32 citations · 122 across the 16 of their papers we have counts for
16 papers
A spherically symmetric gravitational solution of nearly conformally flat metric~measure~space
Samaneh Oghbaiee, Nafiseh Rahmanpour, Hossein Shojaie
In this manuscript, we study the nearly flat approximation of a conformally invariant gravitational theory in metric measure space (MMS). In addition, we investigate the transforma…
Asymptotically flat boundary conditions for the model for Euclidean Quantum Gravity
Sepideh Bakhoda, Hossein Shojaie, Thomas Thiemann
A generally covariant gauge theory describing the limit of Euclidean general relativity is an interesting test laboratory for general relativity, specially bec…
Asymptotic conformal symmetry at spatial infinity
Sepideh Bakhoda, Fatemeh Mahdieh, Hossein Shojaie
In this paper, the effects of adding spatial conformal symmetry to the asymptotic symmetry group of an asymptotically conformally flat spacetime are studied. It is shown that, in a…
Large Gauge Symmetries of an Asymptotically de Sitter Horizon: An Extended First Law of Thermodynamics
Fatemeh Mahdieh, Hossein Shojaie
In this paper, we show that a universe with a dynamical cosmological constant approaching pure de Sitter at timelike infinity, enjoys an infinite dimensional symmetry group at its…
Metric Measure Space as a Framework for Gravitation
Nafiseh Rahmanpour, Hossein Shojaie
In this manuscript, we show how conformal invariance can be incorporated in a classical theory of gravitation, in the context of metric measure space. Metric measure space involves…
Generalized Second Law of Thermodynamics with Corrected Entropy in Tachyon Cosmology
H. Farajollahi, A. Ravanpak, H. Shojaie +1
This work is to study the generalized second law (GSL) of thermodynamics in tachyon cosmology where the boundary of the universe is assumed to be enclosed by a dynamical apparent h…
A Conformally Invariant Theory of Gravitation in Metric Measure Space
Nafiseh Rahmanpour, Hossein Shojaie
In this manuscript, a conformally invariant theory of gravitation in the context of metric measure space is studied. The proposed action is invariant under both diffeomorphism and…
An FLRW Cosmology with a Chameleon Field
Amir Pouyan Khosravi Karchi, Hossein Shojaie
In this manuscript, the field equations of a chameleon field in which the matter Lagrangian term is a general function of the scalar field as well as matter field, are derived. The…
Pioneer Anomaly in Perturbed FRW Metric
Hossein Shojaie
In this manuscript, it is shown that the Pioneer anomaly is the local evidence for an expanding universe. In other words, its value is a direct measure of the Hubble constant while…
Chameleonic Generalized Brans--Dicke model and late-time acceleration
H. Farajollahi, M. Farhoudi, A. Salehi +1
In this paper we consider Chameleonic Generalized Brans--Dicke Cosmology in the framework of FRW universes. The bouncing solution and phantom crossing is investigated for the model…
On Dynamics of Brans--Dicke Theory of Gravitation
Hossein Farajollahi, Mehrdad Farhoudi, Hossein Shojaie
We study longstanding problem of cosmological clock in the context of Brans-Dicke theory of gravitation. We present the Hamiltonian formulation of the theory for a class of spatial…
FRW Cosmology From Five Dimensional Vacuum Brans-Dicke Theory
Amir F. Bahrehbakhsh, Mehrdad Farhoudi, Hossein Shojaie
We follow approach of induced matter theory for 5D vacuum BD, introduce induced matter and potential in 4D hypersurfaces, and employ generalized FRW type solution. We confine ourse…
The Variable-c Cosmology as a Solution to Pioneer Anomaly
Hossein Shojaie
It is shown that the Pioneer anomaly is a natural consequence of variable speed of light cosmological models wherein the speed of light is assumed to be a power-law function of the…
A cosmology with variable c
Hossein Shojaie, Mehrdad Farhoudi
A new varying- cosmological model constructed using two additional assumptions, which was introduced in our previous work, is briefly reviewed and the dynamic equation of the mo…
A varying-c cosmology
Hossein Shojaie, Mehrdad Farhoudi
We develop a new model for the Universe based on two key assumptions: first, the inertial energy of the Universe is a constant, and second, the total energy of a particle, the iner…
Black holes in the varying speed of light theory
H. Shojaie, M. Farhoudi
We consider the effect of the \emph{Varying Speed of Light} theory on non-rotating black holes. We show that in any varying- theory, the Schwarzschild solution is neither static…