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Questions related from Sameh Shenawy
A vector field X on a Riemannian manifold $(M,g)$ is 2-Killing if $L_XL_Xg=0$. This vector field is a generalization of Killing vector fields. There are two articles in the literature review...
14 December 2015 6,741 1 View
Some Riemannian manifolds are expressed as a product manifold. Recently, I have read two articles about space-times. In both articles, the authors prove that a Riemannian manifold \bar{M}^n is...
13 March 2015 9,009 11 View
Suppose that we have two functions f and h on a riemannian manifold M. If Hessf =Hessh can we get a relation between both functions.
22 January 2015 4,100 9 View
Bishop and O'Neil defined warped product manifolds. Space-times are good examples of such warped product manifolds. Is there a famous and important example of space-times I×M where M is itself a...
16 November 2014 8,783 7 View
