Berlin 2014 – wissenschaftliches Programm

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GR: Fachverband Gravitation und Relativitätstheorie

GR 7: Quantum Gravity and Quantum Cosmology I

GR 7.2: Vortrag

Montag, 17. März 2014, 17:50–18:10, SPA SR220

On the relation between canonical and covariant Loop Quantum Gravity — •Antonia Zipfel — Instytut Fizyki Teoretycznej, Uniwersytet Warszawski, Poland

Loop quantum gravity is a background independent and non-perturbative approach towards a quantum theory of gravity that divides into a canonical and covariant (or spin foam) model. Heuristically, spin foams can be understood as the Feynman graphs of Quantum Gravity. Yet, summing over all `histories' would lead to a projector on the physical Hilbert space of the canonical theory rather than to a true propagator due to the constraint nature of GR. Following this idea we construct a spin-foam operator acting on the kinematic Hilbert space and analyze its properties.