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AN INTRINSIC PROOF OF NUMATA'S THEOREM ON LANDSBERG SPACES

  • Salah Gomaa Elgendi (Department of Mathematics Faculty of Science Islamic University of Madinah, Department of Mathematics Faculty of Science Benha University) ;
  • Amr Soleiman (Department of Mathematics College of Science and Arts - Qurayyat Al Jouf University, Department of Mathematics Faculty of Science Benha University)
  • Received : 2023.05.19
  • Accepted : 2023.09.12
  • Published : 2024.01.01

Abstract

In this paper, we study the unicorn's Landsberg problem from an intrinsic point of view. Precisely, we investigate a coordinate-free proof of Numata's theorem on Landsberg spaces of scalar curvature. In other words, following the pullback approach to Finsler geometry, we prove that all Landsberg spaces of dimension n ≥ 3 of non-zero scalar curvature are Riemannian spaces of constant curvature.

Keywords

References

  1. G. S. Asanov, Finsleroid-Finsler spaces of positive-definite and relativistic types, Rep. Math. Phys. 58 (2006), no. 2, 275-300. https://doi.org/10.1016/S0034-4877(06)80053-4 
  2. D. Bao, On two curvature-driven problems in Riemann-Finsler geometry, in Finsler geometry, Sapporo 2005-in memory of Makoto Matsumoto, 19-71, Adv. Stud. Pure Math., 48, Math. Soc. Japan, Tokyo, 2007. https://doi.org/10.2969/aspm/04810019 
  3. J. Grifone, Structure presque-tangente et connexions. I, Ann. Inst. Fourier (Grenoble) 22 (1972), no. 1, 287-334.  https://doi.org/10.5802/aif.407
  4. M. Matsumoto, On C-reducible Finsler spaces, Tensor (N.S.) 24 (1972), 29-37. 
  5. R. Miron and M. Anastasiei, The Geometry of Lagrange Spaces: Theory and Applications, Fundamental Theories of Physics, 59, Kluwer Acad. Publ., Dordrecht, 1994. https://doi.org/10.1007/978-94-011-0788-4 
  6. S. Numata, On Landsberg spaces of scalar curvature, J. Korean Math. Soc. 12 (1975), no. 2, 97-100. 
  7. Z. Shen, On a class of Landsberg metrics in Finsler geometry, Canad. J. Math. 61 (2009), no. 6, 1357-1374. https://doi.org/10.4153/CJM-2009-064-9 
  8. A. Soleiman, Recurrent Finsler manifolds under projective change, Int. J. Geom. Methods Mod. Phys. 13 (2016), no. 10, 1650126, 10 pp. https://doi.org/10.1142/S0219887816501267 
  9. N. L. Youssef, S. H. Abed, and A. Soleiman, Cartan and Berwald connections in the pullback formalism, Algebras Groups Geom. 25 (2008), no. 4, 363-384. 
  10. N. L. Youssef, S. H. Abed, and A. Soleiman, A global approach to the theory of special Finsler manifolds, J. Math. Kyoto Univ. 48 (2008), no. 4, 857-893. https://doi.org/10.1215/kjm/1250271321 
  11. N. L. Youssef, S. H. Abed, and A. Soleiman, A global approach to the theory of connections in Finsler geometry, Tensor (N.S.) 71 (2009), no. 3, 187-208. 
  12. N. L. Youssef, S. H. Abed, and A. Soleiman, Geometric objects associated with the fundamental connections in Finsler geometry, J. Egyptian Math. Soc. 18 (2010), no. 1, 67-90.