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GR: Fachverband Gravitation und Relativitätstheorie
GR 16: Experimental Tests
GR 16.1: Talk
Friday, March 24, 2023, 11:00–11:20, HSZ/0401
New search for differences in active and passive gravitational masses using Lunar Laser Ranging — •Claus Lämmerzahl1, Vishwa V. Singh2, Liliane Biskupek2, Jürgen Müller2, and Eva Hackmann1 — 1ZARM, University of Bremen — 2IfE, Leibniz Universität Hannover
Each body possesses three masses: inertial mass, passive gravitational mass (weight), and active gravitating mass. With MICROSCOPE the equality of inertial and passive gravitational mass has been confirmed at the order 10−15. Laboratory test confirmed the equality of active and passive mass at the order 10−5. Using Lunar Laser Ranging (LLR) data from 1970 to 2022, we obtained a new limit of 3.9 × 10−14 that improves the previous LLR-based result by two orders of magnitude. We also propose a new laboratory experiment for the search of a difference between active and passive masses, and present a new orbital analysis for stellar binary systems made of different masses. Finally, we add some remarks on active and passive charges.