Exact solutions to a massive charged scalar field equation in the magnetically charged stringy black-hole geometry and Hawking radiation

Exact solutions of a massive complex scalar field equation in the geometry of a Garfinkle-Horowitz-Strominger (stringy) black hole with magnetic charge is explored. The separated radial and angular parts of the wave equation are solved exactly in the nonextreme case. The angular part is shown to be an ordinary spin-weighted spheroidal harmonics with a spin-weight depending on the magnetic charge. The radial part is achieved to reduce a confluent Heun equation with a multiplier. Finally, based on the solutions, it is shown that the Hawking temperature of the magnetically charged stringy black hole has the same value as that of the Schwarzschild black hole.