Thursday, June 20, 2013

1306.4404 (Paulo F. Bedaque et al.)

Friedel crystals and the outer crust of magnetars    [PDF]

Paulo F. Bedaque, Simin Mahmoodifar, Srimoyee Sen
The strong magnetic fields found on the surface of magnetars are known to have profound effects in the physics of atoms in magnetar envelopes. We argue that the Friedel oscillations in the Coulomb force between the ions due to electron shielding can, for certain values of the parameters, be the dominant effect determining the crystal structure in the outer crust of magnetars. We estimate the densities and magnetic fields for which this occurs, compute some of the elastic moduli and lattice phonon dispersion relations in this "Friedel crystal" phase.
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