can be treated as just another agglomeration of electrons and quarks. The objective reality in the GRW theory consists of the wave function together with certain variables describing the distribution of matter in space-time, called the primitive ontology [1]. I will describe an example of primitive ontology later, the flash ontology.