DOI QR코드

DOI QR Code

A Class of Lorentzian α-Sasakian Manifolds

  • Yildiz, Ahmet (Art and Science Faculty, Department of Mathematics, Dumlupnar University) ;
  • Turan, Mine (Art and Science Faculty, Department of Mathematics, Dumlupnar University) ;
  • Murathan, Cengizhan (Art and Science Faculty, Department of Mathematics, Uludag University)
  • Received : 2007.07.23
  • Accepted : 2009.01.09
  • Published : 2009.12.31

Abstract

In this study we consider ${\varphi}$-conformally flat, ${\varphi}$-conharmonically flat, ${\varphi}$-projectively at and ${\varphi}$-concircularly flat Lorentzian ${\alpha}$-Sasakian manifolds. In all cases, we get the manifold will be an ${\eta}$-Einstein manifold.

Keywords

References

  1. Arslan K., Murathan C. and Ozgur C., On ${\varphi}$- Conformally flat contact metric manifolds, Balkan J. Geom. Appl. (BJGA), 5(2)(2000), 1-7.
  2. Blair D. E., Contact manifolds in Riemannian geometry, Lectures Notes in Mathematics, Springer-Verlag, Berlin, 509(1976), 146.
  3. Blair D. E. and Oubina J. A., Conformal and related changes of metric on the product of two almost contact metric manifolds, Publications Matematiques, 34(1990), 199-207. https://doi.org/10.5565/PUBLMAT_34190_15
  4. Cabrerizo J.L., Fernandez L.M., Fernandez M. and Zhen G., The structure of a class of K-contact manifolds, Acta Math., Hungar, 82(4)(1999), 331-340. https://doi.org/10.1023/A:1006696410826
  5. Chaki M. C., and Gupta B., On Conformally Symmetric Spaces, Indian J. Math., 5(1963), 113-123.
  6. Chinea D. and Gonzales C., Curvature relations in trans-Sasakian manifolds, Proceedings of the XIIth Portuguese-Spanish Conference on Mathematics, Vol. II(Portuguese) (Braga, 1987), 564-571, Univ. Minho, Braga, 1987.
  7. De U. C. and Tripathi M. M., Ricci Tensor in 3-dimensional Trans-Sasakian Manifolds, Kyungpook Math. J., 43(2003), 247-255.
  8. Gray A. and Hervella L. M., The sixteen classes of almost Hermitian manifolds and their linear invariants, Ann. Mat. Pura Appl., 123(4)(1980), 35-58. https://doi.org/10.1007/BF01796539
  9. Ishii Y., On Conharmonic transformations, Tensor N.S. 7(1957), 73-80.
  10. Janssens D. and Vanhecke L., Almost contact structures and curvature tensors, Kodai Math. J., 4(1981), 1-27. https://doi.org/10.2996/kmj/1138036310
  11. Kenmotsu K., A class of almost contact Riemannian manifolds, Tohoku Math. J., 24(1972), 93-103. https://doi.org/10.2748/tmj/1178241594
  12. Kim J. S., Prasad R. and Tripathi M. M., On generalized Ricci-recurrent trans-Sasakian manifolds, J. Korean Math. Soc., 39(6)(2002), 953-961. https://doi.org/10.4134/JKMS.2002.39.6.953
  13. Marrero J. C., The local structure of trans-Sasakian manifolds, Ann. Mat. Pura Appl., 162(4)(1992), 77-86. J. https://doi.org/10.1007/BF01760000
  14. Marrero J. C. and Chinea D., On trans-Sasakian manifolds, Proceedings of the XIVth Spanish-Portuguese Conference on Mathematics, Vol. I-III (Spanish) (Puerto de la Cruz, 1989), 655-659, Univ. La Laguna, La Laguna, 1990.
  15. Ozgur C. and De U. C., On the quasi-conformal curvature tensor of a Kenmotsu manifold, Mathematica Pannonica, 17/2, (2006), 221-228.
  16. Ozgur C., ${\varphi}$-conformally flat Lorentzian para-Sasakian manifolds, Radovi Matematicki, Vol. 12, (2003), 99-106.
  17. Tanno S., The automorphism groups of almost contact Riemannian manifolds, Tohoku Math. J., 21(1969), 21-38. https://doi.org/10.2748/tmj/1178243031
  18. Tripathi M. M., Trans-Sasakian manifolds are generalized quasi-Sasakian, Nepali Math. Sci. Rep., 18(1-2)(1999-2000), 11-14.
  19. Yano K. and Kon M., Structures on Manifolds, Series in Pure Math. Vol 3. World Sci., (1984).
  20. Yildiz A. and Murathan C., On Lorentzian ${\alpha}$-Sasakian manifolds, Kyungpook Math. J., 45(2005), 95-103.
  21. Zhen G., On conformal symmetric K-contact manifolds, Chinese Quart. J. of Math., 7 (1992), 5-10.
  22. Zhen G., Cabrerizo J.L., Fernandez L.M. and Fernandez M., On ${\xi}$-conformally flat contact metric manifolds, Indian J. Pure Appl. Math., 28(1997), 725-734.

Cited by

  1. On $${\mathcal {M}}$$ M -projectively semisymmetric Lorentzian $$\alpha $$ α -Sasakian manifolds vol.28, pp.5-6, 2017, https://doi.org/10.1007/s13370-017-0493-9
  2. On M-Projective Curvature Tensor of Lorentzian α-Sasakian Manifolds vol.18, 2017, https://doi.org/10.18052/www.scipress.com/IJPMS.18.22