Talk detail

Participant	't Hooft, Gerardus
Institution	Institute for Theoretical Physics - Leuvenlaan 4 - Utrecht - - Netherland

Session	PS	Accepted		Order	Time
Talk	Oral abstract	Title	Local Conformal Symmetry in Black Holes, Standard Model, and Quantum Gravity
Coauthors
Abstract	The black hole information problem and the firewall problem cause contradictions in the known laws of physics unless one assumes an extra local symmetry: conformal invariance. It must be an exact symmetry, spontaneously broken by the vacuum, in a way similar to the BEH mechanism. We note how this symmetry formally removes the horizon and the singularity inside black holes. For the Standard Model this symmetry is severely restrictive, demanding all coupling constants, masses and even the cosmological constant to be computable, in principle. Finally, this symmetry suggests that the Weyl action (the square of the Weyl curvature) should be added to the Einstein-Hilbert action. The ensuing indefinite metric states are briefly studied, and we attempt to understand the consequences by using the cellular automaton theory of quantum mechanics.
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