389 citations · 3.1k across the 116 of their papers we have counts for
17 papers · 2 filters
`Hidden' symmetry of linearized gravity in de Sitter space
Hamed Pejhan, Surena Rahbardehghan, Mohammad Enayati +2
We demonstrate that the linearized Einstein gravity in de Sitter (dS) spacetime besides the evident symmetries also possesses the additional (local) symmetry $h_{μν}\rightarrow h_{…
Traversable Wormholes with Exponential Shape Function in Modified Gravity and in General Relativity: A Comparative Study
Gauranga C. Samanta, Nisha Godani, Kazuharu Bamba
We have proposed a novel shape function on which the metric that models traversable wormholes is dependent. Using this shape function, the energy conditions, equation of state and…
Nonlinear electrodynamics, singularities and accelerated expansion
Gauranga C. Samanta, Shantanu K. Biswal, Kazuharu Bamba
Non-linear electrodynamics coupled to general relativity is investigated. In general relativity, it is observed that the expansion of the universe is accelerating if the source of…
A small non-vanishing cosmological constant from the Krein-Gupta-Bleuler vacuum
Hamed Pejhan, Kazuharu Bamba, Mohammad Enayati +1
We point out a potential relevance between the Krein-Gupta-Bleuler (KGB) vacuum leading to a fully covariant quantum field theory for gravity in de Sitter (dS) spacetime and the ob…
Reconstruction of lagrangian from a massive scalar field
Soumya Chakrabarti, Kazuharu Bamba, Jackson Levi Said
We present a reconstruction of the Lagrangian for gravity by using a massive scalar field. The scalar field is minimally coupled to the action of gravity. We demonstr…
Charged rotating black holes coupled with nonlinear electrodynamics Maxwell field in the mimetic gravity
G. G. L. Nashed, W. El Hanafy, Kazuharu Bamba
In mimetic gravity, we derive -dimension charged black hole solutions having flat or cylindrical horizons with zero curvature boundary. The asymptotic behaviours of these black…