Dipolar dark matter simulations on galaxy scales with the ramses code

Author:

Stahl Clément1ORCID,Famaey Benoit1ORCID,Thomas Guillaume23,Dubois Yohan4,Ibata Rodrigo1

Affiliation:

1. Observatoire astronomique de Strasbourg, Université de Strasbourg , CNRS UMR 7550, 11 rue de l’Université, 67000 Strasbourg, France

2. Instituto de Astrofísica de Canarias , E-38205 La Laguna, Tenerife, Spain

3. Departmento de Astrofísica, Universidad de La Laguna, , E-38206 La Laguna, Tenerife, Spain

4. Institut d’Astrophysique de Paris, CNRS, Sorbonne Université , UMR 7095, 98bis bd Arago, 75014 Paris, France

Abstract

Abstract We numerically explore on galaxy scales the dipolar dark matter (DM) model based on the concept of gravitational polarization. This DM model has been proposed as a natural way to reproduce observed tight galactic scaling relations such as the baryonic Tully–Fisher relation and the Radial Acceleration Relation. We present a customized version of the RAMSES code including for the first time the dynamics of this Dipolar DM in N-body simulations. As a first application of this code, we check that we recover an equilibrium configuration that had been found analytically, where a low density Dipolar DM halo is at rest with respect to its central galaxy, recovering the aforementioned scaling relations. A characteristic signature of this equilibrium model is that it harbours a dynamical instability with a characteristic time depending on the Dipolar DM halo density, which we recover numerically. This represents a first step towards more involved simulations needed to test this framework, ranging from galaxy interactions to structure formation.

Funder

European Research Council

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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