期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 10, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2013/10/012
关键词
dark matter theory; dark matter simulations; modified gravity
资金
- HPC Infrastructure for Grand Challenges of Science and Engineering Project
- European Regional Development Fund under the Innovative Economy Operational Programme
- Polish National Science Center [DEC-2011/01/D/ST9/01960]
- Spanish Ministerio de Ciencia e Innovacion (MICINN) in Spain through the Ramon y Cajal programme [AYA 2009-13875-C03-02, AYA2009-12792-C03-03, C5D2009-00064, CAM S2009/ESP-1496]
- European Union [PITN-GA-2011-289442]
- Ministerio de Ciencia e Innovacion (MICINN) [CSD-2007-00050]
We investigate how long-range scalar interactions affect the properties of dark matter haloes. For doing so we employ the ReBEL model which implements an additional interaction between dark matter particles. On the phenomenological level this is equivalent to a modification of gravity. We analyse the differences between five ReBEL models and ACDM using a series of high resolution cosmological simulations. Emphasis is placed on investigating how halo properties change in the presence of a fifth force. We report that the density profile of ReBEL haloes is well described by the NFW profile but with mean concentrations from 5% to a few times higher than the standard ACDM value. We also find a slight increase of the halo spin for haloes more massive than 5 x 10(11) h(-1)M(circle dot), reflecting a higher rotational support of those haloes due to scalar forces. In addition, the dark matter haloes in our models are more spherical than their counterparts in ACDM. The ReBEL haloes are also more virialised, with a large difference from ACDM for strong fifth forces and a much smaller change for weak scalar interactions.
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