Inequalities on Riemannian Warped Product Submersions for Vertical Casorati Curvatures

Mediterranean Journal of Mathematics - Tập 20 - Trang 1-17 - 2023
Irem Küpeli Erken1, Cengizhan Murathan2, Aliya Naaz Siddiqui3
1Department of Mathematics, Faculty of Engineering and Natural Sciences, Bursa Technical University, Bursa, Turkey
2Department of Mathematics, Art and Science Faculty, Bursa Uludag University, Bursa, Turkey
3Division of Mathematics, School of Basic and Applied Sciences, Galgotias University, Greater Noida, India

Tóm tắt

The first and second authors introduced Riemannian warped product submersions and discussed interesting fundamental geometric properties of such submersions in Küpeli Erken and Murathan, Results Math 76(1) (2021), https://doi.org/10.1007/s00025-020-01310-4 . In the present paper, we extend this study to put light on the curvature properties of such submersions and then obtain optimal inequalities for Riemannian warped product submersions involving vertical Casorati curvatures. Also, we discuss under which conditions the equality case of inequality can hold with an example.

Tài liệu tham khảo

Beri, A., Küpeli, E.I., Murathan, C.: Anti invariant Riemannian submersions from Kenmotsu manifolds onto Riemannian manifolds. Turk. J. Math. 40, 540–552 (2016) Bishop, R.L., O’Neill, B.: Manifolds of negative curvature. Trans. Am. Math. Soc. 145, 1–49 (1969) Brubaker, N.D., Suceava, B.D.: A geometric interpretation of Cauchy-Schwarz inequality in terms of Casorati curvature. Int. Electron. J. Geom. 11(1), 48–51 (2018) Casorati, F.: Mesure de la courbure des surfaces suivant l’idee commune, Ses rapports avec les meures de courbure gaussienne et moyenne. Acta Math. 14(1), 95–110 (1890) Chen, B.-Y.: Differential Geometry of Warped Product Manifolds and Submanifolds. World Scientific Publishing CO. Pte. Ltd, Singapore (2017) Chen, B.-Y.: Geometry of warped products as Riemannian submanifolds and related problems. Soochow J. Math. 28(2), 125–156 (2002) Chen, B.-Y.: Some pinching and classification theorems for minimal submanifolds. Arch. Math. 60, 568–578 (1993) Chen, B.-Y.: Recent developments in \(\delta \)-Casorati curvature invariants. Turk. J. Math. 45(1), 1–46 (2021) Decu, S., Haesen, S., Verstraelen, L.: Optimal Inequalities involving Casorati Curvatures. Bull. Transil. Univ. Brasov. Ser. B 14(49), 85–93 (2007) Decu, S., Haesen, S., Verstraelen, L.: Optimal Inequalities characterizing quasi-umbilical submanifolds. J. Inequal. Pure Appl. Math. 9(3), 1–7 (2008) Gray, A.: Pseudo-Riemannian almost product manifolds and submersions. J. Math. Mech. 16, 715–737 (1967) Küpeli Erken, İ., Murathan, C.: Riemannian warped product submersions. Results Math. 76(1) (2021). https://doi.org/10.1007/s00025-020-01310-4 Lee, C.W., Lee, J.W., Sahin, B., Vilcu, G.E.: Optimal inequalities for Riemannian maps and Riemannian submersions involving Casorati curvatures. Ann. Math. 200(3), 1–19 (2020). https://doi.org/10.1007/s10231-020-01037-7 Nölker, S.: Isometric immersions of warped products. Differ. Geom. Appl. 6, 1–30 (1996) O’Neill, B.: The fundamental equations of a submersion. Michigan Math. J. 13, 459–469 (1966) O’Neill, B.: Semi-Riemannian Geometry with Applications to Relativity. Academic Press, New York (1983) Siddiqui, A.N., Siddiqi, M.D., Alkhaldi, A.H., Ali, A.: Lower bounds on statistical submersions with vertical Casorati curvatures. Intern. J. Geom. Meth. Mod. Phys. (2022). https://doi.org/10.1142/S021988782250044X Siddiqui, A.N., Murathan, C., Siddiqi, M.D.: The Chen’s first inequality for submanifolds of statistical warped product manifolds. J. Geom. Phy. 169, 104344 (2021) Siddiqui, A.N., Chen, B.-Y., Siddiqi, M.D.: Chen inequalities for statistical submersions between statistical manifolds. Intern. J. Geom. Methods Mod. PhyS. 18(4), 17 (2021)