Dark Matter haloes as probes of modified gravity

Details Dark Matter haloes as probes of modified gravity Dark Matter haloes as probes of modified gravity

2011-11-30

arxiv.org/abs/1111.7257v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

35 pages (JCAP format), 18 figures, prepared for submission to JCAP

Scientific paper

We investigate the effect of hypothetical long-range scalar interactions present in the Dark Matter sector on to the internal properties of DM haloes. We employ a particular formulation of such modified cosmology called the ReBEL model, in which the additional interactions between Dark Matter particles are modeled on a phenomenological level as modification of the gravity. We perform a series of high resolution cosmological N-body simulations of 512^3 particles for five different ReBEL models and for one reference LCDM model. We compare density profiles, velocity curves, the spin and shape parameters (triaxiality and ellipcities) between models using statistical distributions of these quantities as well as direct comparison of haloes cross-correlated between the ReBEL and the ReBEL models. We also test and compare the state of the virialisation of the haloes in our models. We find that statistically the ReBEL halo density profiles are also described quite well by the Navarro-Frenk-White profile, but we denote an increase of the mean virial concentration parameter by 6% to 15% for our range of tested ReBEL models. We also find that the velocity curves for our modified gravity haloes reach their maxima at smaller radii when compared to standard cosmology haloes. We also denote a slight increase of the mean of the halo spin parameter reflecting a bit higher rotational support of the haloes due to the scalar interacting Dark Matter. On the other hand we do not find any significant differences in shapes of the haloes between standard and modified gravity paradigms. Finally we report that in the class of modified Dark Matter models we study here the overall virialisation state of DM halo is higher compared to the LCDM haloes. The cosmological implications and prospects for using haloes as probes of modified gravity is briefly discussed.

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