27 citations · 118 across the 26 of their papers we have counts for
26 papers
Gravitational Waves in a Closed Spacetime via Deviation Equation
Jafar Khodagholizadeh, Amir H. Abbassi, Ali Vahedi +1
Within the closed universe, we obtain the amplitude and frequency of gravitational waves in the terms of discrete wave numbers, wave propagation time, and cosmological constant usi…
Signatures of Spatial Curvature on Growth of Structures
Mohammad H. Abbassi, Amir H. Abbassi
We write down Boltzmann equation for massive particles in a spatially curved FRW universe and solve the approximate line-of-sight solution for evolution of matter density, includin…
An analytical approach to the CMB Polarization in a Spatially Closed background
Pedram Niazy, Amir H. Abbassi
The scalar mode polarization of the cosmic microwave background is derived in a spatially closed universe from the Boltzmann equation using the line of sight integral method. The E…
Curvature and topology dependency of the cosmological spectra
Ali A. Asgari, Amir H. Abbassi, Jafar Khodagholizadeh
In this article we investigate dependency of the adiabatic and entropy spectral indices of the cosmological perturbations on the geometry and topology of the background universe. O…
Imprints of intrinsic and exterior curvatures in cosmology
Ali A. Asgari, Amir H. Abbassi
Nowadays, according to the observational evidences the curvature parameter of the universe is neglected and spatially flat FLRW model is on the top of interest for cosmologists. Ho…
An analytical approach to the CMB anisotropies in a Spatially Closed background
Pedram Niazy, Amir H. Abbassi
The scalar mode temperature fluctuations of the cosmic microwave background has been derived in a spatially closed universe from two different methods. First, by following the phot…