18 citations · 74 across the 23 of their papers we have counts for
5 papers · 1 filter
Conformal Killing--Yano Ricci solitons: Structure, compatibility, and rigidity
Mohammadjavad Habibivostakolaei, Abbas M. Sherif, Yen-Kheng Lim
We introduce a geometric structure -- a conformal Killing--Yano Ricci soliton (CKY--RS) -- that couples conformal Ricci soliton (CRS) geometry to conformal Killing--Yano (CKY) 2--f…
Geodesic completeness of anisotropic cosmologies and the null energy condition
Sebastian Garcia-Saenz, Junjie Hua, Abbas M. Sherif
We demonstrate that a Bianchi-I spacetime in general relativity must be geodesically past-incomplete under the assumption of the null energy condition and provided there exists a t…
Conformal symmetries and MOTS stability
Abbas M. Sherif
Let be a spacelike foliation of a spacetime , and suppose each is foliated by 2-surfaces with spacelike unit normal in . We show tha…
Interior marginally outer trapped surfaces in Hayward black holes
Abbas M. Sherif, Yen-Kheng Lim
We locate interior marginally outer trapped and marginally outer trapped open surfaces (MOTS/MOTOS) in the regular Haward metric with parameter for which a critical (extremal)…
A complete correspondence between the Newman-Penrose and 1+1+2 formalisms
Abbas M Sherif, Peter K S Dunsby
We establish a correspondence between the Newman-Penrose and 1+1+2 semitetrad covariant formalisms by expressing all Newman-Penrose spin coefficients, Ricci scalars, and Weyl scala…