Black holes and the absorption rate of cosmological scalar fields

Abstract

We study the absorption of a massless scalar field by a static black hole. Using the continuity equation that arises from the Klein-Gordon equation, it is possible to define a normalized absorption rate $\Gamma (t)$ for the scalar field as it falls into the black hole. It is found that the absorption mainly depends upon the characteristics wavelengths involved in the physical system: the mean wavenumber and the width of the wave packet, but that it is insensitive to the scalar field's strength. By taking a limiting procedure, we determine the minimum absorption fraction of the scalar field's mass by the black hole, which is around 50%.

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References in corpus (5)

• Inflation, dark matter and dark energy in the string landscape
• Bosonic gas as a Galactic Dark Matter Halo
• The supermassive black hole in NGC4486a detected with SINFONI at the VLT
• Scalar Field Dark Matter: behavior around black holes
• The connection between entropy and the absorption spectra of Schwarzschild black holes for light and massless scalar fields

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• Accretion of a Phantom Scalar Field by a Black Hole: restrictions on the field distribution
• Dynamical de Sitter black holes in a quasi-stationary expansion