On the Geometry of Some (α, β)-Metrics on the Nilpotent Groups H(p, r)

In this paper we study the Riemann-Finsler geometry of the Lie groups H(p, r) which are a generalization of the Heisenberg Lie groups. For a certain Riemannian metric h·, ·i, the Levi-Civita connection and the sectional curvature are given. We classify all left invariant Randers metrics of Douglas type induced by h·, ·i, compute their flag curvatures and show that all of them are nonBerwaldian.

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  • [1] An H. and Deng S.,, Invariant (α, β)-metrics on homogeneous manifolds. Monatsh. Math. 154 (2008), 89-102.
  • [2] Asanov G.S., Finsler Geometry, Relativity and Gauge Theories. D. Reidel Pubishing Company, Dordrecht, Holland, 1985.
  • [3] Bacso S. and Matsumoto M., On Finsler spaces of Douglas type. A generalization of the notion of Berwald space. Publ. Math. Debrecen 51 (1997), 385-406.
  • [4] Bao D., Chern S. S. and Shen Z., An Introduction to Riemann-Finsler Geometry. Springer, 2000.
  • [5] Chern S. S. and Shen Z., Riemann-Finsler Geometry. World Scientific, Singapore, 2005.
  • [6] Deng S., Homogeneous Finsler Spaces. Springer, New York, 2012.
  • [7] Deng S., Hosseini M., Liu H. and Salimi Moghaddam H. R., On the left invariant (α, β)-metrics on some Lie groups. Houston J. Math. to appear.
  • [8] Deng S. and Hu Z., On Flag Curvature of Homogeneous Randers Spaces. Canad. J. Math. 65 (2013), no. 1, 66-81.
  • [9] Goze M. and Haraguchi Y., Sur les r-systemes de contact. C. R. Acad. Sci. Paris Ser. I Math. 294 (1982), 95-97.
  • [10] Piu P. and Goze M., On the Riemannian geometry of the nilpotent groups H(p, r (1993), 611-619.