{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"bcc700c4f1c15fd5fcf7fae0954694d914bb3491b169d14187a8c0aea3b7b85f","created":"2026-10-03T07:17:59Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"f85baea6dedccdc832b2b97f6eef2d215a6b00f2d60c39572eacfbd25a5eb8d1","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":"1","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 $P(S) \\sim S^{-\\tau} \\operatorname{exp}(-S/S_{0})$ 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":null,"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":"01aa4fb74d0c96c5784d789590ab08ed4af0e1bc9234f0d6784e666e779187ae"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"69f9578557b5178b2b16bf79813c9113f719332fa2902519d6955c9406362a13","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"731675bdfccdde717ef8ffa5df84206cc190fc21182fde54510d0f9e5720aef6","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"aoXosEap2ZExONY_TxXRS3I_uMtF3ZPw95888yfMdA94YJPKBnyyL-1JWQurokHbBXwabbFN2IqvGFS9PVLpCQ"},"schema":"pubphys.envelope/1"},"record_hash":"69f9578557b5178b2b16bf79813c9113f719332fa2902519d6955c9406362a13","leaf_index":923}