Abstract

I argue that quantum mechanics cannot usefully  be extended to a theory of the whole universe, so the task of quantum foundations is to discover that cosmological theory which reduces to quantum mechanics when restricted to small subsystems of the universe.  I argue that that cosmological theory will be based on a global notion of physical time which implies the distinction between past, present and future is real and objective.  These motivate two examples of novel formulations of quantum theory: the real ensemble formulation and the principle of precedence.  Each may imply departures from the expected quantum evolution for sufficiently large and complex quantum systems.