Absorption of massive scalar field by a charged black hole
Abstract
The absorption of a quantum particle represented as a massive scalar field by a ReisnerNordstrom black hole is investigated by observing how a certain reflection coefficient of the scalar wave changes in various cases. The radial wave equation in the ReisnerNordstrom geometry is obtained from the wave equation for a charged scalar field, and it is shown that the reflection coefficient depends on the ratio of the Schwarzschild radius to the Compton wavelength. The absorption and reflection of a spherical wave by a small black hole is analyzed. It is found that the wave will be almost completely reflected in the lowenergy case when the Schwarzschild radius is much less than the Compton wavelength and that almost total absorption occurs in the highenergy limit. It is also found that the wave will be amplified when the levelcrossing condition is satisfied.
 Publication:

Physics Letters A
 Pub Date:
 April 1976
 Bibcode:
 1976PhLA...61..371N
 Keywords:

 Absorption;
 Black Holes (Astronomy);
 Scalars;
 Astronomical Models;
 Reflectance;
 Schwarzschild Metric;
 Wave Equations;
 Astrophysics