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With the aim of constraining the structural properties of neutron stars and the equation of state of dense matter, we study sudden spin-ups, glitches, occurring in the Vela pulsar and in six other pulsars. We present evidence that glitches represent a self-regulating instability for which the star prepares over a waiting time. The angular momentum requirements of glitches in Vela indicate that 1. 4% of the star's moment of inertia drives these events. If glitches originate in the liquid of the inner crust, Vela's ``radiation radius'' R_ must exceed 12km for a mass of 1. 4M_. Observational tests of whether other neutron stars obey this constraint will be possible in the near future.
Link et al. (Mon,) studied this question.
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