{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"525d2d235927087555033d067e545fa6d6e930e7bd61a10db9ea8dfcd1a53800","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["059d87ff91d5185959eeb3d3695ff244a44163f05b0f5bdcb90f1d654718430e","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"8d62e82f6071875c72e5351fc1f6fd908bf1a87ae57a6fc2a965d480da2fe99e","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"cosmo.lithium-problem.stellar-depletion","kind":"well-posed","literature_status":"open","n":"2","parents":[],"plain":"Inside stars, elements slowly sink and mix, which can carry lithium down to where it burns. The question is whether this happens by the same factor in every old star, as the flat plateau requires.","posed_since":"","precise":"For stars of $0.6 \\text{ to } 0.8\\,M_{\\mathrm{sun}}$ with $[\\mathrm{Fe}/\\mathrm{H}] < -2$ and ages $12 \\text{ to } 13\\,\\mathrm{Gyr}$, determine whether atomic diffusion plus convective-boundary and rotational mixing reduces surface $\\mathrm{Li}/\\mathrm{H}$ from $\\sim 5 \\times 10^{-10}$ to $\\sim 1.6 \\times 10^{-10}$ with star-to-star dispersion below $0.1\\,\\mathrm{dex}$, and reproduces the drop in Li below $[\\mathrm{Fe}/\\mathrm{H}] \\sim -3$. Answer yes with a model calibrated on globular-cluster turnoff and subgiant stars, or no.","problem_ref":"059d87ff91d5185959eeb3d3695ff244a44163f05b0f5bdcb90f1d654718430e","references":"","settled_by":"3D hydrodynamic and asteroseismically calibrated stellar models matched to lithium in globular cluster turnoff and subgiant stars.","status_note":"","title":"Can stellar transport deplete lithium uniformly by a factor 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