Dynamical Collapse of White Dwarfs in Hartree- and Hartree-Fock Theory

Details Dynamical Collapse of White Dwarfs in Hartree- and Hartree-Fock Theory Dynamical Collapse of White Dwarfs in Hartree- and Hartree-Fock Theory

2006-08-07

arxiv.org/abs/math-ph/0608020v1

Comm. Math. Phys. 274 (2007), no. 3, 737-750

Physics

Mathematical Physics

12 pages

Scientific paper

10.1007/s00220-007-0290-7

We study finite-time blow-up for pseudo-relativistic Hartree- and Hartree-Fock equations, which are model equations for the dynamical evolution of white dwarfs. In particular, we prove that radially symmetric initial configurations with negative energy lead to finite-time blow-up of solutions. Furthermore, we derive a mass concentration estimate for radial blow-up solutions. Both results are mathematically rigorous and are in accordance with Chandrasekhar's physical theory of white dwarfs, stating that stellar configurations beyond a certain limiting mass lead to ``gravitational collapse'' of these objects. Apart from studying blow-up, we also prove local well-posedness of the initial-value problem for the Hartree- and Hartree-Fock equations underlying our analysis, as well as global-in-time existence of solutions with sufficiently small initial data, corresponding to white dwarfs whose stellar mass is below the Chandrasekhar limit.

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