{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2004:72VPW5IUZWY3VXHWJKMDKVLDTB","short_pith_number":"pith:72VPW5IU","canonical_record":{"source":{"id":"hep-lat/0408007","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-lat","submitted_at":"2004-08-05T11:05:17Z","cross_cats_sorted":["hep-ph","nucl-th"],"title_canon_sha256":"bf4e1152f6cee24eede1e7abbe69478372eaf237c7fa315ecfa49367c8b5e6b5","abstract_canon_sha256":"576c6a161f26272d7d59276321a6e416e18bf25e5eb6fe16ae4de103068468bd"},"schema_version":"1.0"},"canonical_sha256":"feaafb7514cdb1badcf64a98355563985e2f9ab0d7d9d62e43a820e9bc4a7c8d","source":{"kind":"arxiv","id":"hep-lat/0408007","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-lat/0408007","created_at":"2026-05-18T00:36:57Z"},{"alias_kind":"arxiv_version","alias_value":"hep-lat/0408007v1","created_at":"2026-05-18T00:36:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-lat/0408007","created_at":"2026-05-18T00:36:57Z"},{"alias_kind":"pith_short_12","alias_value":"72VPW5IUZWY3","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"72VPW5IUZWY3VXHW","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"72VPW5IU","created_at":"2026-05-18T12:25:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2004:72VPW5IUZWY3VXHWJKMDKVLDTB","target":"record","payload":{"canonical_record":{"source":{"id":"hep-lat/0408007","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-lat","submitted_at":"2004-08-05T11:05:17Z","cross_cats_sorted":["hep-ph","nucl-th"],"title_canon_sha256":"bf4e1152f6cee24eede1e7abbe69478372eaf237c7fa315ecfa49367c8b5e6b5","abstract_canon_sha256":"576c6a161f26272d7d59276321a6e416e18bf25e5eb6fe16ae4de103068468bd"},"schema_version":"1.0"},"canonical_sha256":"feaafb7514cdb1badcf64a98355563985e2f9ab0d7d9d62e43a820e9bc4a7c8d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:36:57.678047Z","signature_b64":"UykbUs/PORCNOGQfTu4xICUGIh6XPR1rS2jLDF8aTpSvChWLKDyZXPJ6lRUQihTMNRRf/ecjET+1ypOLLwnaAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"feaafb7514cdb1badcf64a98355563985e2f9ab0d7d9d62e43a820e9bc4a7c8d","last_reissued_at":"2026-05-18T00:36:57.677606Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:36:57.677606Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"hep-lat/0408007","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:36:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6B2c94gN610WRnmv3oY4JN5NNEtUSCsVTh+R5HCbtDvpEl19iIMblMKLOOA/GHaXKVI8kwBjCT/wv+9WXSyOBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T06:07:25.945983Z"},"content_sha256":"d4d1211e3c5a41df6ce488567427117697b951bb7dbbbf3aa7b9af1057f7cee4","schema_version":"1.0","event_id":"sha256:d4d1211e3c5a41df6ce488567427117697b951bb7dbbbf3aa7b9af1057f7cee4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2004:72VPW5IUZWY3VXHWJKMDKVLDTB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Vector meson at non-zero baryon density and zero sound","license":"","headline":"","cross_cats":["hep-ph","nucl-th"],"primary_cat":"hep-lat","authors_text":"C.G. Strouthos, S.J. Hands","submitted_at":"2004-08-05T11:05:17Z","abstract_excerpt":"We present simulation results of the (2+1)d four-fermion model with a baryon chemical potential. We examine temporal correlation functions of the vector meson, and find evidence of phonon-like behavior characterised by a linear dispersion relation in the long wavelength limit. We also discuss the consistency of our numerical results with analytical solutions to the Boltzmann equation corresponding to zero sound. We argue that our results provide the first evidence for a collective excitation in a lattice simulation."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-lat/0408007","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:36:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CxQ7+b6oVdSdYcn+SpHzVQeddL00FrtL/qDr9Dq67DBIKHsUS4wvjF0fl8k+eznOk2t4ID7ouBctH7j1gSCDDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T06:07:25.946579Z"},"content_sha256":"e1239b807e4223fd19eb4a4acca046abb14346b52bbb061cb1cdd4be3e2f9337","schema_version":"1.0","event_id":"sha256:e1239b807e4223fd19eb4a4acca046abb14346b52bbb061cb1cdd4be3e2f9337"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/72VPW5IUZWY3VXHWJKMDKVLDTB/bundle.json","state_url":"https://pith.science/pith/72VPW5IUZWY3VXHWJKMDKVLDTB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/72VPW5IUZWY3VXHWJKMDKVLDTB/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-07T06:07:25Z","links":{"resolver":"https://pith.science/pith/72VPW5IUZWY3VXHWJKMDKVLDTB","bundle":"https://pith.science/pith/72VPW5IUZWY3VXHWJKMDKVLDTB/bundle.json","state":"https://pith.science/pith/72VPW5IUZWY3VXHWJKMDKVLDTB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/72VPW5IUZWY3VXHWJKMDKVLDTB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2004:72VPW5IUZWY3VXHWJKMDKVLDTB","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"576c6a161f26272d7d59276321a6e416e18bf25e5eb6fe16ae4de103068468bd","cross_cats_sorted":["hep-ph","nucl-th"],"license":"","primary_cat":"hep-lat","submitted_at":"2004-08-05T11:05:17Z","title_canon_sha256":"bf4e1152f6cee24eede1e7abbe69478372eaf237c7fa315ecfa49367c8b5e6b5"},"schema_version":"1.0","source":{"id":"hep-lat/0408007","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-lat/0408007","created_at":"2026-05-18T00:36:57Z"},{"alias_kind":"arxiv_version","alias_value":"hep-lat/0408007v1","created_at":"2026-05-18T00:36:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-lat/0408007","created_at":"2026-05-18T00:36:57Z"},{"alias_kind":"pith_short_12","alias_value":"72VPW5IUZWY3","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"72VPW5IUZWY3VXHW","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"72VPW5IU","created_at":"2026-05-18T12:25:52Z"}],"graph_snapshots":[{"event_id":"sha256:e1239b807e4223fd19eb4a4acca046abb14346b52bbb061cb1cdd4be3e2f9337","target":"graph","created_at":"2026-05-18T00:36:57Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We present simulation results of the (2+1)d four-fermion model with a baryon chemical potential. We examine temporal correlation functions of the vector meson, and find evidence of phonon-like behavior characterised by a linear dispersion relation in the long wavelength limit. We also discuss the consistency of our numerical results with analytical solutions to the Boltzmann equation corresponding to zero sound. We argue that our results provide the first evidence for a collective excitation in a lattice simulation.","authors_text":"C.G. Strouthos, S.J. Hands","cross_cats":["hep-ph","nucl-th"],"headline":"","license":"","primary_cat":"hep-lat","submitted_at":"2004-08-05T11:05:17Z","title":"Vector meson at non-zero baryon density and zero sound"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-lat/0408007","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:d4d1211e3c5a41df6ce488567427117697b951bb7dbbbf3aa7b9af1057f7cee4","target":"record","created_at":"2026-05-18T00:36:57Z","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":"576c6a161f26272d7d59276321a6e416e18bf25e5eb6fe16ae4de103068468bd","cross_cats_sorted":["hep-ph","nucl-th"],"license":"","primary_cat":"hep-lat","submitted_at":"2004-08-05T11:05:17Z","title_canon_sha256":"bf4e1152f6cee24eede1e7abbe69478372eaf237c7fa315ecfa49367c8b5e6b5"},"schema_version":"1.0","source":{"id":"hep-lat/0408007","kind":"arxiv","version":1}},"canonical_sha256":"feaafb7514cdb1badcf64a98355563985e2f9ab0d7d9d62e43a820e9bc4a7c8d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"feaafb7514cdb1badcf64a98355563985e2f9ab0d7d9d62e43a820e9bc4a7c8d","first_computed_at":"2026-05-18T00:36:57.677606Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:36:57.677606Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"UykbUs/PORCNOGQfTu4xICUGIh6XPR1rS2jLDF8aTpSvChWLKDyZXPJ6lRUQihTMNRRf/ecjET+1ypOLLwnaAg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:36:57.678047Z","signed_message":"canonical_sha256_bytes"},"source_id":"hep-lat/0408007","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d4d1211e3c5a41df6ce488567427117697b951bb7dbbbf3aa7b9af1057f7cee4","sha256:e1239b807e4223fd19eb4a4acca046abb14346b52bbb061cb1cdd4be3e2f9337"],"state_sha256":"e869ad6f75e4b9f260bd80e9ca6867ea892d4151370fd24e52f3b34931d53ec8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nC5HWZAacBjOFx0R/UTrJjyynWBVFgddytiG0UD7eKF2rxF6SXx+1SnyS8rcA+4GXqbfaoIcGqwPoHoVhMfwBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T06:07:25.949741Z","bundle_sha256":"cfb2238e1e4f6e848bdd61c519d3224f5a0ce668344fef35483c270763d2b5e5"}}