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ON INDEFINITE LOCALLY CONFORMAL COSYMPLECTIC MANIFOLDS

  • Massamba, Fortune (School of Mathematics Statistics and Computer Science University of KwaZulu-Natal) ;
  • Mavambou, Ange Maloko (School of Mathematics Statistics and Computer Science University of KwaZulu-Natal) ;
  • Ssekajja, Samuel (School of Mathematics Statistics and Computer Science University of KwaZulu-Natal)
  • Received : 2016.09.23
  • Accepted : 2017.02.23
  • Published : 2017.07.31

Abstract

We prove that there exist foliations whose leaves are the maximal integral null manifolds immersed as submanifolds of indefinite locally conformal cosymplectic manifolds. Necessary and sufficient conditions for such leaves to be screen conformal, as well as possessing integrable distributions are given. Using Newton transformations, we show that any compact ascreen null leaf with a symmetric Ricci tensor admits a totally geodesic screen distribution. Supporting examples are also obtained.

Keywords

References

  1. K. Andrzejewski, W. Kozlowski, and K. Niedzialomski, Generalized Newton transformation and its applications to extrinsic geometry, Asian J. Math. 20 (2016), no. 2, 293-322. https://doi.org/10.4310/AJM.2016.v20.n2.a4
  2. K. Andrzejewski and P. G. Walczak, The Newton transformation and new integral formulae for foliated manifolds, Ann. Global Anal. Geom. 37 (2010), no. 2, 103-111. https://doi.org/10.1007/s10455-009-9175-7
  3. D. E. Blair, Riemannian Geometry of Contact and Symplectic Manifolds, Progress in Mathematics, vol. 203. Birkhuser, New York, 2002.
  4. M. Capursi and S. Dragomir, On manifolds admitting metrics which are locally conformal to cosymplectic metrics: their canonical foliations, Boothby-Wang fiberings, and real homology type, Colloq. Math. 64 (1993), no. 1, 29-40. https://doi.org/10.4064/cm-64-1-29-40
  5. D. Chinea and J. C. Marrero, Conformal changes of almost cosymplectic manifolds, Demonstratio Math. 25 (1992), no. 3, 641-656.
  6. J. Dong and X. Liu, Totally umbilical lightlike hypersurfaces in Robertson-Walker spacetimes, ISRN Geom. 2014 (2014), Art. ID 974695, 10 pages.
  7. S. Dragomir and K. L. Duggal, Indefinite locally conformal Kahler manifolds, Differential Geom. Appl. 25 (2007), no. 1, 8-22. https://doi.org/10.1016/j.difgeo.2006.11.002
  8. K. L. Duggal and A. Bejancu, Lightlike submanifolds of semi-Riemannian manifolds and applications, Mathematics and Its Applications. Kluwer Publishers, 1996.
  9. K. L. Duggal and B. Sahin, Differential Geometry of Lightlike Submanifolds, Frontiers in Mathematics, Birkhauser Verlag, Basel, 2010.
  10. S. I. Goldberg and K. Yano, Integrability of almost cosymplectic structures, Pacific J. Math. 31 (1969), 373-382. https://doi.org/10.2140/pjm.1969.31.373
  11. D. H. Jin, Ascreen lightlike hypersurfaces of a semi-Riemannian space form with a semi-symmetric non-metric connection, Commun. Korean Math. Soc. 29 (2014), no. 2, 311-317. https://doi.org/10.4134/CKMS.2014.29.2.311
  12. D. N. Kupeli, Singular semi-Riemannian geometry, Mathematics and Its Applications, 366, Kluwer Academic Publishers, 1996.
  13. F. Massamba and A. Maloko Mavambou, A class of locally conformal almost cosymplectic manifolds, Bull. Malays. Math. Sci. Soc. DOI 10.1007/s40840-016-0309-3, 2016.
  14. F. Massamba and S. Ssekajja, Quasi generalized CR-lightlike submanifolds of indefinite nearly Sasakian manifolds, Arab. J. Math. 5 (2016), no. 2, 87-101. https://doi.org/10.1007/s40065-016-0146-0
  15. Z. Olszak, On almost cosymplectic manifolds, Kodai Math. J. 4 (1981), no. 2, 239-250. https://doi.org/10.2996/kmj/1138036371
  16. Z. Olszak, Locally conformal almost cosymplectic manifolds, Colloq. Math. 57 (1989), no. 1, 73-87. https://doi.org/10.4064/cm-57-1-73-87
  17. I. Vaisman, Conformal changes of almost contact metric structures, Geometry and differential geometry (Proc. Conf., Univ. Haifa, Haifa, 1979), pp. 435-443, Lecture Notes in Math., 792, Springer, Berlin, 1980.