Ph.D. California Institute of Technology, 1974 A.B. (Summa cum laude) Harvard, 1966
External ID 1254

Talks by Rafael Sorkin

Lorentz symmetry: Broken, intact or deformed?

Abstract Is aether technically natural?
I will discuss whether higher energy Lorentz violation should be considered a natural expectation in theories of quantum gravity with a preferred frame.

If spacetime is a causal set then Lorentz symmetry is unbroken

Quantum superpositions of the speed of light

Projective Statistics in Quantum Gravity

Abstract To the extent that spacetime remains a manifold M on small scales, excitations of the spatial topology can function as particles called topological geons. In a first quantized theory of topological geons (aka continuum quantum gravity without topology change), different irreducible unitary representations of the mapping-class group G of M, yield different superselection sectors of the theory. In some of these sectors the geons behave as fermions, even though gravitons themselves are of course bosons.