753 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Research Institute for Astronomy and Astrophysics of MaraghIR261 papers
- Shahid Beheshti UniversityIR40 papers
- University of WaterlooCA31 papers
- Institute for Research in Fundamental SciencesIR29 papers
- International Center for Relativistic AstrophysicsIT24 papers
- Shahid Bahonar University of KermanIR23 papers
- Canadian Quantum Research CenterCA22 papers
- University of MazandaranIR17 papers
- Shahid Chamran University of AhvazIR12 papers
- Yasouj UniversityIR12 papers
- Helmholtz Institute JenaDE11 papers
- Isfahan University of TechnologyIR9 papers
26 papers · 1 filter
MOND Theory and Thermodynamics of Spacetime
Ahamd Sheykhi, Leila Liravi
Starting from the Modified Newtonian Dynamics (MOND) theory and using an inverse approach, we construct a general form of the entropy expression associated with the horizon based o…
Constraints on Rényi Entropy through Primordial Big-Bang Nucleosynthesis and Baryogenesis
Ahmad Sheykhi, Ava Shahbazi Sooraki
The Rényi entropy, a one-parameter generalization of Boltzmann-Gibbs entropy, offers a promising framework for probing quantum gravitational effects in cosmology. By modifying the…
Three dimensional charged black holes in Gauss-Bonnet gravity
Kimet Jusufi, Mubasher Jamil, Ahmad Sheykhi
By using the zero-point length effect, we construct a new class of charged black hole solutions in the framework of three dimensional Gauss-Bonnet (GB) gravity with Maxwell electro…
New black hole solutions in three-dimensional gravity
G. G. L. Nashed, A. Sheykhi
We construct two new classes of analytical solutions in three-dimensional spacetime and in the framework of gravity. The first class represents a non-rotating black hole (BH…
New explanation for accelerated expansion and flat galactic rotation curves
Ahmad Sheykhi
Employing the non-additive Tsallis entropy, , for the large-scale gravitational systems, we disclose that in the cosmological scales both Friedmann equation and the equa…
Alternative approach to the critical behavior and microscopic structure of the power-Maxwell black holes
Ahmad Sheykhi, Mohammad Arab, Zeinab Dayyani +1
Employing a new approach toward thermodynamic phase space, we investigate the phase transition, critical behavior and microscopic structure of higher dimensional black holes in an…
The structure of hybrid neutron star in Einstein- gravity
T. Yazdizadeh, G. H. Bordbar, B. Eslam Panah
In this paper, we investigate the structure of neutron stars by considering both the effects of the cosmological constant and the existence of quark matter for neutron stars in Ein…
Metamaterials mimic the black holes: the effects of charge and rotation on the optical properties
S. H. Hendi, Z. S. Taghadomi, A. Ghasempour Ardakani
Motivated by investigation of black hole properties in the lab, some interesting subjects such as analogue gravity and transformation optics are generated. In this paper, we look f…
Effects of Anisotropy on the Sign-Changeable Interacting Tsallis Holographic Dark Energy
M. Abdollahi Zadeh, A. Sheykh, H. Moradpour +1
A spatially homogeneous and anisotropic Bianchi type I universe is considered while it is filled by pressureless dark matter (DM) and Tsallis holographic dark energy (DE) interacti…
Tsallis Agegraphic Dark Energy Model
M. Abdollahi Zadeh, A. Sheykhi, H. Moradpour
Using the nonextensive Tsallis entropy and the holographic hypothesis, we propose a new dark energy (DE) model with time scale as infrared (IR) cutoff. Considering the age of the U…
Contraction of cold neutron star due to in the presence a quark core
B. Eslam Panah, T. Yazdizadeh, G. H. Bordbar
Motivated by importance of the existence of quark matter on structure of neutron star. For this purpose, we use a suitable equation of state (EoS) which include three different par…
Weak gravitational interaction of fermions: quantum viewpoint
T. Olyaei, A. Aziziy
Using the quantum theory of linearized gravity, gravitational interaction differential cross sections of one fermion by another fermion, a photon and a scalar particle are calculat…
BTZ dilatonic black holes coupled to Maxwell and Born-Infeld electrodynamics
Seyed Hossein Hendi, Behzad Eslam Panah, Shahram Panahiyan +1
Motivated by string theory corrections of dilatonic gravity and Born-Infeld nonlinear electromagnetic field, we consider the BTZ black holes with these two generalizations. It will…
Implications of the Generalized Entropy Formalisms on the Newtonian Gravity and Dynamics
H. Moradpour, A. Sheykhi, C. Corda +1
Employing the Verlinde's hypothesis, and considering two well-known generalized entropy formalisms, two modifications to the Newtonian gravity are derived. In addition, it has been…
A note on holographic dark energy with varying term
A. Sheykhi, S. Ghaffari, N. Roshanshah
We reconsider the holographic dark energy (HDE) model with a slowly time varying parameter in the energy density, namely , where is the IR cuto…
Relativistic three-partite non-locality
H. Moradpour, A. Montakhab
Bell-like inequalities have been used in order to distinguish non-local quantum pure states by various authors. The behavior of such inequalities under Lorentz transformation has b…
Wormhole solutions in the presence of nonlinear Maxwell field
S. H. Hendi
Generalizing of the Maxwell field to nonlinear electrodynamics theories, we look for the magnetic solutions. In initial approximation these models give the usual linear electrodyna…
Initiating the effective unification of black hole horizon area and entropy quantization with quasi-normal modes
C. Corda, S. H. Hendi, R. Katebi +1
Black hole (BH) quantization may be the key to unlocking a unifying theory of quantum gravity (QG). Surmounting evidence in the field of BH research continues to support a horizon…
Hawking radiation - quasi-normal modes correspondence and effective states for nonextremal Reissner-Nordström black holes
Christian Corda, Seyed Hossein Hendi, Reza Katebi +1
It is known that the nonstrictly thermal character of the Hawking radiation spectrum harmonizes Hawking radiation with black hole (BH) quasi-normal modes (QNM). This paramount issu…
Rotating black strings in -Maxwell theory
S. Salarpour, A. Sheykhi, Y. Bahrampour
In general, the field equations of theory coupled to a matter field are very complicated and hence it is not easy to find exact analytical solutions. However, if one conside…
Thermodynamics of Fractal Universe
Ahmad Sheykhi, Zeinab Teimoori, Bin Wang
We investigate the thermodynamical properties of the apparent horizon in a fractal universe. We find that one can always rewrite the Friedmann equation of the fractal universe in t…
Sounds of instability from generalized QCD ghost dark energy
Esmaeil Ebrahimi, Ahmad Sheykhi
We investigate about the stability of generalized QCD ghost dark energy model against perturbations in the FRW background. For this purpose, we use the squared sound speed …
Einstein Equations and MOND Theory from Debye Entropic Gravity
A. Sheykhi, K. Rezazadeh Sarab
Verlinde's proposal on the entropic origin of gravity is based strongly on the assumption that the equipartition law of energy holds on the holographic screen induced by the mass d…
Lovelock gravity from entropic force
A. Sheykhi, H. Moradpour, N. Riazi
In this paper, we first generalize the formulation of entropic gravity to (n+1)-dimensional spacetime. Then, we propose an entropic origin for Gauss-Bonnet gravity and more general…