JP Journal of Geometry and Topology

The JP Journal of Geometry and Topology publishes articles in all branches of geometry and topology, with applications to physics. It covers areas such as differential geometry, algebraic topology, and geometric aspects of mathematical physics. Survey articles are also welcome.

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TWO EXAMPLES OF CONFORMALLY OSSERMAN MANIFOLDS

Authors

  • Mouhamadou Aboubekry Boye
  • Mohamed El Boukhary Mame
  • Abdoul Salam Diallo

Keywords:

conformal Jacobi operator, conformally Osserman manifold, Weyl conformal curvature operator

DOI:

https://doi.org/10.17654/0972415X25009

Abstract

Let $\left(M^n, g\right), \quad n \geq 4$ be an $n$-dimensional pseudo-Riemannian manifold whose Jacobi operator associated with the Weyl conformal curvature tensor has constant eigenvalues on the bundle of unit tangent vectors, i.e., a conformally Osserman manifold. In this paper, using arguments from Brozos-Vázquez et al. [6], we construct two examples of conformally Osserman manifolds exhibiting distinct eigenvalue structures.

Received: August 11, 2025
Revised: August 24, 2025
Accepted: September 13, 2025

References

[1] N. Blažić, Conformally Osserman Lorentzian manifolds, Kragujevac J. Math. 28 (2005), 85-96.

[2] N. Blažić and P. Gilkey, Conformally Osserman manifolds and conformally complex space forms, Int. J. Geom. Methods Mod. Phys. 1 (2004), 97-106.

[3] N. Blažić and P. Gilkey, Conformally Osserman Manifolds and Self-duality in Riemannian Geometry, Differential Geometry and its Application, Matfyz Press, Prague, 2005, pp. 15-18.

[4] N. Blažić, P. Gilkey, S. Nikcević and U. Simon, The spectral geometry of the Weyl conformal tensor, Banach Center Publ. 69 (2005), 195-203.

[5] M. A. Boye, A. S. Diallo and M. El B. Mame, An example of conformally Osserman manifold, J. Finsler Geom. Appl. 5(1) (2024), 25-34.

[6] M. Brozos-Vázquez, E. García-Río and R. Vázquez-Lorenzo, Conformal Osserman four-dimensional manifolds whose conformal Jacobi operators have complex eigenvalues, Proc. Royal Society A 462 (2006), 1425-1441.

[7] A. S. Diallo, Examples of conformally 2-nilpotent Osserman manifolds of signature (2, 2), Afr. Diaspora J. Math. 9(1) (2010), 96-103.

[8] A. S. Diallo and M. Hassirou, Examples of Osserman metrics of (3, 3)-signature, J. Math. Sci. Adv. Appl. 7(2) (2011), 95-103.

[9] A. S. Diallo, M. Hassirou and O. T. Issa, Walker Osserman metric of signature (3, 3), Bull. Math. Anal. Appl. 9(4) (2017), 21-30.

[10] E. García-Rio, D. N. Kupeli and R. Vázquez-Lorenzo, Osserman Manifolds in Semi-Riemannian, Lecture Notes in Mathematics 1777, Springer Verlag, Berlin, 2002.

[11] P. Gilkey, Geometric properties of natural operators defined by the Riemann curvature tensor, World Scientific Publishing Co., Inc., River Edge, NJ, 2001.

Published

2025-10-02

Issue

Section

Articles

How to Cite

TWO EXAMPLES OF CONFORMALLY OSSERMAN MANIFOLDS. (2025). JP Journal of Geometry and Topology, 31(2), 91-110. https://doi.org/10.17654/0972415X25009

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