{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2026:LPNF5GZECGW32GGZX5TI5YTW47","short_pith_number":"pith:LPNF5GZE","schema_version":"1.0","canonical_sha256":"5bda5e9b2411adbd18d9bf668ee276e7c7a5f9eb74b719240f72a7f647ee02a2","source":{"kind":"arxiv","id":"2605.01593","version":1},"attestation_state":"computed","paper":{"title":"First-principles simulation of shocked H-He mixture along the principal Hugoniot","license":"http://creativecommons.org/licenses/by/4.0/","headline":"Ab initio simulations of shocked H-He mixtures match experimental reflectivity but show no discontinuities indicative of demixing.","cross_cats":[],"primary_cat":"cond-mat.other","authors_text":"Ammar A. Ellaboudy, S. X. Hu, Valentin V. Karasiev","submitted_at":"2026-05-02T19:34:42Z","abstract_excerpt":"Recent laser-shock experiments on an H--He mixture containing 11~$\\%$ helium (atomic fraction) have suggested the presence of an immiscibility region inside Jupiter. Reflectivity measurements were used as the primary diagnostic of H--He demixing, with discontinuities in the optical reflectivity proposed as a signature of phase separation under conditions relevant to Jupiter's interior. Here, we investigate shock-compressed H--He using \\textit{ab initio} molecular dynamics simulations with optical properties evaluated within the Kubo--Greenwood formalism. The equation of state and ionic configu"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":true,"formal_links_present":false},"canonical_record":{"source":{"id":"2605.01593","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.other","submitted_at":"2026-05-02T19:34:42Z","cross_cats_sorted":[],"title_canon_sha256":"39b440c7fd8325b919d23b14ac30270a3b95f7dd687d5076710b534e708d1e85","abstract_canon_sha256":"358035f4491848ef8940470e0a3474df89f07a2d1c09ffcba9284fa1b4118645"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-02T03:04:41.720562Z","signature_b64":"F5RvZi+WuOWV2pFFIjZIedo0WfVRQj8VBoWrMG0Y6NgVtEtjGjOWrfO8Lrt9CWYmJaI5hqwUcDHFjVBnAVK9Aw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5bda5e9b2411adbd18d9bf668ee276e7c7a5f9eb74b719240f72a7f647ee02a2","last_reissued_at":"2026-06-02T03:04:41.720128Z","signature_status":"signed_v1","first_computed_at":"2026-06-02T03:04:41.720128Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"First-principles simulation of shocked H-He mixture along the principal Hugoniot","license":"http://creativecommons.org/licenses/by/4.0/","headline":"Ab initio simulations of shocked H-He mixtures match experimental reflectivity but show no discontinuities indicative of demixing.","cross_cats":[],"primary_cat":"cond-mat.other","authors_text":"Ammar A. Ellaboudy, S. X. Hu, Valentin V. Karasiev","submitted_at":"2026-05-02T19:34:42Z","abstract_excerpt":"Recent laser-shock experiments on an H--He mixture containing 11~$\\%$ helium (atomic fraction) have suggested the presence of an immiscibility region inside Jupiter. Reflectivity measurements were used as the primary diagnostic of H--He demixing, with discontinuities in the optical reflectivity proposed as a signature of phase separation under conditions relevant to Jupiter's interior. Here, we investigate shock-compressed H--He using \\textit{ab initio} molecular dynamics simulations with optical properties evaluated within the Kubo--Greenwood formalism. The equation of state and ionic configu"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"These results suggest that reflectivity alone may not provide a unique or sensitive diagnostic of H-He demixing at low helium concentrations under these conditions.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"That the RS-KDT0 range-separated thermal hybrid functional and the Tr2SCANL meta-GGA accurately capture both the equation of state and the optical response without systematic bias in the warm-dense-matter regime relevant to the experiments.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Ab initio molecular dynamics simulations of shocked H-He mixtures reproduce experimental reflectivity values without discontinuities at conditions where demixing was previously inferred from data.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Ab initio simulations of shocked H-He mixtures match experimental reflectivity but show no discontinuities indicative of demixing.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"a7f312570b704caa0e3ea1bb675d76b20d5d4ee6809868035b64dbbbfaa28938"},"source":{"id":"2605.01593","kind":"arxiv","version":1},"verdict":{"id":"e7162f2a-d08b-4280-80cc-6346fe5d9a3c","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-10T14:55:17.439343Z","strongest_claim":"These results suggest that reflectivity alone may not provide a unique or sensitive diagnostic of H-He demixing at low helium concentrations under these conditions.","one_line_summary":"Ab initio molecular dynamics simulations of shocked H-He mixtures reproduce experimental reflectivity values without discontinuities at conditions where demixing was previously inferred from data.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"That the RS-KDT0 range-separated thermal hybrid functional and the Tr2SCANL meta-GGA accurately capture both the equation of state and the optical response without systematic bias in the warm-dense-matter regime relevant to the experiments.","pith_extraction_headline":"Ab initio simulations of shocked H-He mixtures match experimental reflectivity but show no discontinuities indicative of demixing."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.01593/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"ai_meta_artifact","ran_at":"2026-05-20T17:39:20.689183Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_compliance","ran_at":"2026-05-19T17:09:10.877089Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"6dce10b5f016e5095eba618ed12d180e68c68a6a56669142ca58429367d3fc3b"},"references":{"count":48,"sample":[{"doi":"","year":2017,"title":"S. M. Wahl, W. B. Hubbard, B. Militzer, T. Guillot, Y. Miguel, N. Movshovitz, Y. Kaspi, R. Helled, D. Reese, E. Galanti, S. Levin, J. E. Connerney, and S. J. Bolton, Comparingjupiterinteriorstructurem","work_id":"654feb73-5333-482b-996a-0e104ed22cdf","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2019,"title":"F. Debras and G. Chabrier, New models of jupiter in the context of juno and galileo, The Astrophysical Journal 872, 100 (2019)","work_id":"a396cadd-7719-4330-97d7-5afd0c779e12","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2020,"title":"C. R. Mankovich and J. J. Fortney, Evidence for a di- chotomy in the interior structures of jupiter and saturn from helium phase separation, The Astrophysical Journal 889, 51 (2020)","work_id":"fdeaae31-a4c1-4189-85d9-88151d1d8994","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2024,"title":"S. Howard, S. Müller, and R. Helled, Evolution of jupiter and saturn with helium rain, Astronomy & Astrophysics 689, A15 (2024)","work_id":"186f4ff2-a18e-420e-ab96-66ec7021f3a9","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2025,"title":"A. Sur, R. Tejada Arevalo, Y. Su, and A. Burrows, Si- multaneous evolutionary fits for jupiter and saturn incor- porating fuzzy cores, The Astrophysical Journal Letters 980, L5 (2025)","work_id":"781fb122-ca34-4e35-850a-d844806209c0","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":48,"snapshot_sha256":"3c63476ec57999d72ed91d29c30d2fc947cf8e01a5fb0a2cbed0f3df6e7475c7","internal_anchors":1},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"2605.01593","created_at":"2026-06-02T03:04:41.720186+00:00"},{"alias_kind":"arxiv_version","alias_value":"2605.01593v1","created_at":"2026-06-02T03:04:41.720186+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.01593","created_at":"2026-06-02T03:04:41.720186+00:00"},{"alias_kind":"pith_short_12","alias_value":"LPNF5GZECGW3","created_at":"2026-06-02T03:04:41.720186+00:00"},{"alias_kind":"pith_short_16","alias_value":"LPNF5GZECGW32GGZ","created_at":"2026-06-02T03:04:41.720186+00:00"},{"alias_kind":"pith_short_8","alias_value":"LPNF5GZE","created_at":"2026-06-02T03:04:41.720186+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/LPNF5GZECGW32GGZX5TI5YTW47","json":"https://pith.science/pith/LPNF5GZECGW32GGZX5TI5YTW47.json","graph_json":"https://pith.science/api/pith-number/LPNF5GZECGW32GGZX5TI5YTW47/graph.json","events_json":"https://pith.science/api/pith-number/LPNF5GZECGW32GGZX5TI5YTW47/events.json","paper":"https://pith.science/paper/LPNF5GZE"},"agent_actions":{"view_html":"https://pith.science/pith/LPNF5GZECGW32GGZX5TI5YTW47","download_json":"https://pith.science/pith/LPNF5GZECGW32GGZX5TI5YTW47.json","view_paper":"https://pith.science/paper/LPNF5GZE","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2605.01593&json=true","fetch_graph":"https://pith.science/api/pith-number/LPNF5GZECGW32GGZX5TI5YTW47/graph.json","fetch_events":"https://pith.science/api/pith-number/LPNF5GZECGW32GGZX5TI5YTW47/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/LPNF5GZECGW32GGZX5TI5YTW47/action/timestamp_anchor","attest_storage":"https://pith.science/pith/LPNF5GZECGW32GGZX5TI5YTW47/action/storage_attestation","attest_author":"https://pith.science/pith/LPNF5GZECGW32GGZX5TI5YTW47/action/author_attestation","sign_citation":"https://pith.science/pith/LPNF5GZECGW32GGZX5TI5YTW47/action/citation_signature","submit_replication":"https://pith.science/pith/LPNF5GZECGW32GGZX5TI5YTW47/action/replication_record"}},"created_at":"2026-06-02T03:04:41.720186+00:00","updated_at":"2026-06-02T03:04:41.720186+00:00"}