Abstract
The separated radial part of a massive complex scalar wave equation in the Kerr–Sen geometry is shown to satisfy the generalized spheroidal wave equation which is, in fact, a confluent Heun equation up to a multiplier. The Hawking evaporation of scalar particles in the Kerr–Sen black hole background is investigated by the Damour–Ruffini–Sannan method. It is shown that quantum thermal effect of the Kerr–Sen black hole has the same character as that of the Kerr–Newman black hole.
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