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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","authors_text":"Ammar A. Ellaboudy, S. X. Hu, Valentin V. Karasiev","cross_cats":[],"headline":"Ab initio simulations of shocked H-He mixtures match experimental reflectivity but show no discontinuities indicative of demixing.","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.other","submitted_at":"2026-05-02T19:34:42Z","title":"First-principles simulation of shocked H-He mixture along the principal Hugoniot"},"references":{"count":48,"internal_anchors":1,"resolved_work":48,"sample":[{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":1,"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","year":2017},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":2,"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","year":2019},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":3,"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","year":2020},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":4,"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","year":2024},{"cited_arxiv_id":"","doi":"","is_internal_anchor":false,"ref_index":5,"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","year":2025}],"snapshot_sha256":"3c63476ec57999d72ed91d29c30d2fc947cf8e01a5fb0a2cbed0f3df6e7475c7"},"source":{"id":"2605.01593","kind":"arxiv","version":1},"verdict":{"created_at":"2026-05-10T14:55:17.439343Z","id":"e7162f2a-d08b-4280-80cc-6346fe5d9a3c","model_set":{"reader":"grok-4.3"},"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","pith_extraction_headline":"Ab initio simulations of shocked H-He mixtures match experimental reflectivity but show no discontinuities indicative of demixing.","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.","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."}},"verdict_id":"e7162f2a-d08b-4280-80cc-6346fe5d9a3c"}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:62e2a67436572a4cd7862336e4f09449bbbb737418d66531f3b107061b45760e","target":"record","created_at":"2026-06-02T03:04:41Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"358035f4491848ef8940470e0a3474df89f07a2d1c09ffcba9284fa1b4118645","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cond-mat.other","submitted_at":"2026-05-02T19:34:42Z","title_canon_sha256":"39b440c7fd8325b919d23b14ac30270a3b95f7dd687d5076710b534e708d1e85"},"schema_version":"1.0","source":{"id":"2605.01593","kind":"arxiv","version":1}},"canonical_sha256":"5bda5e9b2411adbd18d9bf668ee276e7c7a5f9eb74b719240f72a7f647ee02a2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5bda5e9b2411adbd18d9bf668ee276e7c7a5f9eb74b719240f72a7f647ee02a2","first_computed_at":"2026-06-02T03:04:41.720128Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-02T03:04:41.720128Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"F5RvZi+WuOWV2pFFIjZIedo0WfVRQj8VBoWrMG0Y6NgVtEtjGjOWrfO8Lrt9CWYmJaI5hqwUcDHFjVBnAVK9Aw==","signature_status":"signed_v1","signed_at":"2026-06-02T03:04:41.720562Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.01593","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:62e2a67436572a4cd7862336e4f09449bbbb737418d66531f3b107061b45760e","sha256:0f6d3705264c84d91fb7c0edb37632881044999cc86d777b591d68e279ea5ddc"],"state_sha256":"5ff75518416b3bbfa065aca501ed2d408a84d516bbe2099e6b496cf5f9d3d611"}