The ϑ symbol erroneously appeared in Equations, 2, 6, 26, 29, 63, 65 and in the limit expression above Equation 40. All occurrences of ϑ should be replaced by the φ symbol. The Laplace-Belmatri operator in Equation 60 and the following sentence should be represented by a tombstone symbol □ instead of a W. The second expression after the sentence "Our metric equation takes the form of the Schwarzschild solution..." in the Discussion section also erroneously contains the ϑ symbol. The φ symbol should appear in its place. Please see the correct equations here: