Journal article

Solving the small-scale structure puzzles with dissipative dark matter

Robert Foot, Sunny Vagnozzi

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | IOP PUBLISHING LTD | Published : 2016

Abstract

Small-scale structure is studied in the context of dissipative dark matter, arising for instance in models with a hidden unbroken Abelian sector, so that dark matter couples to a massless dark photon. The dark sector interacts with ordinary matter via gravity and photon-dark photon kinetic mixing. Mirror dark matter is a theoretically constrained special case where all parameters are fixed except for the kinetic mixing strength, ϵ. In these models, the dark matter halo around spiral and irregular galaxies takes the form of a dissipative plasma which evolves in response to various heating and cooling processes. It has been argued previously that such dynamics can account for the inferred core..

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University of Melbourne Researchers

Grants

Funding Acknowledgements

RIP is supported by the Australian Research Council and SV is supported by the Vetenskapsradet (Swedish Research Council) through the Oskar Klein Centre. Part of this work was completed at the Niels Bohr Institute, which SV acknowledges for hospitality. We are grateful to Miguel Escudero for help regarding the comparison of our model to warm DM. SV acknowledges Aurel Schneider, Stuart Wyithe, Francis-Yon Cyr-Racine, and Federico Lelli for useful correspondence, and Jesus Zavala, Zurab Berezhiani, and Miguel Escudero for valuable discussions.