108 citations · 477 across the 41 of their papers we have counts for
41 papers
Revisiting the Israel junction conditions in Einstein-Cartan gravity
S. Khakshournia, R. Mansouri
The Israel junction conditions of a thin shell in the context of Einstein-Cartan gravity are revisited. It is shown that with a choice of the torsion discontinuity taken to be orth…
On the stress-energy tensor of a null shell in Einstein-Cartan gravity
S. Khakshournia, R. Mansouri
The stress-energy tensor of a matter shell whose history coincides with a null hypersurface in the Einstein-Cartan gravity is revisited. It is demonstrated that with a proper choic…
Nonlinear phenomena in general relativity
Alireza Allahyari, Javad T. Firouzjaee, Reza Mansouri
The perturbation theory plays an important role in studying structure formation in cosmology and post-Newtonian physics, but not all phenomena can be described by the linear pertur…
Relativistic virial relation for cosmological structures
Reza Javadinezhad, Javad T. Firouzjaee, Reza Mansouri
Starting with the relativistic Boltzmann equation for a system of particles defined by a distribution function, we have derived the virial relation for a spherical structure within…
Cosmological black holes: the spherical perfect fluid collapse with pressure in a FRW background
Rahim Moradi, Javad T. Firouzjaee, Reza Mansouri
We have constructed a spherically symmetric structure model in a cosmological background filled with perfect fluid with non-vanishing pressure as an exact solution of Einstein equa…
The symmetry of the energy momentum tensor does not necessarily reflect the space-time symmetry: a viscous axially symmetric cosmological solution
Fatemeh Bagheri, Reza Mansouri
Applying the method of conformal metric to a given static axially symmetric vacuum solution of the Einstein equations, we have shown that there is no solution representing a cosmic…