Simons Lecture: Charles Bennett (3)

This year's Wolf Prize recipient in Physics, Charles Bennett (IBM), will deliver a series of three introductory lectures on quantum information theory:

Occam's Razor, Boltzmann's Brain, and Wigner's Friend
Toward a mathematical home for our classical phenomenome

To be fully successful, a cosmology ought not only to explain available astronomical data, but should also provide a mathematical model of universe within which the body of phenomena we observe, our "phenomenome", is typical of those the theory predicts we should observe.  Unfortunately many otherwise reasonable cosmological models, including the standard LCDM model, suffer from a "Boltzmann brain" problem, i.e. they predict that we, along with all our scientific observations, are far more likely to be illusory fluctuations in an old dead universe than hard-working inhabitants of a live young one.  To escape this dilemma may require sacrificing reversibility of dynamics,  locality of interaction, or finding a non-arbitrary way of embedding of irreversible dynamics within a larger reversible structure.