Dark Matter Gravitational Clustering With a Long-Range Scalar Interaction

Details Dark Matter Gravitational Clustering With a Long-Range Scalar Interaction Dark Matter Gravitational Clustering With a Long-Range Scalar Interaction

2008-09-11

arxiv.org/abs/0809.1976v4

Phys.Rev.D80:083522,2009

Astronomy and Astrophysics

Astrophysics

16 pages, 12 figures, accepted for publication in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.80.083522

We explore the possibility of improving the $\Lambda$CDM model at megaparsec scales by introducing a scalar interaction which increases the mutual gravitational attraction of dark matter particles. Using N-body simulations, we study the spatial distribution of dark matter particles and halos. We measure the effect of modifications in the Newton's gravity on properties of the two-point correlation function, the dark matter power spectrum, the cumulative halo mass function and density probability distribution functions. The results look promising: the scalar interactions produce desirable features at megaparsec scales without spoiling the $\Lambda$CDM successes at larger scales.

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