DM haloes in the fifth-force cosmology
- Institute of Astronomy, University of Zielona Góra, ul. Lubuska 2, 65-001 Zielona Góra (Poland)
- Kapteyn Astronomical Institute, University of Groningen, P.O. Box 800, 9747 AV Groningen (Netherlands)
- Grupo de Astrofísica, Departamento de Física Teórica, Módulo C-8, Facultad de Ciencias, Universidad Autónoma de Madrid, 28049 Cantoblanco, Madrid (Spain)
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 ΛCDM 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 ΛCDM value. We also find a slight increase of the halo spin for haloes more massive than 5 × 10{sup 11}M{sub ☉}, 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 ΛCDM. The ReBEL haloes are also more virialised, with a large difference from ΛCDM for strong fifth forces and a much smaller change for weak scalar interactions.
- OSTI ID:
- 22282638
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2013, Issue 10; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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