Abstract
Two alternative theories to dark matter are investigated by testing their ability to describe consistently the dynamics of the Milky Way. The first one refers to a modified gravity theory having a running gravitational constant and the second assumes that dark matter halos are constituted by a Bose–Einstein condensation (BEC). The parameters of each model as well as those characterizing the stellar subsystems of the Galaxy were estimated by fitting the rotation curve of the Milky Way. Then, using these parameters, the vertical acceleration profile at the solar position was computed and compared with observations. The modified gravity theory overestimates the vertical acceleration derived from stellar kinematics while predictions of the BEC halo model are barely consistent with observations. However, a dark matter halo based on a collisionless fluid satisfies our consistency test, being the best model able to describe equally well the rotation curve and the vertical acceleration of the Galaxy.
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Acknowledgments
P.L.C.O thanks respectively to the Brazilian Agencies Coordenação de Pessoal de Nível Superior (CAPES) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for a PhD fellowship and the financial support, which has permitted his one year stay at the Observatoire de la Côte d’Azur.
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de Oliveira, P.L.C., de Freitas Pacheco, J.A. & Reinisch, G. Testing two alternative theories to dark matter with the Milky Way dynamics. Gen Relativ Gravit 47, 12 (2015). https://doi.org/10.1007/s10714-014-1849-1
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DOI: https://doi.org/10.1007/s10714-014-1849-1