arXiv subjects

Vincenzo Saltarelli

Publications and source records attributed to Vincenzo Saltarelli.

2 recordsLinked to original sources

arXiv2013

Three-dimensional almost Kenmotsu manifolds satisfying certain nullity conditions

We investigate 3-dimensional almost Kenmotsu manifolds satisfying special types of nullity conditions depending on two smooth functions $κ,μ$. When either $κ<-1$ and $μ=0$ or $h=0$, such conditions coincide with the $κ$-nullity condition which we show to be equivalent to the $η$-Einstein one. As an application of this result, we obtain examples of $N(κ)$-quasi Einstein manifolds. Moreover, for the aforementioned manifolds, some complete local descriptions of their structure are established, building local "models" for each of them.

math.DG↗

arXiv2010

Semi-invariant $ξ^{\bot}$-submanifolds of generalized quasi-Sasakian manifolds

A structure on an almost contact metric manifold is defined as a generalization of well-known cases: Sasakian, quasi-Sasakian, Kenmotsu and cosymplectic. Then we consider a semi-invariant $ξ^{\bot}$-submanifold of a manifold endowed with such a structure and two topics are studied: the integrability of distributions defined by this submanifold and characterizations for the totally umbilical case. In particular we recover results of Kenmotsu, Eum and Papaghiuc.

math.DG↗