Ricci soliton on (κ, μ)′-almost Kenmotsu manifolds

Let ( , ) be a non-Kenmotsu ( , )′-almost Kenmotsu manifold of dimension 2 + 1. In this paper, we prove that if the metric of is a *-Ricci soliton, then either is locally isometric to the product ℍ (−4)×ℝ or the potential vector field is strict infinitesimal contact transformation. Moreover, two concrete examples of ( , )′-almost Kenmotsu 3-manifolds admitting a Killing vector field and strict infinitesimal contact transformation are given.