München 2019 – scientific programme

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GR: Fachverband Gravitation und Relativitätstheorie

GR 8: Quantum Cosmology and Quantum Gravity I

GR 8.1: Invited Talk

Wednesday, March 20, 2019, 14:00–14:45, HS 4

Loop quantum cosmology, signature change, and the no- boundary proposal — •Martin Bojowald — The Pennsylvania State University, University Park, PA, USA

Loop quantum gravity suggests a discrete structure of space which should be relevant for physics at large energy scales, in particular near the big bang. Several unexpected consequences have been derived in loop quantum cosmology. The possibility of signature change at high density is one example, which not only reveals a heuristic kinship with the no-boundary proposal of Hartle and Hawking but also helps to solve stability problems recently found by Feldbrugge, Lehners and Turok in an application of Lorentzian path integrals.