D-homothetically fixed, weakly $(\kappa ,\mu )$-structures on contact metric spaces

Abstract

Contact metric $(\kappa ,\mu )$-spaces are generalizations of Sasakian spaces. We introduce a weak $(\kappa ,\mu )$ condition as a generalization of the K-contact one and show that many of the known results from generalized Sasakian geometry hold in the weaker generalized K-contact geometry setting. In particular, we prove existence of K-contact and $(\kappa ,\mu =2)$-structures under some conditions on the Boeckx invariant.