Dipolar dark matter simulations on galaxy scales with the RAMSES code

Clément Stahl (1) , Benoit Famaey (1) , Guillaume Thomas , Yohan Dubois (2) , Rodrigo Ibata (1)

1 ObAS - Observatoire astronomique de Strasbourg
2 IAP - Institut d'Astrophysique de Paris

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.

Mots clés: galaxies: general; dark matter; Astrophysics - Cosmology and Nongalactic Astrophysics; Astrophysics - Astrophysics of Galaxies

Domaines: Planète et Univers [physics]

Clément Stahl, Benoit Famaey, Guillaume Thomas, Yohan Dubois, Rodrigo Ibata. Dipolar dark matter simulations on galaxy scales with the RAMSES code. Monthly Notices of the Royal Astronomical Society, 2022, ⟨10.1093/mnras/stac2670⟩. ⟨insu-03794919⟩