Browsing by Author "El-Sayied, H. K"

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    On symmetries of generalized Robertson-Walker spacetimes and applications
    (TAYLOR & FRANCIS LTD, 2017) Syied, Noha; Shenawy, Sameh; El-Sayied, H. K
    The purpose of the present article is to study and characterize several types of symmetries of generalized Robertson-Walker spacetimes. Conformal vector fields, curvature and Ricci collineations are studied. Many implications for existence of these symmetries on generalized Robertson-Walker spacetimes are obtained. Finally, Ricci solitons on generalized Robertson-Walker spacetimes admitting conformal vector fields are investigated.