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   Articles with "curvature tensor" as a keyword



Ricci solitons in Sasakian manifold

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recommendations! Published in 2017 at "Afrika Matematika"

DOI: 10.1007/s13370-017-0502-z

Abstract: Recently the present author introduced the notion of generalized quasi-conformal curvature tensor which bridges conformal curvature tensor, concircular curvature tensor, projective curvature tensor and conharmonic curvature tensor. The object of the present paper is to… read more here.

Keywords: ricci solitons; solitons sasakian; sasakian manifold; curvature tensor ... See more keywords

Perfect fluid spacetimes with harmonic generalized curvature tensor

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recommendations! Published in 2019 at "Osaka Journal of Mathematics"

DOI: 10.18910/71142

Abstract: We show that n-dimensional perfect fluid spacetimes with divergence-free conformal curvature tensor and constant scalar curvature are generalized Robertson Walker (GRW) spacetimes; as a consequence a perfect fluid Yang pure space is a GRW spacetime.… read more here.

Keywords: perfect fluid; curvature tensor; fluid spacetimes; curvature ... See more keywords

Concircular curvature tensor of nearly cosymplectic manifolds in terms of the generalized Tanaka-Webster connection

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recommendations! Published in 2024 at "Filomat"

DOI: 10.2298/fil2409011a

Abstract: In this paper, we study concircular curvature tensor of nearly cosymplectic manifolds in terms of the generalized Tanaka-Webster connection and then, we emphasized the properties that concircular curvature tensor of nearly cosymplectic manifolds in terms… read more here.

Keywords: nearly cosymplectic; cosymplectic manifolds; tensor nearly; curvature tensor ... See more keywords

Effective Gravitational “Constant” in Scalar-(Curvature)Tensor and Scalar-Torsion Gravities

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recommendations! Published in 2017 at "Universe"

DOI: 10.3390/universe3020037

Abstract: In theories where a scalar field couples nonminimally to gravity, the effective gravitational “constant” becomes dependent on the value of the scalar field. This note first gives a brief review on how the cosmological evolution… read more here.

Keywords: tensor scalar; gravitational constant; tensor; effective gravitational ... See more keywords