{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"e32d66b3f1b96a57b241817afc7dec403b9d6e3454247321087dd7749cb4e754","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["69f9578557b5178b2b16bf79813c9113f719332fa2902519d6955c9406362a13","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"c21f00c63d0f88e7810371b1e637763fcc3a5a1d0170a8a597f0536c352e4749","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"classification","assisted_by":[],"external_id":"cm.crystal-plasticity.avalanche-universality","kind":"well-posed","literature_status":"contested","n":"2","parents":[],"plain":"Small metal crystals deform in sudden jumps called avalanches, whose sizes follow a power law, much like earthquakes. Whether these jumps obey the same simple theory as other avalanche systems, and what sets the largest size, is unsettled.","posed_since":"2001","precise":"Compression of micropillars (Dimiduk et al. 2006) and acoustic emission in ice and metals give slip-size distributions $P(S) \\sim S^{-\\tau} \\exp(-S/S_{0})$ with $\\tau \\sim 1.5 \\text{ to } 1.6$. Determine whether the critical behavior is mean-field depinning ($\\tau = 3/2, S_{0} \\sim (\\sigma_{c} - \\sigma)^{-2}$), a distinct class set by long-range dislocation interactions, or criticality without a tuning parameter, and how $\\tau$ depends on crystal structure (FCC versus BCC) and temperature. An answer is a classification with $\\tau$, cutoff scaling and average avalanche shape.","problem_ref":"69f9578557b5178b2b16bf79813c9113f719332fa2902519d6955c9406362a13","references":"","settled_by":"Stress-resolved avalanche statistics and avalanche shapes from experiments and 3D dislocation dynamics agreeing on exponents and cutoff scaling.","status_note":"","title":"Universality class of dislocation avalanches in microcrystals","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"dc0c7080419d3c9d877865945a4799a30036275ccd217bc79687333c25df9a0a","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"9812ea17cd02bf5db8ea99dc55848612713cee417366167065990df4f01926d3","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"48Rq0CVC6mi7K3FNx7NweCZURCLPFx_JdD39G7CH1i8QND6-hkMroZ0-bSOgSe0kLexG5DiBKn9XbzgQvk0DAA"},"schema":"pubphys.envelope/1"},"record_hash":"dc0c7080419d3c9d877865945a4799a30036275ccd217bc79687333c25df9a0a","leaf_index":2712}