{"paper":{"title":"Finite-Temperature Spin Exchange-Correlation Kernel of the Uniform Electron Gas","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Finite-temperature spin XC kernel of the uniform electron gas reveals LSDA spin stiffness discrepancy in warm-dense regime.","cross_cats":["physics.comp-ph","physics.plasm-ph"],"primary_cat":"cond-mat.str-el","authors_text":"Kun Chen, Pengcheng Hou, Youjin Deng, Zhiyi Li","submitted_at":"2026-05-16T09:02:11Z","abstract_excerpt":"The finite-temperature spin response of the uniform electron gas (UEG) is a fundamental reference for spin-polarized and magnetized electron liquids, including warm dense matter (WDM), yet it remains far less constrained than charge response. Using variational diagrammatic Monte Carlo, we compute the static spin exchange--correlation (XC) kernel $K_{xc}(q;T)$ of the unpolarized UEG at metallic densities across the quantum-degenerate, warm-dense, and classical regimes. The kernel connects smoothly to zero-temperature spin-response parametrizations at low temperature, while heating suppresses th"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"The long-wavelength limit provides a direct response test of the spin stiffness implied by thermal local-spin-density-approximation (LSDA) parametrizations, showing low-temperature consistency while exposing a resolved warm-dense residual in current LSDA parametrizations.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The variational diagrammatic Monte Carlo simulations converge sufficiently to capture the true spin XC kernel without uncontrolled systematic biases in the warm-dense regime at metallic densities.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Computes the finite-temperature static spin XC kernel K_xc(q;T) for the unpolarized uniform electron gas across quantum-degenerate to classical regimes.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Finite-temperature spin XC kernel of the uniform electron gas reveals LSDA spin stiffness discrepancy in warm-dense regime.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"3edc1471d45360ce3d961eb652e69aaeb02d0dc6a36277bab23ed013de67a4fd"},"source":{"id":"2605.16888","kind":"arxiv","version":1},"verdict":{"id":"d9bb0a7a-110b-4cd1-bead-8db0ab118900","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-19T20:16:32.454344Z","strongest_claim":"The long-wavelength limit provides a direct response test of the spin stiffness implied by thermal local-spin-density-approximation (LSDA) parametrizations, showing low-temperature consistency while exposing a resolved warm-dense residual in current LSDA parametrizations.","one_line_summary":"Computes the finite-temperature static spin XC kernel K_xc(q;T) for the unpolarized uniform electron gas across quantum-degenerate to classical regimes.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The variational diagrammatic Monte Carlo simulations converge sufficiently to capture the true spin XC kernel without uncontrolled systematic biases in the warm-dense regime at metallic densities.","pith_extraction_headline":"Finite-temperature spin XC kernel of the uniform electron gas reveals LSDA spin stiffness discrepancy in warm-dense regime."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.16888/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"cited_work_retraction","ran_at":"2026-05-19T20:52:42.026312Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_title_agreement","ran_at":"2026-05-19T20:31:19.110599Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_compliance","ran_at":"2026-05-19T20:22:04.324797Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"claim_evidence","ran_at":"2026-05-19T18:41:56.285480Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"ai_meta_artifact","ran_at":"2026-05-19T18:33:26.363467Z","status":"skipped","version":"1.0.0","findings_count":0}],"snapshot_sha256":"299fe3db9970300ab27422f672bf0c0dec51afaaf5c225c0ea873ae1a519b813"},"references":{"count":50,"sample":[{"doi":"","year":2016,"title":"O. A. Hurricane, D. A. Callahan, D. T. Casey,et al., Nat. Phys.12, 800 (2016)","work_id":"28075b1b-b595-427b-add6-9cd0afc00b0f","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2004,"title":"D. Saumon and T. Guillot, Astrophys. J.609, 1170 (2004)","work_id":"45d65d91-89af-481b-875e-f7d3b31fd339","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2018,"title":"Sch¨ ottler and R","work_id":"068101d4-2d33-479f-82ac-8f11bcc42a5b","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2017,"title":"D. Kraus, J. Vorberger, A. Pak,et al., Nat. Astron.1, 606 (2017)","work_id":"09d380c8-448c-4594-b876-55cd4846e5be","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2018,"title":"T. Dornheim, S. Groth, and M. Bonitz, Phys. 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