FFP10 Day 1
Professor 't Hooft began the proceedings with his lecture on Gravity and the Quantum. First he discussed a concept of classical black hole complementarity for internal and external observers: the former seeing objects behind the horizon, but no Hawking radiation, and the latter observing Hawking radiation. In principle, these observers should see the same physics. The proposal of so called extreme complementarity sets up a perfect time reversal symmetry between the causal structures for internal and external observers. These assumptions allow for a conformal factor relating two observations, and the suggestion that generators of scale transformations have a non local character. The second part of his talk discussed cellular automata as deterministic systems with a quantum mechanical description. That is, acceptable hidden variables in a theory of dynamics of states.
Huw Price thankfully managed to avoid multiverses in the first half of his talk on Time's Arrow and Eddington's Challenge, starting with a clear explanation of the distinction between dynamic and block views of Time (although the potential use of both together was not, as usual, considered). The most notable proponents of the latter view, in relatively modern times, include Einstein and Boltzmann. On the dynamical side we have Eddington, who, in 1928, said:
Events give ... no indication that they undergo what has been described as the formality of taking place.Eddington supposedly coined the concept of the changing world as becoming, but that sounds rather like Hegel to me. Unfortunately, from this point on, the multiverse takes over as an attempt to address the challenge of Time's Arrow ... by creating universes that restore the overall symmetry.