23 citations · 149 across the 25 of their papers we have counts for
10 papers · 1 filter
Accelerating Universe in Terms of Hankel Function Index
K. Suratgar, M. Mohsenzadeh, E. Yusofi +1
In this paper, cosmology is proposed for the accelerating universe with asymptotic de Sitter expansion in terms of Hankel function index . To some extent, both the initia…
Quasi-de Sitter Solution, Negative Norm State and Krein Space in Cosmology
Majid Mohsenzadeh
Recent observational data have shown two important results about cosmic inflation: First, the primordial power spectrum is approximately scale invariant. Secondly, the space-time g…
A Covariant Approach for Particle Creation in Non-flat Background
A. R. Ziyaee, M. Mohsenzadeh, E. Yusofi
Krein approach is used to study the particle creation during quasi-de Sitter inflation in different background space-times. In the conventional method for calculating the created p…
Higher Order Corrections to Asymptotic-de Sitter Inflation
M. Mohsenzadeh, E. Yusofi
Since trans-Planckian considerations can be associated with the re-definition of the initial vacuum, we investigate further the influence of trans-Planckian physics on the spectra…
Inflation in Non-de Sitter Background with Coherent States
E. Yusofi, M. Mohsenzadeh, M. R. Tanhayi
We use the excited coherent states built over the initial non-de Sitter modes, to study the modification of spectra of primordial scalar fluctuation. Non-de Sitter modes are actual…
Friedmann-like equations for High Energy Area of Universe
E. Yusofi, M. Mohsenzadeh
In this paper, evolution of the high energy area of universe, through the scenario of 5 dimensional (5D) universe, has been studied. For this purpose, we solve Einstein equations f…
Trans-Planckian Scale and Krein Space Quantization
A. Sojasi, M. Mohsenzadeh
In this work, Krein space quantization method is applied to eliminate the Ultraviolet divergence of Green functions. This paper shows that the power spectrum of scalar field fluctu…
Spectrum of Gravitational Waves in Krein Space Quantization
M. Mohsenzadeh, A. Sojasi, E. Yusofi
The main goal of this paper is to derive the primordial power spectrum for the scalar perturbations generated as a result of quantum fluctuations during an inflationary pe- riod by…
Bulk Scale Factor at Very Early Universe
M. Mohsenzadeh, E. Yusofi
In this paper we propose a higher dimensional Cosmology based on FRW model and brane-world scenario. We consider the warp factor in the brane-world scenario as a scale factor in 5-…
Power Spectrum in Krein Space Quantization
M. Mohsenzadeh, S. Rouhani, M. V. Takook
The power spectrum of scalar field and space-time metric perturbations produced in the process of inflation of universe, have been presented in this paper by an alternative approac…