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Title: Simultaneous effect of modified gravity and primordial non-Gaussianity in large scale structure observations

In this work we study the simultaneous effect of primordial non-Gaussianity and the modification of the gravity in f(R) framework on large scale structure observations. We show that non-Gaussianity and modified gravity introduce a scale dependent bias and growth rate functions. The deviation from ΛCDM in the case of primordial non-Gaussian models is in large scales, while the growth rate deviates from ΛCDM in small scales for modified gravity theories. We show that the redshift space distortion can be used to distinguish positive and negative f{sub NL} in standard background, while in f(R) theories they are not easily distinguishable. The galaxy power spectrum is generally enhanced in presence of non-Gaussianity and modified gravity. We also obtain the scale dependence of this enhancement. Finally we define galaxy growth rate and galaxy growth rate bias as new observational parameters to constrain cosmology.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Department of Physics, Sharif University of Technology, P.O. Box 11365–9161, Tehran (Iran, Islamic Republic of)
  2. Department of Physics, Kharazmi University, Tehran (Iran, Islamic Republic of)
  3. School of Astronomy, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395–5531, Tehran (Iran, Islamic Republic of)
  4. Department of Physics, Institute for Advanced Studies in Basic Science (IASBS), P.O. Box 45195–1159, Zanjan (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
22369819
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 01; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGY; GALAXIES; GRAVITATION; RED SHIFT; SPACE; SPECTRA