Here is a recent paper I wrote, "Global and local aspects of causality in quantum mechanics".
It contains my talk to the conference "The Time Machine Factory, [speakable, unspeakable] on Time Travel in Turin", (Turin, Italy, October 14-19, 2012). The conference was very well organized, and the list of participants was really impressive. The proceedings were recently published online at EPJ Web of Conferences. Here is the link to my paper, and to the arXiv version. Here is a link to the slides.
Kochen–Specker theorem, simplified by A. Peres, and arranged by R. Penrose in a pattern inspired by M. C. Escher's Waterfall.Quantum mechanics forces us to reconsider certain aspects of classical causality. The 'central mystery' of quantum mechanics manifests in different ways, depending on the interpretation. This mystery can be formulated as the possibility of selecting part of the initial conditions of the Universe 'retroactively'. This talk aims to show that there is a global, timeless, 'bird's view' of the spacetime, which makes this mystery more reasonable. We will review some well-known quantum effects from the perspective of global consistency.