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GR: Gravitation und Relativitätstheorie

GR 3: Alternative klassische Gravitationstheorien

GR 3.1: Fachvortrag

Montag, 24. März 2003, 18:10–18:30, A310

Potential-density pairs for spherical galaxies within scalar-tensor theories — •Jorge L. Cervantes-Cota^1,2 and Mario A. Rodriguez-Meza² — ¹Astrophysikalisches Institut Potsdam — ²Instituto Nacional de Investigaciones Nucleares (ININ)

A family of potential–density pairs has been found for spherical halos and bulges of galaxies within the Newtonian limit of scalar–tensor theories of gravity. The scalar field is described by a modified Helmholtz equation with a source, that is coupled to the standard Poisson equation of Newtonian gravity. The net gravitational force is given by two contributions: the standard Newtonian potential plus a term stemming from massive scalar fields. General solutions have been found for spherical systems and we compute potential–density pairs of spherical, galactic systems, and some other astrophysical quantities that are relevant to generate initial conditions for spherical galaxy simulations, as well.