TY - JOUR T1 - Elementary Approachs on De Sitter Space AU - Öztürk, Emre AU - Yaylı, Yusuf PY - 2019 DA - October Y2 - 2019 DO - 10.36753/mathenot.583477 JF - Mathematical Sciences and Applications E-Notes JO - Math. Sci. Appl. E-Notes PB - Murat TOSUN WT - DergiPark SN - 2147-6268 SP - 183 EP - 190 VL - 7 IS - 2 LA - en AB - In this paper, we characterize the de Sitter space by means of spacelike and timelike curves that fullylies on it. For this purpose, we consider the tangential part of the second derivative of the unit speedcurve on the hypersurface, and obtain the vector equations of the geodesics. We find the geodesics ashyperbolas, ellipses, and helices. Moreover, we give an example of null curve with constant curvature in4−dimensional Minkowski space and we illustrate the geodesics of S11(r) × R . KW - De Sitter space KW - geodesic KW - curve with constant curvature CR - Baek, J., Kim, D.S. and Kim, Y. H., A characterization of the unit sphere, Amer. Math.Monthly, 110(2003), no. 9,830–833. CR - Chen, B.Y., Kim, D.S. and Kim,Y.H., New Characterizations of W-Curves, Publ. Math. Debrecen, 69 (2006), no. 4,457-472. CR - Duggal, K. L. and Bejancu, A.Lightlike Submanifolds of Semi-Riemannian Manifolds and Applications, Kluwer 1996. CR - Ferrandez, A., Gimenez, A.and Lucas, P., Null helices in Lorentzian space forms, Internat. J.Modern Phys. A,16(2001), no. 30, 4845–4863. CR - Inoguchi, J. and Lee, S., Null curves in Minkowski 3-space, Int. Electron. J. Geom., 1(2008), no. 2, 40-83 CR - Kim, D.S., Kim, Y.H. and Lee, J.W. A Characterization of Hyperbolic Spaces, Bull. Korean Math. Soc., 55(2018), no.4, 1103–1107 CR - Lopez, R., Differential Geometry of Curves and Surfaces in Lorentz-Minkowski space, Int.Electron. J. Geom., 7(2014),no.1, 44-107. CR - O’Neill, B., Semi-Riemannian Geometry with Applications to Relativity, Academic Press. Inc., 1983. CR - Öztürk, E. and Yaylı, Y., W-Curves In Lorentz-Minkowski Space, Mathematical Sciences and Applications E-Notes,5(2017), no.2, 76–88. CR - Sakaki, M., Notes on null curves in Minkowski space, Turkish Journal Math, 34(2010), 417-424, doi:10.3906/mat-0812-14 UR - https://doi.org/10.36753/mathenot.583477 L1 - https://dergipark.org.tr/en/download/article-file/833553 ER -