{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"674194000d15e9a3f5b7c4c545c3d278f893fd16c1fb9ffab6579b6c25db1ae1","created":"2026-10-03T07:18:08Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"17c9ecd9738729c130e315fa230234e62db720a0176ebf63f60bc5310ec1bae3","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"plasma.warm-dense-matter.thermal-conductivity","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"How fast heat flows through warm dense matter controls how a fusion capsule's shell burns away and how fast its hot core cools. Different theories disagree by large factors, and almost no measurements exist.","posed_since":"","precise":"For hydrogen, carbon and CH at density 1 to 100 $\\mathrm{g}/\\mathrm{cm}^3$ and temperature 10 to 300 eV (ion coupling and electron degeneracy both of order 1), determine the electrical conductivity $\\sigma$ and electron thermal conductivity $\\kappa$, and the Lorenz number $L=\\kappa e^2/(\\sigma T)$ ($T$ in energy units) relative to the degenerate value $\\pi^2/3$; Kubo-Greenwood DFT-MD, time-dependent DFT, average-atom and Lee-More type models differ by factors of up to several. An answer is measured $\\kappa$ and $\\sigma$ with 20 percent precision at two or more conditions and a theory matching them.","problem_ref":null,"references":"","settled_by":"Time-resolved conductivity measurements (e.g. X-ray or optical probes of isochorically heated or shocked samples) at 20 percent precision, compared with first-principles calculations.","status_note":"A code-comparison workshop (Grabowski et al. 2020, https://doi.org/10.1016/j.hedp.2020.100905) documented large spreads between transport models in this regime.","title":"Electron thermal and electrical conductivity of warm dense 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