Almost L-structures and nearly-Kaehlerian structures

Abstract

In this thesis, we introduce almost L-structures and nearly-Kaehlerian structures on Weyl spaces to examine curvature properties of Weyl spaces having these structures. We also define Einstein L-Weyl space and we give a necessary and sufficient condition for an Einstein L-Weyl space to be Einstein space. Moreover, we define the generalized Einstein tensor in L-Weyl spaces and express it in terms of almost L-structures. Then, almost complex and almost Kaehlerian structures on Weyl space are defined. We construct almost L-structures and nearly-Kaehlerian structures. We prove the integrability condition of Kaehlerian Weyl space and proved that nearly-Kaehlerian Weyl space is a Kaehlerian-Weyl space if the structure is integrable. In addition, we give some theorems which are used to find out generalized Einstein L-Weyl tensor. In the conclusion, we reveal how all these structures are related with Einstein space. By means of the theorems, we also state the generalized Einstein L-Weyl tensor in the terms of curvature tensor, covariant curvature tensor and tensors which are defined.