Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-30
Phys.Rev.C75:055806,2007
Astronomy and Astrophysics
Astrophysics
7 pages, with figures - PTH, version 2
Scientific paper
10.1103/PhysRevC.75.055806
The inner crust of neutron stars formed of nuclear clusters immersed in a neutron sea has been widely studied in the framework of the Wigner-Seitz approximation since the seminal work of Negele and Vautherin. In this article, the validity of this approximation is discussed in the framework of the band theory of solids. For a typical cell of $^{200}$Zr, present in the external layers of the inner crust, it is shown that the ground state properties of the neutron gas are rather well reproduced by the Wigner-Seitz approximation, while its dynamical properties depend on the energy scale of the process of interest or on the temperature. It is concluded that the Wigner-Seitz approximation is well suited for describing the inner crust of young neutron stars and the collapsing core of massive stars during supernovae explosions. However the band theory is required for low temperature fluid dynamics.
Chamel Nicolas
Khan Elias
Margueron Jean
Naimi S.
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