Göttingen 2025 – scientific programme

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GR: Fachverband Gravitation und Relativitätstheorie

GR 9: Poster

GR 9.8: Poster

Wednesday, April 2, 2025, 16:15–18:15, ZHG Foyer 1. OG

Quantum gravity by elimination of spacetime - From the 4D manifold to Lorentz-invariant 1D worldlines — •René Friedrich — Strasbourg

The current interpretation of general relativity (based on the concept of Einstein and Grossmann in 1913) is a sort of "astrometry": Curved spacetime is perfect for astronomical observation and experimental physics, but not for theoretical physics because it is complex, redundant and does not admit the smooth decantation of fundamental conclusions (including quantum gravity). Moreover, since 1905 we know that each particle is following its own clock, that there is no common absolute time axis, and, by consequence, that spacetime is no longer a fundamental notion as it was within Newtonian spacetime. - And gravity? It will also be shown that gravity is perfectly equivalent to gravitational time dilation, acting on onedimensional worldlines in uncurved threedimensional space, paving the way for a worldline-based concept that is compatible with quantum mechanics: Worldlines of quantum systems with mass are parameterized by their respective proper time frequency, and gravity in the form of gravitational time dilation is just modifying this frequency of the worldline. - Book: Quantum gravity without trouble, Quantengravitation ohne Mühe, La gravité quantique sans peine.

Keywords: Quantum gravity; Spacetime; General relativity