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Potential-density pairs for axisymmetric galaxies: the influence of scalar fields

We present a formulation for potential-density pairs to describe axisymmetric galaxies in 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 axisymmetric systems and the multipole expansion of the Yukawa potential is given. In particular, we have computed potential-density pairs of galactic disks for an exponential profile and their rotation curves.

preprint2005arXivOpen access
M. A. Rodriguez-MezaJorge L. Cervantes-CotaM. I. PedrazaJ. F. TlapancoE. M. De la Calleja
astro-phgr-qc
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M. A. Rodriguez-MezaJorge L. Cervantes-CotaM. I. PedrazaJ. F. TlapancoE. M. De la Calleja

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