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Simultaneous effect of modified gravity and primordial non-Gaussianity in large scale structure observations
, Article Journal of Cosmology and Astroparticle Physics ; Vol. 2014, issue. 1 , January , 2014 ; Khosravi, S ; Baghram, S ; Moshafi, H ; Sharif University of Technology
2014
Abstract
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 fNL in standard background, while in f(R) theories they are not easily distinguishable. The galaxy power spectrum is generally enhanced in presence of...
Non-Gaussian Primordial Perturbations and Inflationary Models
, M.Sc. Thesis Sharif University of Technology ; Mansouri, Reza (Supervisor) ; Khosravi, Shahram (Co-Advisor)
Abstract
This thesis is divided into two major parts. In the first half of the thesis we introduce and study primordial non-Gaussianity in the context of Inflationary Cosmology. Most recent cosmological observations indicate that Universe has experienced an inflationary phase during its very early moments of existence. Not only Inflation is a possible solution of FRW cosmology problems, but also it acts as the generator of all the structure in the Universe. According to standard Inflationary cosmology, the primordial fluctuations which are considered to be the seeds of the entire structure in the Universe are scale-invariant, adiabatic and Gaussian.However there is the possibility to have an...