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Global solutions to the Navier-Stokes-Poisson equations for self-gravitating gaseous stars.

机译:自重气体恒星的Navier-Stokes-Poisson方程的整体解。

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摘要

Global weak solutions of the Navier-Stokes-Poisson equations for self-gravitating viscous gaseous stars are constructed with spherically symmetric initial data and a free boundary connected to a surrounding vacuum state. It indicates that the star keeps the star-shaped and bounded in any finite time, and never collapses under a critical gas adiabatic exponent gamma. We establish the energy estimates by showing that the positive kinetic-internal/dissipation energy can dominate the negative gravitational energy for the critical adiabatic exponent gamma, which is conjectured by astrophysicists. Another feature of this problem is the singularity of solutions near the free boundary and the origin. Our approach is to use an effective difference scheme to construct approximate solutions outside a solid ball and then derive some integrability of rho near the origin and other uniform estimates to pass the limit of the integral form.
机译:用于自重粘性气态恒星的Navier-Stokes-Poisson方程的整体弱解是使用球对称的初始数据和连接到周围真空状态的自由边界构造的。这表明恒星在任何有限时间内都保持恒星状并处于有界状态,并且在临界气体绝热指数伽玛下永不坍塌。我们通过显示正内部动能/耗散能可以控制绝热指数伽玛的负重力能量来确定能量估计,绝热指数伽玛由天体物理学家推测。这个问题的另一个特征是自由边界和原点附近的解的奇异性。我们的方法是使用有效的差分方案在实心球外部构造近似解,然后在原点附近推导rho的可积性,并通过其他统一的估计来超越积分形式的极限。

著录项

  • 作者

    Gao, Shu.;

  • 作者单位

    Northwestern University.;

  • 授予单位 Northwestern University.;
  • 学科 Mathematics.;Physics Astrophysics.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 89 p.
  • 总页数 89
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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