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A New Dark Force? Clues in the Smallest Galaxies

14 Jul 2017, 14:43 UTC
A New Dark Force? Clues in the Smallest Galaxies
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Title: SIDM on FIRE: Hydrodynamical Self-Interacting Dark Matter simulations of low-mass dwarf galaxies
Authors: V. H. Robles, J. S. Bullock, O. D. Elbert, A. Fitts, A. Gonzalez-Samaniego, M. Boylan-Kolchin, P. F. Hopkins, C.-A. Faucher-Giguere, D. Keres, and C. C. Hayward
First Author’s Institution: Department of Physics and Astronomy, University of California, Irvine
Status: Submitted to MNRAS, open access It’s a curious thing that the two classes of matter that make up our universe behave so differently. Baryonic matter, the matter out of which we and most things we interact with on a daily basis are made of, obey four fundamental forces. In comparison, dark matter seems to obey only one: gravity.The appearance of a single dark force may only be a guise—it’s possible that other forces are at work but, because of our inability to see dark matter, we are blind to them. Undeterred, physicists have dreamed up a multitude of possible new interactions between dark matter particles. Some of these models were put forward to explain observations that gravity-only dark matter (called cold dark matter, or CDM, for short) could not explain. These problems included the existence of galaxies with lower densities than expected at their centers (the core-cusp ...

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