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GR: Fachverband Gravitation, Relativistische Astrophysik und Kosmologie

GR 10: Poster

GR 10.3: Poster

Mittwoch, 18. März 2026, 16:15–18:45, Redoutensaal

Quantum gravity via Lorentz-invariant gravity — •René Friedrich — Strasbourg

Lorentzian spacetime, incredibly, proves to be a 100-year-old optical illusion, an impossible object: The banal fact of the non-zero length of worldlines of lightlike light rays shows us that spacetime diagrams and spacetime manifolds have Euclidean metric, because if they were Lorentzian (pseudo-Riemannian), the length of lightlike phenomena would be zero. Accordingly, spacetime is not fundamental, it is mere observation, and the underlying Lorentz-invariant real universe (compatible with quantum mechanics) consists of worldlines in absolute 3D space, each worldline being parameterized by its respective proper time. - Regarding gravity, we can use the fact that gravity may be described not only as curved spacetime, but also equivalently as gravitational time dilation in threedimensional flat space: A comparison Schwarzschild metric / Minkowski metric shows that the difference between flat and curved spacetime can be entirely reduced to gravitational time dilation, paving the way to quantum gravity: Gravity in the form of gravitational time dilation slows down the frequency of the proper time of worldlines of massive particles, corresponding to the time evolution exp -imc2τ/ℏ of their respective wave functions. - More: Quantum gravity without trouble, Quantengravitation ohne Mühe, La gravité quantique sans peine.

Keywords: Gravitation; Gravitational time dilation; Time evolution; Spacetime interval; Pseudometric