  We investigate the Hawking radiation in the gauge-Higgs-Yukawa theory. The
ballistic model is proposed as an effective description of the system. We find
that a spherical domain wall around the black hole is formed by field dynamics
rather than thermal phase-transition. The formation is a general property of
the black hole whose Hawking temperature is equal to or greater than the energy
scale of the theory. The formation of the electroweak wall and that of the GUT
wall are shown. We also find a phenomenon of the spontaneous charging-up of the
black hole by the wall. The Hawking radiation drives a mechanism of the
charge-transportation into the black hole when C- and CP-violation are assumed.
The mechanism can strongly transport the hyper-charge into a black hole of the
electroweak scale.
