Structure Formation With a Long-Range Scalar Dark Matter Interaction

Details Structure Formation With a Long-Range Scalar Dark Matter Interaction Structure Formation With a Long-Range Scalar Dark Matter Interaction

2004-12-22

arxiv.org/abs/astro-ph/0412586v2

Phys.Rev. D71 (2005) 083505

Astronomy and Astrophysics

Astrophysics

10 pages, 7 figures, revtex4. v2: minor improvements, refs added, version to appear in PRD

Scientific paper

10.1103/PhysRevD.71.083505

Numerical simulations show that a long-range scalar interaction in a single species of massive dark matter particles causes voids between the concentrations of large galaxies to be more nearly empty, suppresses accretion of intergalactic matter onto galaxies at low redshift, and produces an early generation of dense dark matter halos. These three effects, in moderation, seem to be improvements over the Lambda CDM model predictions for cosmic structure formation. Because the scalar interaction in this model has negligible effect on laboratory physics and the classical cosmological tests, it offers an observationally attractive example of cosmology with complicated physics in the dark sector, notably a large violation of the weak equivalence principle.

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