Tkachenko modes as sources of quasiperiodic pulsar spin variations

Details Tkachenko modes as sources of quasiperiodic pulsar spin variations Tkachenko modes as sources of quasiperiodic pulsar spin variations

2007-08-21

arxiv.org/abs/0708.2876v2

Phys.Rev.D77:023008,2008

Astronomy and Astrophysics

Astrophysics

7 pages, 3 figures, uses RevTex, v2: added discussion/references, matches published version

Scientific paper

10.1103/PhysRevD.77.023008

We study the long wavelength shear modes (Tkachenko waves) of triangular lattices of singly quantized vortices in neutron star interiors taking into account the mutual friction between the superfluid and the normal fluid and the shear viscosity of the normal fluid. The set of Tkachenko modes that propagate in the plane orthogonal to the spin vector are weakly damped if the coupling between the superfluid and normal fluid is small. In strong coupling, their oscillation frequencies are lower and are undamped for small and moderate shear viscosities. The periods of these modes are consistent with the observed ~100-1000 day variations in spin of PSR 1828-11.

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