Weak Nearly $\mathcal S$- and Weak Nearly $\mathcal C$- Manifolds

TL;DR

This paper introduces and studies weak nearly S- and C- structures on manifolds, exploring their geometric properties, relations to Killing vector fields, and submanifold characterizations within weak nearly Kähler manifolds.

Contribution

It defines weak nearly S- and C- structures, analyzes their geometry, and characterizes related submanifolds, expanding the understanding of weak metric f-structures.

Findings

Relations to Killing vector fields established

Characterization of submanifolds in weak nearly Kähler manifolds

New perspective on classical structures through weak metric f-structures

Abstract

The recent interest of geometers in the $f$-structures of K. Yano is motivated by the study of the dynamics of contact foliations, as well as their applications in theoretical physics. Weak metric $f$-structures on a smooth manifold, recently introduced by the author and R. Wolak, open a new perspective on the theory of classical structures. In the paper, we define structures of this kind, called weak nearly ${\cal S}$- and weak nearly ${\cal C}$- structures, study their geometry, e.g. their relations to Killing vector fields, and characterize weak nearly ${\cal S}$- and weak nearly ${\cal S}$- submanifolds in a weak nearly K\"{a}hler manifold.