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Heun-type exact solutions emerge for both the radial and the angularequations for the case of a scalar particle coupled to the zero mass limit ofboth the Kerr and Kerr-(anti)de-Sitter spacetime. Since any type D metric hasHeun-type solutions, it is interesting that this property is retained in thezero mass case. This work further refutes the claims that $M$ going to zerolimit of the Kerr metric is both locally and globally the same as the Minkowskimetric.

Exact solution of the wave equation of a scalar particle in the zero mass limit of Kerr and Kerr-(anti-)de-Sitter space-times