{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"80168426ee82ee0e65245182d9b6af435de1acc856985249aab4c0437795421e","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["3c1e89ff71038316840faa027f3b65ecc2b47aefbcff026f0f3bfde571aec85d","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"cd2a295448b218bb187e665b7fa970aecac97d63c6f4b851def78fb4378ba868","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"astro.neutron-star-interiors.glitch-trigger","kind":"phenomenon","literature_status":"open","n":"2","parents":[],"plain":"Pulsars, spinning neutron stars, sometimes suddenly spin faster in a glitch. The superfluid inside is thought to dump its spin into the crust, but what starts the event, a cascade of released vortices (tiny whirlpools) or a crack in the crust, is unknown.","posed_since":"1969","precise":"Glitches have fractional spin-up $\\Delta \\nu/\\nu \\sim 10^{-11} \\text{ to } 10^{-5}$, with power-law size distributions in most pulsars and quasi-periodic large events ($\\Delta \\nu/\\nu \\sim 10^{-6}$, about every 3 yr) in Vela. Determine the trigger: collective unpinning avalanches of superfluid vortices, crust quakes, or hydrodynamic instabilities of the superfluid-crust counterflow, and derive the observed size and waiting-time statistics and the sub-minute spin-up timescale.","problem_ref":"3c1e89ff71038316840faa027f3b65ecc2b47aefbcff026f0f3bfde571aec85d","references":"","settled_by":"A model of vortex-crust dynamics that reproduces glitch size and waiting-time distributions and the resolved spin-up of a Vela glitch.","status_note":"A single-pulse recording of the 2016 Vela glitch showed pulse-shape changes during the event (Palfreyman et al., Nature, 2018), constraining but not deciding the trigger.","title":"What triggers pulsar glitches?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"022f0bbfb635ead3b169e2bbb8b9ad3e6cbaf842ca534b405d5a6adc6bc4f057","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"4d8358b9879ec2e5357235f3670fc56777acc0d17ea0d65eeda77b4385607ab5","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"EH43CM4gLAFf1oURoqYzm8EWNWMYZWpT0R2VsdtguJmlNTtpeMKkPxYGSip2OGpcNPEHtupgEzwiCizyRHw2DA"},"schema":"pubphys.envelope/1"},"record_hash":"022f0bbfb635ead3b169e2bbb8b9ad3e6cbaf842ca534b405d5a6adc6bc4f057","leaf_index":2392}