Ricci solitons in Sasakian manifold
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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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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
Effective Gravitational “Constant” in Scalar-(Curvature)Tensor and Scalar-Torsion Gravities
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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