16 citations · 24 across the 4 of their papers we have counts for
4 papers
Spectrum of Primordial Gravitational Waves in Presence of a Cosmic String
S. Azar Ag Galeh, A. M. Abbassi, M. H. Abbassi
In this paper we consider an inflating universe with long straight cosmic string along z-axis. We show that the effect of cosmic string can be taken as a perturbation on the backgr…
Trans-Planckian Effect in Cosmology
S. Cheraghchi, F. Shojai, M. H. Abbassi
Apart from the assumption that the inflation started at an infinite time in the past, the more realistic initial state of the quantum fluctuations is described by a mixed quantum s…
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…
Anisotropic Mimetic Cosmology
M. H. Abbassi, A. Jozani, H. R. Sepangi
We consider a mimetic set up in which the mimetic scalar is coupled to a vector field. It is shown that such a field with a time-like component does not contribute to the backgroun…