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On the Ricci Curvature of Normal-Metric Contact Pair Manifolds

open access: yesJournal of New Theory, 2021
In this study, we work on normal-metric contact pair manifolds under certain conditions related to the Ricci curvature. We obtain some results for generalized quasi-Einstein normal-metric contact pair manifolds.
Ramazan Sarı, İnan Ünal
doaj  

Closed time-like curves in f(R,A) modified gravity theory

open access: yesNuclear Physics B
In this manuscript, we investigate solutions that allow closed time-like curves (CTCs) in general relativity (GR) within the framework of a modified gravity theory. We consider here an alternative theory recently proposed in gravity theories known as f(R,
F. Ahmed, J.C.R. de Souza, A.F. Santos
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