Scattering of Dark Matter and Dark Energy

Details Scattering of Dark Matter and Dark Energy Scattering of Dark Matter and Dark Energy

2010-07-07

arxiv.org/abs/1007.1034v2

Phys.Rev.D82:083505,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 4 figures, minor changes reflect published version

Scientific paper

10.1103/PhysRevD.82.083505

We demonstrate how the two dominant constituents of the Universe, dark energy and dark matter, could possess a large scattering cross-section without considerably impacting observations. Unlike models involving energy exchange between the two fluids, the background cosmology remains unaltered, leaving fewer observational signatures. Following a brief review of the scattering cross-sections between cosmologically significant particles, we explore the implications of an elastic interaction between dark matter and dark energy. The growth of large scale structure is suppressed, yet this effect is found to be weak due to the persistently low dark energy density. Thus we conclude that the dark matter-dark energy cross section may exceed the Thomson cross-section by several orders of magnitude.

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