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ON REDUCED ALMOST GEODESIC MAPPINGS IN RIEMANNIAN SPACES

On reduced almost geodesic mappings in Riemannian spaces
Authors: Adam Adamów;

ON REDUCED ALMOST GEODESIC MAPPINGS IN RIEMANNIAN SPACES

Abstract

A Riemannian space \(V_ n\) is said to admit an almost geodesic mapping of type \(\pi_ 2\) onto \(\bar V_ n\) (N. S. Sinyukov), if there exist tensor fields \(\phi_ i,\psi_ i,\sigma_ i,\nu_ i\) and \(U^ k_ i\) satisfying the conditions: \({\bar\Gamma }{}^ h_{ij}=\Gamma^ k_{ij}+\phi_{(i}\delta^ k_{j)}+\psi_{(i}U^ k_{j)}\), \(U^ k_{(i,j)}+\psi_{(i}U^ n_{j)}U^ h_ r= \delta_{(i}\delta^ k_{j)}+\nu_{(i}U^ k_{j)}\), where the notations are chosen in the usual manner. This mapping is said to be reduced (V. S. Sobchuk), if the following relations are satisfied \(U^ r_ iU^ h_ r=\epsilon\delta^ h_ i\); \(\epsilon =\pm 1\); \(\psi_{i,j}=U_{ij}+\psi_{(i}U^ r_{j)}\phi_ r\), where \(\phi_ i=\phi_{,i},\psi_ i=\psi_{,i}\) and \(U_{ij}=g_{ir}U^ r_ j\). The author proves the following theorem: Let \(V_ n (n>2)\) admit a reduced almost geodesic mapping onto a semisymmetric Riemannian space \(\bar V_ n\). Suppose, moreover, that the function a-\(n\epsilon\) does not vanish identically, where \(a=a_{ij}g^{ij}\) and \(a_{ij}=\phi_{i,j}-\phi_ i\phi_ j-\phi_ rU^ r_{(i}\psi_{j)}+\epsilon\psi_ i\psi_ j\), then \(\bar V_ n\) is of constant curvature and \(V_ n\) is locally symmetric. This theorem generalizes results of V. S. Sobchuk when \(V_ n\) is locally symmetric.

Keywords

Local Riemannian geometry, semisymmetric Riemannian space, reduced almost geodesic mapping, almost geodesic mapping, constant curvature

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citations
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!
5
Average
Top 10%
Average
gold