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Using the Milky Way satellites to study interactions between cold dark matter and radiation.

Boehm, C. and Schewtschenko, J. A. and Wilkinson, R. J. and Baugh, C. M. and Pascoli, S. (2014) 'Using the Milky Way satellites to study interactions between cold dark matter and radiation.', Monthly notices of the Royal Astronomical Society : letters., 445 (1). L31-L35.


The cold dark matter (CDM) model faces persistent challenges on small scales. In particular, the model significantly overestimates the number of satellite galaxies around the Milky Way. Attempts to solve this problem remain controversial and have even led some to abandon CDM altogether. However, current simulations are limited by the assumption that dark matter feels only gravity. Here we show that including interactions between CDM and radiation (photons or neutrinos) leads to a dramatic reduction in the number of satellite galaxies, providing a potential solution to the Milky Way satellite problem and indicating that physics beyond gravity may be essential to make accurate predictions of structure formation on small scales. The methodology introduced here gives constraints on dark matter interactions that are significantly improved over those from the cosmic microwave background.

Item Type:Article
Additional Information:
Keywords:Galaxies: abundances, Galaxies: dwarf, Dark matter, Large-scale structure of Universe.
Full text:(NA) Not Applicable
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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society Letters © 2014 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:17 July 2014
Date deposited:09 September 2014
Date of first online publication:01 September 2014
Date first made open access:No date available

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