Flat rotation curves using scalar-tensor theories

Details Flat rotation curves using scalar-tensor theories Flat rotation curves using scalar-tensor theories

2007-07-18

arxiv.org/abs/0707.2692v1

J.Phys.Conf.Ser.91:012007,2007

Astronomy and Astrophysics

Astrophysics

To appear in Journal of Physics: Conference Series: VII Mexican School on Gravitation and Mathematical Physics. 26 November to

Scientific paper

10.1088/1742-6596/91/1/012007

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.

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