132 research outputs found
The gravitational heat conduction and the hierarchical structure in solar interior
With the assumption of local Tsallis equilibrium, the newly defined
gravitational temperature is calculated in the solar interior, whose
distribution curve can be divided into three parts, the solar core region,
radiation region and convection region, in excellent agreement with the solar
hierarchical structure. By generalizing the Fourier law, one new mechanism of
heat conduction, based on the gradient of the gravitational temperature, is
introduced into the astrophysical system. This mechanism is related to the
self-gravity of such self-gravitating system whose characteristic scale is
large enough. It perhaps plays an important role in the astrophysical system
which, in the solar interior, leads to the heat accumulation at the bottom of
the convection layer and then motivates the convection motion.Comment: 8 pages, 2 figures, 1 table, 19 reference
The nonextensive parameter for the rotating astrophysical systems with power-law distributions
We study the nonextensive parameter for the rotating astrophysical systems
with power-law distributions, including both the rotating self-gravitating
system and the rotating space plasma. We extend the equation of nonextensive
parameter to complex system with arbitrary force field, and derive a general
equation of the q-parameter, most generally including both the rotating
self-gravitating systems and the rotating space plasmas. At the same time, we
reproduce the kappa-distribution in space plasmas and obtain equations of the
kappa-parameter. We show that the q-parameter is related not only to the
temperature gradient, the gravitational force and the electromagnetic force,
but also to the inertial centrifugal force and Coriolis force. Thus the
rotation introduces significant effect on nonextensivity in the systems.
Several examples are given to illustrate the nonextensive effect introduced by
the rotation.Comment: 11 pages, 56 reference
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