Spin-down Rate of Pinned Superfluid

Details Spin-down Rate of Pinned Superfluid Spin-down Rate of Pinned Superfluid

2006-07-17

arxiv.org/abs/astro-ph/0607364v1

Astrophys.J.650:326-331,2006

Astronomy and Astrophysics

Astrophysics

to appear in ApJ (vol. 649 ?)

Scientific paper

10.1086/506898

The spinning down (up) of a superfluid is associated with a radial motion of its quantized vortices. In the presence of pinning barriers against the motion of the vortices, a spin-down may be still realized through ``random unpinning'' and ``vortex motion,'' as two physically separate processes, as suggested recently. The spin-down rate of a pinned superfluid is calculated, in this framework, by directly solving the equation of motion applicable to only the unpinned moving vortices, at any given time. The results indicate that the pinned superfluid in the crust of a neutron star may as well spin down at the same steady-state rate as the rest of the star, through random unpinning events, while pinning conditions prevail and the superfluid rotational lag is smaller than the critical lag value.

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