225 citations · 980 across the 23 of their papers we have counts for
21 papers · 1 filter
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…
Entropic considerations on the Universe and Universe-Black Hole Systems
H. Hadi, F. Darabi, Y. Heydarzade
We study the entropic considerations on the Universe system and the Universe-Black hole system, filled by cosmological constant or exotic quintessence-like and phantom-like fields…
D-bound and Bekenstein Bound for the Surrounded Vaidya Black Hole
H. Hadi, F. Darabi, K. Atazadeh +1
We study the Vaidya black hole surrounded by the exotic quintessence-like, phantom-like and cosmological constant-like fields by means of entropic considerations. Explicitly, we sh…
Surrounded Vaidya black holes: apparent horizon properties
Y. Heydarzade, F. Darabi
We study the thermodynamical features and dynamical evolutions of various apparent horizons associated with the Vaidya evaporating black hole surrounded by the cosmological fields…
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…
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…
Surrounded Vaidya Solution by Cosmological Fields
Y. Heydarzade, F. Darabi
In the present work, we study the general surrounded Vaidya solution by the various cosmological fields and its nature describing the possibility of the formation of naked singular…
Vaidya Spacetime in Massive Gravity's Rainbow
Yaghoub Heydarzade, Prabir Rudra, Farhad Darabi +2
In this paper, we will analyze the energy dependent deformation of massive gravity using the formalism of massive gravity's rainbow. So, we will use the Vainshtein mechanism and th…
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…
Black Hole Solutions Surrounded by Perfect Fluid in Rastall Theory
Y. Heydarzade, F. Darabi
In this work, we obtain uncharged\charged Kiselev-like black holes as a new class of black hole solutions surrounded by perfect fluid in the context of Rastall theory. Then, we stu…
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…
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…
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…
Emergent Universe in the Braneworld Scenario
Y. Heydarzade, H. Hadi, F. Darabi +1
According to Padmanabhan's proposal, the difference between the surface degrees of freedom and the bulk degrees of freedom in a region of space may result in the acceleration of Un…
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…
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…
Phantom Wormhole Solutions in a Generic Cosmological Constant Background
Y. Heydarzade, N. Riazi, H. Moradpour
There are a number of reasons to study wormholes with generic cosmological constant . Recent observations indicate that present accelerating expansion of the universe demands $Λ…
Stability of Einstein Static Universe over Lyra Geometry
F. Darabi, Y. Heydarzade, F. Hajkarim
The existence and stability conditions of Einstein static universe against homogeneous scalar perturbations in the context of Lyra geometry is investigated. The stability condition…
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…