@article{article_531036, title={SUBMERSION FROM SEMI-RIEMANNIAN MANIFOLDS ONTO LIGHTLIKE MANIFOLDS}, journal={Hacettepe Journal of Mathematics and Statistics}, pages={41–53}, year={2025}, author={Şahin, Bayram and Gündüzalp, Yılmaz}, keywords={Lightlike Manifold,Submersion,Lightlike submersion}, abstract={In this paper, we introduce the idea of a lightlike submersion from
a semi-Riemannian manifold onto a lightlike manifold, and give some
examples. Then we define O’Neill’s tensors for such submersions and
investigate their main properties. We show that the Schouten connection is not a metric connection in a lightlike submersion. We also investigate curvature properties of the manifolds and establish a relation
between the null sectional curvatures of a semi-Riemannian manifold
and a lightlike manifold. }, number={Advanced Online Publication}, publisher={Hacettepe University}