Geometry of Ricci solitons admitting a new geometric vector field

Document Type : Original Article

Authors

Department of Pure Mathematics, Faculty of Science, Imam Khomeini International University, Qazvin, Iran

Abstract

‎In this paper‎, ‎we define a new geometric vector field on (semi-)Riemannaian manifolds‎. ‎These new vector fields on 3-dimensional Walker manifolds will be derived‎. ‎Then‎, ‎we study Ricci solitons admitting this new vector field (called semi-Killing vector field) as their potential‎. ‎In Riemannain setting‎, ‎we prove that Ricci solitons with semi-Killing potential vector field are Einstein‎. ‎Also‎, ‎It will be shown that such Lorentzian solitons have constant scalar curvature‎. ‎Finally‎, ‎application of this new structure in physics will be investigated‎. ‎In fact‎, ‎we propose that semi-Killing vector fields are in relation to the notion of dark energy in general relativity‎.

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