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Dark matter-radiation interactions: the impact on dark matter haloes

Schewtschenko, Jascha; Wilkinson, Ryan; Baugh, Carlton; Boehm, Celine; Pascoli, Silvia

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Authors

Jascha Schewtschenko

Ryan Wilkinson

Celine Boehm



Abstract

Interactions between dark matter (DM) and radiation (photons or neutrinos) in the early Universe suppress density fluctuations on small mass scales. Here, we perform a thorough analysis of structure formation in the fully non-linear regime using N-body simulations for models with DM–radiation interactions and compare the results to a traditional calculation in which DM only interacts gravitationally. Significant differences arise due to the presence of interactions, in terms of the number of low-mass DM haloes and their properties, such as their spin and density profile. These differences are clearly seen even for haloes more massive than the scale on which density fluctuations are suppressed. We also show that semi-analytical descriptions of the matter distribution in the non-linear regime fail to reproduce our numerical results, emphasizing the challenge of predicting structure formation in models with physics beyond collisionless DM.

Citation

Schewtschenko, J., Wilkinson, R., Baugh, C., Boehm, C., & Pascoli, S. (2015). Dark matter-radiation interactions: the impact on dark matter haloes. Monthly Notices of the Royal Astronomical Society, 449(4), 3587-3596. https://doi.org/10.1093/mnras/stv431

Journal Article Type Article
Acceptance Date Feb 24, 2015
Online Publication Date Apr 10, 2015
Publication Date Jun 1, 2015
Deposit Date Dec 17, 2014
Publicly Available Date Apr 22, 2015
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 449
Issue 4
Pages 3587-3596
DOI https://doi.org/10.1093/mnras/stv431
Keywords Astroparticle physics, Galaxies: haloes, Dark matter, Large-scale structure of Universe.
Public URL https://durham-repository.worktribe.com/output/1415184
Related Public URLs http://arxiv.org/abs/1412.4905

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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.






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