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Pulsar glitches: the crust is not enough.

N Andersson1, K Glampedakis, W C G Ho

  • 1School of Mathematics, University of Southampton, Southampton SO17 1BJ, United Kingdom.

Physical Review Letters
|February 2, 2013
PubMed
Summary

Pulsar glitches may not originate solely from the inner crust. Neutron superfluid entrainment reduces the crust

Area of Science:

  • Astrophysics
  • Neutron Star Physics
  • Condensed Matter Physics

Background:

  • Pulsar glitches are sudden spin-up events observed in neutron stars.
  • Traditionally attributed to vortex dynamics in the neutron superfluid within the inner crust.
  • Neutron superfluid is thought to store angular momentum, releasing it during glitches.

Purpose of the Study:

  • To investigate the impact of neutron superfluid-nuclear lattice coupling on pulsar glitch dynamics.
  • To determine if the inner crust can provide a sufficient reservoir for observed pulsar glitches.
  • To challenge and refine existing models of pulsar glitch mechanisms.

Main Methods:

  • Theoretical modeling of nondissipative entrainment coupling between neutron superfluid and nuclear lattice.

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  • Calculation of the effective moment of inertia of the crust superfluid.
  • Comparison of theoretical predictions with observational data from prolific glitching pulsars.

    • Main Results:

    • Entrainment coupling significantly reduces the mobility of the crust superfluid.
    • This reduction lowers the effective moment of inertia of the angular momentum reservoir in the crust.
    • The required superfluid reservoir for observed glitches exceeds the available amount in the inner crust.

    Conclusions:

    • The inner crust alone may be insufficient to explain the magnitude of pulsar glitches.
    • Current understanding of glitch phenomenon requires revision.
    • Alternative or additional reservoirs for angular momentum must be considered.