Berlin 2014 – wissenschaftliches Programm

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GR: Fachverband Gravitation und Relativitätstheorie

GR 14: Alternative classical theories of gravitation I

GR 14.2: Vortrag

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

Parameterized post-Newtonian formalism for multimetric gravity — •Manuel Hohmann — Tartu University, Estonia

We discuss the post-Newtonian limit of multimetric gravity theories with N ≥ 2 metric tensors and a corresponding number of standard model copies, and construct an extension of the parameterized post-Newtonian (PPN) formalism. This extended formalism allows a characterization of multimetric gravity theories by a set of constant parameters. The multimetric PPN parameters are in close correspondence to the standard PPN parameters, which have been measured using high-precision experiments in the solar system. We apply our formalism to a class of theories which we previously discussed in the context of cosmology and gravitational waves, and which feature an accelerating expansion of the universe. A comparison between our results and the measured PPN parameters shows that multimetric gravity is fully compatible with solar system observations.