Glitches due to (quasi) neutron-vortex scattering in the superfluid inner crust of a pulsar

Abstract

We revisit the mechanism of vortex unpinning caused by the neutron-vortex scattering \cite{prad1} in the inner crust of a pulsar. The strain energy released by the crustquake is assumed to be absorbed in some part of the inner crust and causes pair-breaking quasi-neutron excitations from the existing free neutron superfluid in the bulk of the inner crust. The scattering of these quasi-neutrons with the vortex core normal neutrons unpins a large number of vortices from the thermally affected regions and results in pulsar glitches. We consider the geometry of a cylindrical shell of the affected pinning region to study the implications of the vortex unpinning in the context of pulsar glitches. We find that a pulsar can release about $\sim 10^{11}-10^{13}$ vortices by this mechanism. These numbers are equivalent to the glitch size of orders $\sim 10^{-11}-10^{-9}$ for Vela-like pulsars with the characteristic age $\tau \simeq 10^4$ years. We also suggest a possibility of a vortex avalanche triggered by the movement of the unpinned vortices. A rough estimate of the glitch size caused by an avalanche shows an encouraging result.

12 pages, 5 figures, Accepted for publication in PRD

References in corpus (11)

• Models of Pulsar Glitches
• 45 Years of Rotation of the Crab Pulsar
• Avalanche dynamics of radio pulsar glitches
• Magnetically-driven crustquakes in neutron stars
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• Unpinning triggers for superfluid vortex avalanches
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Cited by in corpus (3)

• Pi in the Sky: Neutron Stars with Exceptionally Light QCD Axions
• The Green Bank North Celestial Cap Survey IX: Timing Follow-up for 128 Pulsars
• Pulsar as a Weber detector of gravitational waves and a probe to its internal phase transitions