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Constraints on Growth Index from LSS

Published online by Cambridge University Press:  01 July 2015

Athina Pouri ,
Spyros Basilakos  and
Manolis Plionis
Athina Pouri
Affiliation:
Academy of Athens, Research Center for Astronomy and Applied Mathematics, Soranou Efesiou 4, 11527, Athens, Greece emails: athpouri@phys.uoa.gr, svasil@academyofathens.gr Faculty of Physics, Department of Astrophysics - Astronomy - Mechanics, University of Athens, Panepistemiopolis, Athens 157 83
Spyros Basilakos
Affiliation:
Academy of Athens, Research Center for Astronomy and Applied Mathematics, Soranou Efesiou 4, 11527, Athens, Greece emails: athpouri@phys.uoa.gr, svasil@academyofathens.gr
Manolis Plionis
Affiliation:
Physics Dept., Sector of Astrophysics, Astronomy & Mechanics, Aristotle Univ. of Thessaloniki, Thessaloniki 54124, Greece Instituto Nacional de Astrofísica Óptica y Electronica, 72000 Puebla, México IAASARS, National Observatory of Athens, P.Pendeli 15236, Greecemplionis@auth.gr
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Abstract

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We utilize the clustering properties of the Luminous Red Galaxies (LRGs) and the growth rate data in order to constrain the growth index (γ) of the linear matter fluctuations based on a standard χ2 joint likelihood analysis between theoretical expectations and data. We find a value of γ=0.56± 0.05, perfectly consistent with the expectations of the ΛCDM model, and Ωm0 =0.29± 0.02, in very good agreement with the latest Planck results. Our analysis provides significantly more stringent growth index constraints with respect to previous studies as indicated by the fact that the corresponding uncertainty is only ∼ 0.09 γ.

Keywords

cosmological parametersdark matterlarge-scale structure of universe
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Symposium S306: Statistical Challenges in 21st Century Cosmology , May 2014 , pp. 255 - 257
Copyright
Copyright © International Astronomical Union 2015 

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