49 citations · 113 across the 6 of their papers we have counts for
6 papers
Sufficient conditions for a pseudosymmetric spacetime to be a perfect fluid spacetime
Peibiao Zhao, Uday Chand De, Bülent Ünal +1
The aim of the present paper is to obtain the condition under which a pseudosymmetric spacetime to be a perfect fluid spacetime. It is proven that a pseudosymmetric generalized Rob…
Null Sectional Curvatures of Warped Products
Bengi R. Yavuz, Bülent ünal, Fernando Dobarro
In this paper, we investigate the null (light-like) sectional curvatures of Lorentzian warped product manifolds. We derive the formulas for the null sectional curvature of many wel…
Ricci solitons on singly warped product manifolds and applications
Uday Chand De, Carlo Alberto Mantica, Sameh Shenawy +1
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 manifo…
Sequential Warped Products: Curvature and Killing Vector Fields
Uday Chand De, Sameh Shenawy, Bülent Ünal
In this note, we introduce a new type of warped products called as sequential warped products to cover a wider variety of exact solutions to Einstein's equation. First, we study th…
Killing Vector Fields on Warped Product Manifolds
Sameh Shenawy, Bulent Unal
The present article provides a study of Killing vector fields on warped product manifolds as well as characterization of this structure on standard static and generalized Rober…
Implications of Energy Conditions on Standard Static Space-times
Fernando Dobarro, Bulent Unal
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 rel…