225 citations · 1k across the 39 of their papers we have counts for
39 papers
D-bound and Bekenstein bound for McVittie solution surrounded by dark energy cosmological fields
H. Hadi, Y. Heydarzade, F. Darabi +1
The cosmological candidate fields for dark energy as quintessence, phantom and cosmological constant, are studied in terms of an entropic hypothesis imposed on the McVittie solutio…
Bounding f(R,T) gravity by particle creation
K. Asadiyan, F. Darabi, P. Pedram +1
We consider the possibility of the quantum vacuum states in f(R,T) gravity. Particularly, we study the Bogoliubov transformations associated to different vacuum states for some f(R…
Einstein and Rastall Theories of Gravitation in Comparison
F. Darabi, H. Moradpour, I. Licata +2
We profit by a recent paper of Visser claiming that Rastall gravity is equivalent to Einstein gravity to compare the two gravitational theories in a general way. Our conclusions ar…
Non-critical anisotropic Bianchi type string cosmology with -corrections
F. Naderi, A. Rezaei-Aghdam, F. Darabi
We present non-critical Bianchi type string cosmology solutions in the presence of central charge deficit term . The leading order string frame curvature appears to be in th…
Einstein Static Universe in Rastall Theory of Gravity
F. Darabi, K. Atazadeh, Y. Heydarzade
We investigate stability of the Einstein static solution against homogeneous scalar, vector and tensor perturbations in the context of Rastall theory of gravity. We show that this…
Braneworld Black Holes and Entropy Bounds
Y. Heydarzade, H. Hadi, C. Corda +1
The Bousso's D-bound entropy for the various possible black hole solutions on a 4-dimensional brane is checked. It is found that the D-bound entropy here is apparently different fr…
A Generalization to the Rastall Theory and Cosmic Eras
H. Moradpour, Y. Heydarzade, F. Darabi +1
A generalized version for the Rastall theory is proposed showing the agreement with the cosmic accelerating expansion. In this regard, a coupling between geometry and the pressurel…
Einstein static universe from GUP
K. Atazadeh, F. Darabi
We consider the existence and stability of the Einstein static universe under the Generalized Uncertainty Principle (GUP) effects. We show that this solution in the presence of per…
Black Hole Solutions in Rastall Theory
Y. Heydarzade, H. Moradpour, F. Darabi
The Reissner-Nordström black hole solution in a generic cosmological constant background in the the context of Rastall gravity is obtained. It is shown that the cosmological consta…
Bousso's Covariant Entropy Bound and Padmanabhan's Emergent Universe
H. Hadi, Y. Heydarzade, F. Darabi
We study the Padmanabhan's emergent Universe in the context of Bousso's covariant entropy conjecture. We find that for a flat Universe, this conjecture can be applied for the syste…
Evolution of spherical over-densities in tachyon scalar field model
M. R. Setare, F. Felegary, F. Darabi
We study the tachyon scalar field model in flat FRW cosmology with the particular potential and the scale factor behavior . We consider the spherical collapse mo…
On the stability of Einstein static universe at background level in massive bigravity
M. Mousavi, F. Darabi
We study the static cosmological solutions and their stability at background level in the framework of massive bigravity theory with Friedmann-Robertson-Walker (FRW) metrics. By th…
Emergent Cosmos in Einstein-Cartan Theory
H. Hadi, Y. Heydarzade, M. Hashemi +1
Based on the Padmanabhan's proposal, the accelerated expansion of the universe can be driven by the difference between the surface and bulk degrees of freedom in a region of space,…
Emergent universe in Horava-Lifshitz-like F(R) gravity
M. Khodadi, Y. Heydarzade, F. Darabi +1
We investigate the Einstein static universe (ESU) and the emergent universe scenario in the framework of Hořava-Lifshitz-like gravity. We first perform a dynamical analysis…
Classical and quantum cosmology of minimal massive bigravity
F. Darabi, M. Mousavi
In a Friedmann-Robertson-Walker (FRW) space-time background we study the classical cosmological models in the context of recently proposed theory of nonlinear minimal massive bigra…
Einstein static universe on the brane supported by extended Chaplygin gas
Y. Heydarzade, F. Darabi, K. Atazadeh
We study the cosmological models in which an extended Chaplygin gas universe is merged with the braneworld scenario. In particular, we examine the realization of Einstein static un…
Holographic dark energy models with Interactions and entropy corrections for different cutoffs in the Brans-Dicke cosmology
F. Darabi, F. Felegary
In the framework of Brans-Dicke cosmology, we have studied the interacting power-law and logarithmic entropy-corrected holographic dark energy models with different cut-offs. The B…
On the Stability of Einstein Static Universe in Doubly General Relativity Scenario
M. Khodadi, Y. Heydarzade, K. Nozari +1
By presenting a relation between average energy of the ensemble of probe photons and energy density of the Universe, in the context of {\it gravity's rainbow} or {\it doubly genera…
String gravitational equations with Hermitian structure
F. Naderi, A. Rezaei-Aghdam, F. Darabi
We consider a string model at one-loop related to a -model whose antisymmetric tensor field is constructed as complex structure on the background manifold, specially on a manifo…
Einstein static Universe in non-minimal kinetic coupled gravity
K. Atazadeh, F. Darabi
We study the stability of Einstein static Universe, with FLRW metric, by considering linear homogeneous perturbations in the kinetic coupled gravity. By taking linear homogeneous p…
Deformed Horava-Lifshitz Cosmology and Stability of Einstein Static Universe
Y. Heydarzade, M. Khodadi, F. Darabi
Stability of the Einstein static universe versus the linear scalar, vector and tensor perturbations is investigated in the context of deformed Hořava-Lifshitz cosmology inspired by…
Quantum tunneling from generalized dimensional black holes having Noether symmetry
F. Darabi, K. Atazadeh, A. Rezaei-Aghdam
We have studied the Hawking radiation from {\it generalized} rotating and static -dimensional BTZ black holes. In this regard, we have benefited the quantum tunneling approa…
Vector inflation by kinetic coupled gravity
F. Darabi, A. Parsiya
Vector inflation is a newly established model where inflation is driven by non-minimally coupled massive vector fields with a potential term. This model is similar to the model of…
Einstein Static Universe in Braneworld Scenario
K. Atazadeh, Y. Heydarzade, F. Darabi
The stability of Einstein static universe against homogeneous scalar perturbations in the context of braneworld scenario is investigated. The stability regions are obtained in term…