{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2023:MIYHN5UEINA5NVUYJSPBV6MUSS","short_pith_number":"pith:MIYHN5UE","schema_version":"1.0","canonical_sha256":"623076f6844341d6d6984c9e1af99494a25f3224b6a57bbc5218eff3a7bec63c","source":{"kind":"arxiv","id":"2311.07774","version":2},"attestation_state":"computed","paper":{"title":"Speed of sound in methane under conditions of planetary interiors","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.EP"],"primary_cat":"physics.plasm-ph","authors_text":"Adrien Descamps, Alex Rigby, Bastian L. Witte, Benjamin K. Ofori-Okai, Bob Nagler, Cameron H. Allen, Chandra B. Curry, Christopher Schoenwaelder, Daniel Haden, Dirk O. Gericke, Eliseo J. Gamboa, Emma E. McBride, Eric Galtier, Florian P. Condamine, Francesco Dallari, Gianluca Gregori, Giulio Monaco, Hae Ja Lee, Hannah Poole, J. B. Hastings, Jongjin B. Kim, Karen Appel, Luke B. Fletcher, Matthew Oliver, Maxence Gauthier, Peihao Sun, Peter Graham, Scott Richardson, Sebastian Goede, Siegfried H. Glenzer, Stefan Funk, Thomas G. White, Thomas Tschentscher, Ulf Zastrau, W. Alex Angermeier","submitted_at":"2023-11-13T21:47:38Z","abstract_excerpt":"We present direct observations of acoustic waves in warm dense matter. We analyze wave-number- and energy-resolved x-ray spectra taken from warm dense methane created by laser heating a cryogenic liquid jet. X-ray diffraction and inelastic free-electron scattering yield sample conditions of 0.3$\\pm$0.1 eV and 0.8$\\pm$0.1 g/cm$^3$, corresponding to a pressure of $\\sim$13 GPa. Inelastic x-ray scattering was used to observe the collective oscillations of the ions. With a highly improved energy resolution of $\\sim$50 meV, we could clearly distinguish the Brillouin peaks from the quasielastic Rayle"},"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":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2311.07774","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.plasm-ph","submitted_at":"2023-11-13T21:47:38Z","cross_cats_sorted":["astro-ph.EP"],"title_canon_sha256":"cd0cf6eb9b8c6f9c6608ba4a2a70e254952122d2913feecf6b841ef51baeea9b","abstract_canon_sha256":"b60b4cdfc879aa3d2fd7edc66bb53373900e2a359bbe209fd6c3279b230994aa"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T08:15:11.723096Z","signature_b64":"fVpg+Nd9hGIuYIma+RWp5NQLU5/g6n5cx2nnpw7YpSLc9Z6HW5igQ5werxUjcoacYA6hIX5kJX/8yUkT+H0xAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"623076f6844341d6d6984c9e1af99494a25f3224b6a57bbc5218eff3a7bec63c","last_reissued_at":"2026-07-05T08:15:11.722619Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T08:15:11.722619Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Speed of sound in methane under conditions of planetary interiors","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.EP"],"primary_cat":"physics.plasm-ph","authors_text":"Adrien Descamps, Alex Rigby, Bastian L. Witte, Benjamin K. Ofori-Okai, Bob Nagler, Cameron H. Allen, Chandra B. Curry, Christopher Schoenwaelder, Daniel Haden, Dirk O. Gericke, Eliseo J. Gamboa, Emma E. McBride, Eric Galtier, Florian P. Condamine, Francesco Dallari, Gianluca Gregori, Giulio Monaco, Hae Ja Lee, Hannah Poole, J. B. Hastings, Jongjin B. Kim, Karen Appel, Luke B. Fletcher, Matthew Oliver, Maxence Gauthier, Peihao Sun, Peter Graham, Scott Richardson, Sebastian Goede, Siegfried H. Glenzer, Stefan Funk, Thomas G. White, Thomas Tschentscher, Ulf Zastrau, W. Alex Angermeier","submitted_at":"2023-11-13T21:47:38Z","abstract_excerpt":"We present direct observations of acoustic waves in warm dense matter. We analyze wave-number- and energy-resolved x-ray spectra taken from warm dense methane created by laser heating a cryogenic liquid jet. X-ray diffraction and inelastic free-electron scattering yield sample conditions of 0.3$\\pm$0.1 eV and 0.8$\\pm$0.1 g/cm$^3$, corresponding to a pressure of $\\sim$13 GPa. Inelastic x-ray scattering was used to observe the collective oscillations of the ions. With a highly improved energy resolution of $\\sim$50 meV, we could clearly distinguish the Brillouin peaks from the quasielastic Rayle"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2311.07774","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2311.07774/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"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":"2311.07774","created_at":"2026-07-05T08:15:11.722678+00:00"},{"alias_kind":"arxiv_version","alias_value":"2311.07774v2","created_at":"2026-07-05T08:15:11.722678+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2311.07774","created_at":"2026-07-05T08:15:11.722678+00:00"},{"alias_kind":"pith_short_12","alias_value":"MIYHN5UEINA5","created_at":"2026-07-05T08:15:11.722678+00:00"},{"alias_kind":"pith_short_16","alias_value":"MIYHN5UEINA5NVUY","created_at":"2026-07-05T08:15:11.722678+00:00"},{"alias_kind":"pith_short_8","alias_value":"MIYHN5UE","created_at":"2026-07-05T08:15:11.722678+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/MIYHN5UEINA5NVUYJSPBV6MUSS","json":"https://pith.science/pith/MIYHN5UEINA5NVUYJSPBV6MUSS.json","graph_json":"https://pith.science/api/pith-number/MIYHN5UEINA5NVUYJSPBV6MUSS/graph.json","events_json":"https://pith.science/api/pith-number/MIYHN5UEINA5NVUYJSPBV6MUSS/events.json","paper":"https://pith.science/paper/MIYHN5UE"},"agent_actions":{"view_html":"https://pith.science/pith/MIYHN5UEINA5NVUYJSPBV6MUSS","download_json":"https://pith.science/pith/MIYHN5UEINA5NVUYJSPBV6MUSS.json","view_paper":"https://pith.science/paper/MIYHN5UE","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2311.07774&json=true","fetch_graph":"https://pith.science/api/pith-number/MIYHN5UEINA5NVUYJSPBV6MUSS/graph.json","fetch_events":"https://pith.science/api/pith-number/MIYHN5UEINA5NVUYJSPBV6MUSS/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/MIYHN5UEINA5NVUYJSPBV6MUSS/action/timestamp_anchor","attest_storage":"https://pith.science/pith/MIYHN5UEINA5NVUYJSPBV6MUSS/action/storage_attestation","attest_author":"https://pith.science/pith/MIYHN5UEINA5NVUYJSPBV6MUSS/action/author_attestation","sign_citation":"https://pith.science/pith/MIYHN5UEINA5NVUYJSPBV6MUSS/action/citation_signature","submit_replication":"https://pith.science/pith/MIYHN5UEINA5NVUYJSPBV6MUSS/action/replication_record"}},"created_at":"2026-07-05T08:15:11.722678+00:00","updated_at":"2026-07-05T08:15:11.722678+00:00"}