389 citations · 2.4k across the 40 of their papers we have counts for
23 papers · 1 filter
Thermodynamics in Rastall Gravity with Entropy Corrections
Kazuharu Bamba, Abdul Jawad, Salman Rafique +1
We explore the thermodynamic analysis at the apparent horizon in the framework of Rastall theory of gravity. We take different entropies such as the Bakenstein, logarithmic correct…
The arbitrariness of potentials in interacting quintessence models
Nandan Roy, Kazuharu Bamba
We study the interacting quintessence model with two different types of interaction by introducing a general parameterization of the quintessence potentials. The form of the quinte…
`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…