Ricci inverse anisotropic stellar structures

Shamir, M. Farasat; Ahmad, M.; Mustafa, G.; Rashid, Aisha

doi:10.1016/j.cjph.2022.11.011

Cited by 21 publications

(2 citation statements)

References 64 publications

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“…The evolutionary eras, i.e., acceleration to deceleration have been discussed further in the inverse gravity regime. Shamir and his mates [68] explored the anisotropic relativistic solutions for the Ricci inverse gravity. They showed the stability of the assumed inverse formation and is remained away from the singularity at the center.…”

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confidence: 99%

Matter bounce scenario in matter geometry coupled theory

Suzuki,

Almutairi,

Aman

2023

Phys. Scr.

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This paper studies the cosmographic and matter bounce scenario in modified theory. The corresponding field equations are evaluated after considering special corrections of a Hubble parameter. The linear corrections to the Gauss-Bonnet gravity are being taken to analyze the behavior of Hubble and deceleration parameters. We derive dynamical parameters in a very general way to analyze different energy conditions that would lead to understanding the behavior of the equation of state parameters in cosmography. Finally, the removal of the initial singularity is observed to understand the late-time cosmic acceleration.

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Section: = -mentioning

confidence: 99%

Matter bounce scenario in matter geometry coupled theory

Suzuki,

Almutairi,

Aman

2023

Phys. Scr.

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“…In another study [15], the necessity of modified gravity theories was thoroughly discussed and compared with the standard GR theory. Recently, there has been a surge of interest in investigating this RI gravity theory across various physical scenarios, as documented in the literature [16][17][18][19][20][21][22][23][24][25][26][27][28]. These investigations underscore the growing relevance and applicability of RI gravity in diverse contexts.…”

Section: Introductionmentioning

confidence: 99%

On causality violation in different classes of Ricci inverse gravity

de Souza,

Santos,

Ahmed

2024

Eur. Phys. J. C

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In this paper, we investigate a causality-violating four-dimensional space-time, an extension of the two-dimensional Misner space within the framework of modified gravity theories, specifically in the context of Ricci-inverse gravity. To explore this, we focus on two classes of models denoted as $$f({\mathcal {R}}, A^{\mu \nu }\,A_{\mu \nu })$$ f ( R , A μ ν A μ ν ) and $$f({\mathcal {R}}, {\mathcal {A}}, A^{\mu \nu }\,A_{\mu \nu })$$ f ( R , A , A μ ν A μ ν ) , and derive the modified field equations using the four-dimensional space-time under consideration. Here, $$A^{\mu \nu }$$ A μ ν is the anti-curvature tensor defined by inverse of the Ricci tensor $$R_{\mu \nu }$$ R μ ν , that is, $$A^{\mu \nu }=R^{-1}_{\mu \nu }$$ A μ ν = R μ ν - 1 . Additionally, $${\mathcal {A}}$$ A denotes its scalar, defined as $${\mathcal {A}}=g_{\mu \nu }\,A^{\mu \nu }$$ A = g μ ν A μ ν . Our analysis shows that in both models, the modified field equations can be solved by considering the matter energy content as a pure radiation field including the cosmological constant. Furthermore, we demonstrate that the energy density of the pure radiation field and the cosmological constant undergo modifications due to the coupling parameters, and these modifications converge to the results of general relativity when these parameters are set to zero. This observation confirms the possibility of causality violation in the form of closed time-like curves within the framework of Ricci-inverse gravity theory.

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New Embedded Wormhole Solutions in Ricci Inverse Gravity

Mustafa,

Javed,

Maurya

et al. 2024

Annalen der Physik

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In this work, two new embedded WH solutions are obtained by using the Class‐I approach in the background of newly fourth‐order Ricci inverse gravity. It is shown that the combination of these newly calculated shape functions and Ricci inverse gravity provides us with the possibility of obtaining traversable wormholes. All the required wormhole properties are discussed, along with flaring out and flatness conditions. The embedded diagrams within the scope of upper and lower universes are provided under the effect of both newly calculated embedded shape functions. All the energy conditions are explored with valid and negative regions. The presence of exotic matter is confirmed due to the negative region in all the energy conditions, specifically in the null energy condition. The Doppler effect through the red‐blue shifts function is also discussed. Several key findings from the current research are described that demonstrate the validity of these wormhole solutions in Ricci inverse gravity.

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Ricci inverse anisotropic stellar structures

Cited by 21 publications

References 64 publications

Matter bounce scenario in matter geometry coupled theory

Matter bounce scenario in matter geometry coupled theory

On causality violation in different classes of Ricci inverse gravity

New Embedded Wormhole Solutions in Ricci Inverse Gravity

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