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Article . 2001
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image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
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On some second order properties of torse forming vector fields

Authors: CARFI', David;

On some second order properties of torse forming vector fields

Abstract

Summary: If \(dp\) denotes the soldering form of a differentiable \(C^\infty\) manifold (i.e. the canonical vector valued 1-form) and \(\nabla\) the covariant differential operators, then a TF may be defined as \[ \nabla{\mathcal T}=sdp+\omega{\mathcal T},\quad s\in \Lambda^0M \] where \(\omega\in\Lambda^1M\) is the associated Pfaffian with \(\mathcal T\). It is shown that if the a vector field \(W= \omega^\sharp\) of a torse forming vector field (TF) is a skew symmetric Killing vector field, then the TF is an exterior concurrent vector field. Further the existence of an horizontal TF on a Kenmotsu manifold (\(\omega K\)-manifold) \(M (\varphi, \Omega, \eta,\xi,g)\) [\textit{I. Mihai, R. Rosca} and \textit{L. Verstraelen}, Some aspects of the differential geometry of vector fields, Kath. Univ. Leuven, Kath. Univ. Brussels, Padge 2 (1996; Zbl 0960.53019)] is proved by considering a closed differential system. If \({\mathcal T}_1\) and \({\mathcal T}_2\) are two such TF having both the same structure 1-form \(\eta\) as associated Pfaffian, it is proved that \(M\) is foliated by surfaces tangent to \({\mathcal T}_1\) and \({\mathcal T}_2\). Other properties of torse forming vector fields are also discussed.

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Italy
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Keywords

torse forming vector field, soldering form, Special Riemannian manifolds (Einstein, Sasakian, etc.), foliation, Killing vector field, soldering form, torse forming vector field, Kenmotsu manifold, concurrent vector field, foliation., concurrent vector field, Kenmotsu manifold, Killing vector field

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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