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pro vyhledávání: '"Unal, Bulent"'
Autor:
Unal, Bulent
Publikováno v:
free to MU campus, to others for purchase.
Thesis (Ph. D.)--University of Missouri-Columbia, 2000.
Typescript. Vita. Includes bibliographical references (leaves 129-131). Also available on the Internet.
Typescript. Vita. Includes bibliographical references (leaves 129-131). Also available on the Internet.
Externí odkaz:
http://wwwlib.umi.com/cr/mo/fullcit?p9974692
Publikováno v:
Bulletin of the Malaysian Mathematical Sciences Society, Volume 43, pages 3395:3409 (2020)
This study aims mainly at investigating the effects of concircular flatness and concircular symmetry of a warped product manifold on its fibre and base manifolds. Concircularly flat and concircularly symmetric warped product manifolds are investigate
Externí odkaz:
http://arxiv.org/abs/1912.00483
Akademický článek
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Publikováno v:
Journal of Geometry and Physics, Volume 166, August 2021, 104257
The purpose of this article is to study implications of a Ricci soliton warped product manifold to its base and fiber manifolds. First, it is proved that if a warped product manifold is Ricci soliton then its factors are Ricci soliton. Then we study
Externí odkaz:
http://arxiv.org/abs/1508.02794
Autor:
Shenawy, Sameh, Unal, Bulent
Publikováno v:
International Journal of Mathematics, Vol. 26, No. 09, 1550065 (2015)
The present article provides a study of $2-$Killing vector fields on warped product manifolds as well as characterization of this structure on standard static and generalized Robertson-Walker space-times. Some conditions for a $2-$Killing vector fiel
Externí odkaz:
http://arxiv.org/abs/1411.6207
Akademický článek
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Autor:
Dobarro, Fernando, Unal, Bulent
Publikováno v:
Nonlinear Analysis TMA 71 (2009), 5476-5490
In the framework of standard static space times, we state a family of sufficient or necessary conditions for a set of physically reasonable energy and convergence conditions in relativity and related theories. We concentrate our study on questions ab
Externí odkaz:
http://arxiv.org/abs/0901.0370
Autor:
Dobarro, Fernando, Unal, Bulent
We consider Killing vector fields on standard static space-times and obtain equations for a vector field on a standard static space-time to be Killing. We also provide a characterization of Killing vector fields on standard static space-times with co
Externí odkaz:
http://arxiv.org/abs/0801.4692
Autor:
Dobarro, Fernando, Unal, Bulent
Publikováno v:
J.Phys.A40:13907-13930,2007
We consider the curvature of a family of warped products of two pseduo-Riemannian manifolds $(B,g_B)$ and $(F,g_F)$ furnished with metrics of the form $c^{2}g_B \oplus w^2 g_F$ and, in particular, of the type $w^{2 \mu}g_B \oplus w^2 g_F$, where $c,
Externí odkaz:
http://arxiv.org/abs/0704.0595
Autor:
Dobarro, Fernando, Unal, Bulent
Publikováno v:
Advances in Lorentzian Geometry - M. Plaue and M. Scherfner (eds.) - Shaker Verlag, Germany, 2008. -- http://www.shaker.eu/catalogue/Details.asp?ISBN=978-3-8322-7786-4
In this brief survey, we will remark the interaction among the Hessian tensor on a semi-Riemannian manifold and some of the several questions in Lorentzian (and also in semi-Riemannian) geometry where this 2-covariant tensor is involved. In particula
Externí odkaz:
http://arxiv.org/abs/math/0607113