2,622 research outputs found
Spherical Domain Wall formed by Field Dynamics of Hawking Radiation and Spontaneous Charging-up of Black Hole
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.Comment: 24 pages, 6 figures, LaTeX2e with elsart-style and graphicx-macr
Upper Bounds for the Critical Car Densities in Traffic Flow Problems
In most models of traffic flow, the car density is the only free
parameter in determining the average car velocity . The
critical car density , which is defined to be the car density separating
the jamming phase (with ) and the moving phase (with
), is an important physical quantity to investigate. By
means of simple statistical argument, we show that for the
Biham-Middleton-Levine model of traffic flow in two or higher spatial
dimensions. In particular, we show that in 2 dimension and
in () dimensions.Comment: REVTEX 3.0, 5 pages with 1 figure appended at the back, Minor
revision, to be published in the Sept issue of J.Phys.Soc.Japa
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