Velocity Dependence from Resonant Self-Interacting Dark Matter

Xiaoyong Chu (Institute of High Energy Physics, Austrian Academy of Sciences, Nikolsdorfer Gasse 18, 1050 Vienna, Austria) ; Camilo Garcia-Cely (Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany) ; Hitoshi Murayama (Department of Physics, University of California, Berkeley, California 94720, USA; Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo, Kashiwa 277-8583, Japan; Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA; Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany)

The dark matter density distribution in small-scale astrophysical objects may indicate that dark matter is self-interacting, while observations from clusters of galaxies suggest that the corresponding cross section depends on the velocity. Using a model-independent approach, we show that resonant self-interacting dark matter can naturally explain such a behavior. In contrast to what is often assumed, this does not require a light mediator. We present explicit realizations of this mechanism and discuss the corresponding astrophysical constraints.

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Published on:
22 February 2019
Publisher:
APS
Published in:
Physical Review Letters , Volume 122 (2019)
Issue 7
DOI:
https://doi.org/10.1103/PhysRevLett.122.071103
arXiv:
1810.04709
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

Fulltext files: