DO EVAPORATING 4D BLACK HOLES FORM PHOTOSPHERES AND/OR CHROMOSPHERES?

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Several authors have claimed that the observable Hawking emission from a microscopic black hole is significantly modified by the formation of a photosphere or chromosphere around the black hole due to QED or QCD interactions between the emitted particles. Analyzing these models we identify a number of physical and geometrical effects which invalidate them. In all cases, we find that the observational signatures of a cosmic or Galactic background of black holes or an individual black hole remain essentially those of the standard Hawking model, with little change to the detection probability.

Twelfth Marcel Grossmann Meeting, Paris 12 - 18 July 2009; 4 pages; additional references added to arXiv version

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