The f (R) gravity theories provide an alternative way to explain the current cosmic
acceleration without a dark energy matter component. If gravity is governed by af (R) theory …

In this paper, we study Noether gauge symmetries of geodesic motion for geodesic
Lagrangian of four classes of metrics of Gödel-type spacetimes for which we calculated the …

In the attempts toward a quantum gravity theory, general relativity faces a serious difficulty
since it is non-renormalizable theory. Hořava–Lifshitz gravity offers a framework to …

Conformal matter collineations of the energy–momentum tensor of a general spherically
symmetric static spacetime are studied. The general form of these collineations is found …

We consider the four-dimensional oscillator group, equipped with a well known one-
parameter family of left-invariant Lorentzian metrics. We obtain a full classification of its Ricci …

In this paper, we consider the homogeneous Gödel-type spacetimes and we completely
classify the Ricci bi-conformal vector fields on these spaces. Also, we show that all Ricci bi …

Totally geodesic and parallel hypersurfaces of Gödel-type spacetimes - ScienceDirect Skip to
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In this paper, we investigate Ricci Inheritance Collineations (RICs) in Kantowski–Sachs
spacetimes. RICs are discussed in detail when Ricci tensor is degenerate and …

In this paper we classify static plane symmetric space–times according to their matter
collineations. These have been studied for both cases when the energy–momentum tensor …

In this paper we classified the matter collineations (MCs) of Bianchi type II spacetime
according to the degenerate and non-degenerate energy-momentum tensor. It is shown that …