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- Institute for Research in Fundamental SciencesIR9 papers
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5 papers · 1 filter
Group theoretical interpretation of the modified gravity in de Sitter space
Mohsen Dehghani
A frame work has been presented for theoretical interpretation of various modified gravitational models which is based on the group theoretical approach and unitary irreducible rep…
Thermodynamic descriptions of Polytropic gas and its viscous type as the dark energy candidates
H. Moradpour, M. T. Mohammadi Sabet
In this paper, at first, we focus on a FRW universe in which the dark energy candidate satisfies the Polytropic equation of state and study thermodynamics of dark energy. Bearing t…
Dynamic Black Holes in a FRW background: Lemaitre transformations
H. Moradpour, A. Dehghani, M. T. Mohammadi Sabet
Since the conformal transformations of metric do not change its causal structure, we use these transformations to embed the Lemaitre metrics into the FRW background. In our approac…
Strong Gravitational Lensing in a Charged Squashed Kaluza- Klein Gödel Black hole
J. Sadeghi, H. Vaez
In this paper we investigate the strong gravitational lansing in a charged squashed Kaluza-Klein Gödel black hole. The deflection angle is considered by the logarithmic term propos…
Conformally Invariant "Massless" Spin-2 Field in de Sitter Universe
M. Dehghani, S. Rouhani, M. V. Takook +1
''Massless'' spin-2 field equation in de Sitter space, which is invariant under the conformal transformation, has been obtained. The frame work utilized is the symmetric rank-2 ten…