Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 445, Issue 1, Pages L31-L35Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnrasl/slu115
Keywords
galaxies: abundances; galaxies: dwarf; dark matter; large-scale structure of Universe
Categories
Funding
- Durham University Alumnus Scholarship
- STFC Quota grant [ST/K501979/1]
- STFC [ST/F001166/1, ST/G000905/1]
- European Union FP7 ITN INVISIBLES (Marie Curie Actions) [PITN-GA-2011-289442]
- BIS National E-infrastructure capital grant [ST/K00042X/1]
- STFC capital grant [ST/H008519/1]
- STFC DiRAC Operations grant [ST/K003267/1]
- Durham University
- Spanish MINECO (Centro de excelencia Severo Ochoa Program) [SEV-2012-0249]
- STFC [ST/F002300/1, ST/I001166/1, ST/I00162X/1, ST/H008519/1, ST/G000905/1, ST/L00075X/1, ST/K00042X/1, ST/K501979/1, ST/F002289/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K501979/1, ST/I001166/1, 1226840, ST/H008519/1, ST/I00162X/1, ST/F002289/1, ST/K00042X/1, ST/G000905/1, ST/L00075X/1, ST/F002300/1] Funding Source: researchfish
Ask authors/readers for more resources
The cold dark matter (CDM) model faces persistent challenges on small scales. In particular, taken at face value, the model significantly overestimates the number of satellite galaxies around the Milky Way. Attempts to solve this problem remain open to debate 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, alleviating 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.
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