Constraint on the internal structure of neutron stars from pulsar glitches
December 30, 2016
Pulsars are spinning extremely rapidly with periods as short as about 1
4 milliseconds and delays
of a few milliseconds per year at most, thus providing the most accurate clocks in the Universe.
Nevertheless, sudden spin ups have been detected in some pulsars like the emblematic Vela pulsar.
These abrupt changes in the pulsar’s rotation period have long been thought to be the manifes-
tation of a neutron superfluid permeating the inner crust of neutron stars. However, the neutron
superfluid has been recently found to be so strongly coupled to the crust that it does not carry
enough angular momentum to explain the Vela data. We explore the extent to which pulsar-timing
observations can be reconciled with the standard glitch theory considering the lack of knowledge
of the dense-matter equation of state.
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