INTRODUCTION

In differential geometry, CR-submanifolds have been a hotspot for study for the past four decades. In 1978, A. Bejancu introduced the notion of CR-submanifolds of a Kaehler manifold, which extends to complex and real submanifolds alike. In this paper, A. Bejancu explored many geometry issues related to CR submanifolds. Contact CR-submanifolds in Kenmotsu manifolds were subsequently the subject of study by Atceken et al., who uncovered some intriguing features.

Professor D. E. Blair first proposed the idea of a Killing tensor field in 1971. Many writers have studied the class of almost contact manifolds first studied by K. Kenmotsu in 1972, which is called a Kenmotsu manifold (Ratiu, T. 2008).

One specific kind of almost contact metric manifold is called a Kenmotsu manifold, and it is defined by the fact that (∇𝑋𝜙)=−𝑔(𝜙𝑋,𝑌)𝜉+𝜂(𝑌)𝜙𝑋, This stands for the Levi-Civita relationship of 𝑏. Because of its unique geometric features, the Kenmotsu manifold is a great place to explore Contact CR-submanifolds and other submanifold structures. The existence of a CR (Cauchy-Riemann) structure, a naturally occurring extension of the complex structure in the theory of multiple complex variables to the context of nearly contact metric manifolds, defines these submanifolds. In particular, the splitting of the tangent bundle 𝑇𝑁 into two orthogonal subbundles defines a Contact CR-submanifold 𝑁 of an almost contact metric manifold 𝑀 𝐷=𝑇𝑁∩ker(𝜂) alongside the range of The subbundle 𝐷 remains unchanged when 𝜙 is applied. Meaning (𝐷)⊆𝐷 (Biswas, 2014). Additionally, 𝐷 divides into 𝐷=𝐷1⊕𝐷2, where 𝐷1 represents a complicated subbundle of 𝐷 (i.e., (𝐷1)=𝐷1and 𝐷2 it is orthogonal to in 𝐷 (i.e., 𝜙(𝐷2)⊆𝐷1. The duality and interplay of the holomorphic and fully real components of the submanifold's geometry are mirrored by this splitting. (Ojha, R. H. 2011)

PRELIMINARIES

 

CONTACT CR-SUBMANIFOLD OF A KENMOTSU MANIFOLD WITH KILLING TENSOR FIELD

 

CONCLUSION

The impact of curves and metal structures on manifold properties show their inherent and extrinsic qualities. Geodesics and curvature routes help us grasp the manifold's topology and geometry, including its singularities and curvature behaviour. Metal structures, commonly modelled using differential forms and tensor fields, provide stiffness and elasticity to the manifold, enriching this research. These structures affect manifold stability, deformation, and external force response. This interaction between curves and metal structures affects theoretical mathematics and material science and engineering. It shows how to alter and regulate complicated geometrical characteristics, improving material and structure design for desired mechanical and physical attributes. This extensive study highlights the manifold's features' dependence on curves and metal structures, opening new scientific and technological opportunities.