16 citations · 27 across the 2 of their papers we have counts for
7 papers
On the initial singularity in Kantowski-Sachs spacetime
Elham Ghorani, Yaghoub Heydarzade
The emergent universe scenario is a proposal for resolving the Big Bang singularity problem in the standard Friedmann-Lemaitre-Robertson-Walker cosmology. In the context of this sc…
FLRW-Cosmology in Generic Gravity Theories
Metin Gurses, Yaghoub Heydarzade
We prove that for the Friedmann-Lemaitre-Robertson-Walker metric, the field equations of any generic gravity theory in arbitrary dimensions are of the perfect fluid type. The cases…
Superposition of FLRW Universes
Metin Gurses, Yaghoub Heydarzade, Bayram Tekin
We show that (1) the Einstein field equations with a perfect fluid source admit a nonlinear superposition of two distinct homogenous Friedman-Lemaitre-Robertson-Walker (FLRW) metri…
Cosmological Singularities in Conformal Weyl Gravity
Yaghoub Heydarzade
In this work, we study the issue of the past and future cosmological singularities in the context of the fourth-order conformal Weyl gravity. In particular, we investigate the emer…
Black hole solutions and Euler equation in Rastall and generalized Rastall theories of gravity
H. Moradpour, Y. Heydarzade, C. Corda +2
Focusing on the special case of generalized Rastall theory, as a subclass of the non-minimal curvature-matter coupling theories in which the field equations are mathematically simi…
NAT Black Holes
Metin Gurses, Yaghoub Heydarzade, Cetin Senturk
We study some physical properties of black holes in Null Aether Theory (NAT)--a vector-tensor theory of gravity. We first review the black hole solutions in NAT and then derive the…