A. Barreira
Halo model and halo properties in Galileon gravity cosmologies
Barreira, A.; Li, B.; Hellwing, W.A.; Lombriser, L.; Baugh, C.M.; Pascoli, S.
Authors
Professor Baojiu Li baojiu.li@durham.ac.uk
Professor
W.A. Hellwing
L. Lombriser
Professor Carlton Baugh c.m.baugh@durham.ac.uk
Professor
Professor Silvia Pascoli silvia.pascoli@durham.ac.uk
Visiting Professor
Abstract
We investigate the performance of semi-analytical modelling of large-scale structure in Galileon gravity cosmologies using results from N-body simulations. We focus on the Cubic and Quartic Galileon models that provide a reasonable fit to CMB, SNIa and BAO data. We demonstrate that the Sheth-Tormen mass function and linear halo bias can be calibrated to provide a very good fit to our simulation results. We also find that the halo concentration-mass relation is well fitted by a power law. The nonlinear matter power spectrum computed in the halo model approach is found to be inaccurate in the mildly nonlinear regime, but captures reasonably well the effects of the Vainshtein screening mechanism on small scales. In the Cubic model, the screening mechanism hides essentially all of the effects of the fifth force inside haloes. In the case of the Quartic model, the screening mechanism leaves behind residual modifications to gravity, which make the effective gravitational strength time-varying and smaller than the standard value. Compared to normal gravity, this causes a deficiency of massive haloes and leads to a weaker matter clustering on small scales. For both models, we show that there are realistic halo occupation distributions of Luminous Red Galaxies that can match both the observed large-scale clustering amplitude and the number density of these galaxies.
Citation
Barreira, A., Li, B., Hellwing, W., Lombriser, L., Baugh, C., & Pascoli, S. (2014). Halo model and halo properties in Galileon gravity cosmologies. Journal of Cosmology and Astroparticle Physics, 2014(04), Article 029. https://doi.org/10.1088/1475-7516/2014/04/029
Journal Article Type | Article |
---|---|
Publication Date | Apr 30, 2014 |
Deposit Date | Jan 13, 2014 |
Publicly Available Date | Mar 28, 2024 |
Journal | Journal of Cosmology and Astroparticle Physics |
Publisher | IOP Publishing |
Peer Reviewed | Peer Reviewed |
Volume | 2014 |
Issue | 04 |
Article Number | 029 |
DOI | https://doi.org/10.1088/1475-7516/2014/04/029 |
Keywords | Modified gravity, Cosmological simulations, Power spectrum, Dark energy theory. |
Files
arXiv version
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Copyright Statement
arXiv version
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