The notions of cause and effect are fundamental in physics and other natural sciences, but they have been frequently challenged since the birth of quantum theory. Recent experimental tests with elementary quantum systems, most notably Bell tests, radically challenge the very notions of physical reality and cause-effect relations. The project aims to investigate the notion of causality both in quantum theory and beyond to understand, among other things, how an arrow of time may arise in the framework of indefinite-order theories.

Coordination: Yelena Guryanova, Austrian Academy of Sciences