“…We use cylindrical coordinates (ρ, ϕ, z), where ρ ∈ [0, ∞), ϕ ∈ [0, 2π], z ∈ (−∞, +∞), and natural units where c = h = 1. The angular frequency of the rotating frame is given by ω; the string parameter is η = 1 − 4Λ ∈ (0, 1], where Λ is the topological defect linear mass density (see references [18][19][20][21] for other applications). Notice that this line element is singular at the hard-wall…”