Flat rotation curves using scalar-tensor theories

Abstract

We computed flat rotation curves from scalar-tensor theories in their weak field limit. Our model, by construction, fits a flat rotation profile for velocities of stars. As a result, the form of the scalar field potential and DM distribution in a galaxy are determined. By taking into account the constraints for the fundamental parameters of the theory $(\lambda ,\alpha )$, it is possible to obtain analytical results for the density profiles. For positive and negative values of $\alpha$, the DM matter profile is as cuspy as NFW's.

To appear in Journal of Physics: Conference Series: VII Mexican School on Gravitation and Mathematical Physics. 26 November to 1 December 2006, Playa del Carmen, Quintana Roo, Mexico

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• Scalar-field Pressure in Induced Gravity with Higgs Potential and Dark Matter
• Summary of session A4 at the GRG18 conference: Alternative Theories of Gravity
• Constraining the attractive fifth force in the general free scalar-tensor gravity with solar system experiments
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