Absorption cross section of RN and SdS extremal black hole
Abstract
The nature of scalar wave functions near the horizon of Reissner Nordstrom (RN) extremal and Schwarzschild-de Sitter (SdS) extremal black holes are found using WKB approximation and the effect of reflection of waves from the horizon. The absorption cross section σabs when RN extremal and SdS extremal black holes placed in a Klein-Gordon field is calculated.
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