275 citations · 1.2k across the 27 of their papers we have counts for
25 papers · 1 filter
Quintaverse-Phantiverse Cosmologies in Gravity: a Non-coincident Geometrical Origin of Cosmic Acceleration
Hamid Shabani, Avik De
We investigate the asymptotic dark energy sectors of a quadratic form of Lagrangian. We reformulate the original equations of motion to obtain the equivalent dynamical sys…
The cosmic consequences and the constraints on HN-gravity
J. K. Singh, Sonal Aggarwal, Shaily +2
In this paper, we investigate the latetime cosmic acceleration of the Quintessence model within the framework of Hoyle Narlikar Gravity (HNG), which incorporates a creation field.…
Cosmological Scenarios in gravity with a dynamical degree of freedom
Hamid Shabani, Avik De
The theory, which extends symmetric teleparallel gravity by including the boundary term in addition to the non-metricity scalar , provides a unifying framework that…
Emergent Universe in f(Q) gravity theories
Hamid Shabani, Avik De, Tee-How Loo
One resolution of the ancient cosmic singularity, i.e., the Big Bang Singularity (BBS), is to assume an inflationary stage preceded by a long enough static state in which the unive…
The cosmological significance of boundary term in non-metricity gravity
Hamid Shabani, Avik De, Tee-How Loo
Within the context of metric-affine gravity, we examine the significance of the boundary term in symmetric teleparallel gravity by employing the cosmological dynamical system analy…
Late time cosmological solutions in gravity in a viscous Universe
Hamid Shabani, Norman Cruz, Amir Hadi Ziaie
Considering the condition on conservation of energy momentum tensor (EMT), we study late time cosmological solutions in the context of gravity (where and …
Cosmology of gravity in non-flat Universe
Hamid Shabani, Avik De, Tee-How Loo +1
We investigate the cosmological implications of gravity, which is a modified theory of gravity based on non-metricity, in non-flat geometry. We perform a detailed dynamical-…
A non-singular bouncing cosmology in gravity
J. K. Singh, Shaily, Akanksha Singh +2
We investigate a bounce realization in the framework of higher order curvature in modified theory of gravity. We perform a detailed analysis of the cosmological paramete…
Phase-space analysis of a novel cosmological model in theory
Hamid Shabani, Avik De, Tee-How Loo
The vanishing affine connections have been used solely while adopting the modified gravity theory to the cosmology. Consequently, researchers could not get beyond what is al…
Einstein Static Universe and its Stability in Generalized Rastall Gravity
Hamid Shabani, Amir Hadi Ziaie, Hooman Moradpour
The Einstein static (ES) state is a good candidate for describing the very early universe in terms of a regular cosmological model in which the Big Bang singularity is avoided. In…
The galaxy rotation curves in the modified gravity formalism
H. Shabani, P. H. R. S. Moraes
Astronomical data have shown that the galaxy rotation curves are mostly flat in the far distance of the galactic cores, which reveals the insufficiency of our knowledges about how…
A dynamical system representation of generalized Rastall gravity
Hamid Shabani, Hooman Moradpour, Amir Hadi Ziaie
In this work we study the phase-space analysis of generalized Rastall gravity (GRG) which has recently been introduced as a modification to the original version of Rastall gravity…
Non-minimal coupling inspires the Dirac cosmological model
Hooman Moradpour, Hamid Shabani, Amir Hadi Ziaie +1
In the framework of the generalized Rastall theory (GRT), we study the ability of a non-minimal coupling between geometry and matter fields in order to provide a setting which allo…
A connection between Rastall-type and f(R, T) gravities
Hamid Shabani, Amir Hadi Ziaie
Recently a Lagrangian formulation for Rastall Gravity (RG) has been proposed in the framework of f(R, T) gravity. In the present work we obtain Lagrangian formulation for the stand…
Cosmological aspects of a hyperbolic solution in gravity
Ritika Nagpal, J. K. Singh, A. Beesham +1
This article deals with a cosmological scenario in gravity for a flat FLRW model of the universe. We consider the function as which starts with…
Static Vacuum Solutions on Curved Spacetimes with Torsion
Hamid Shabani, Amir Hadi Ziaie
The Einstein-Cartan-Kibble-Sciama ({\sf ECKS}) theory of gravity naturally extends Einstein\rq{}s general relativity ({\sf GR}) to include intrinsic angular momentum (spin) of matt…
Bouncing cosmological solutions from f(R,T) gravity
Hamid Shabani, Amir Hadi Ziaie
In this work we study classical bouncing solutions in the context of gravity in a flat {\sf FLRW} background using a perfect fluid as the on…
Interpretation of gravity in terms of a conserved effective fluid
Hamid Shabani, Amir Hadi Ziaie
In the present work we introduce a novel approach to study gravity theory from a different perspective. Here, denotes the trace of energy-momentum te…
Late-time cosmological evolution of a general class of f(R, T) gravity with minimal curvature-matter coupling
Hamid Shabani, Amir Hadi ziaie
In this work, we study the late-time cosmological solutions of f(R,T)=g(R)+h(-T) models assuming that the conservation of the energy-momentum tensor (EMT) is violated. We perform o…
Consequences of energy conservation violation: Late time solutions of subclass of gravity using dynamical system approach
Hamid Shabani, Amir Hadi Ziaie
Very recently, the authors of [PRL {\bf 118} (2017) 021102] have shown that violation of energy-momentum tensor (EMT) could result in an accelerated expansion state via appearing a…
Stability of the Einstein static Universe in gravity
Hamid Shabani, Amir Hadi Ziaie
The Einstein static (ES) universe has played a major role in various emergent scenarios recently proposed in order to cure the problem of initial singularity of the standard model…
Cosmological consequences and statefinder diagnosis of a non-interacting generalized Chaplygin gas in gravity
Hamid Shabani
In this paper, we investigate cosmological consequences of a scenario for recently reported accelerated expansion of the Universe, in which the generalized Chaplygin gas (GCG) alon…
Cosmological and Solar System Consequences of f(R,T) Gravity Models
Hamid Shabani, Mehrdad Farhoudi
To find more deliberate f(R,T) cosmological solutions, we proceed our previous paper further by studying some new aspects of the considered models via investigation of some new cos…
On Exact Anisotropic Solutions of Kasner type in Higher Order Gravities
Hamid Shabani
This thesis has considered the existence of anisotropic exact vacuum solutions in the context of higher order gravities. The investigated models generally are a function of three s…