{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:RKOGUZ3QKJITQSEF4XESO5ZKSB","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":"cdaf79c5d90d1702dd8a8beb4b4f868fdb69149436e821c47d6d12571fccd484","cross_cats_sorted":["hep-ph","nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2019-09-25T16:44:01Z","title_canon_sha256":"e6c48284cf8ff908bd59ced5a6d2527ce41d6941d2d9c3a5ff6e0bc860561673"},"schema_version":"1.0","source":{"id":"1909.11609","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.11609","created_at":"2026-07-05T01:32:41Z"},{"alias_kind":"arxiv_version","alias_value":"1909.11609v2","created_at":"2026-07-05T01:32:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.11609","created_at":"2026-07-05T01:32:41Z"},{"alias_kind":"pith_short_12","alias_value":"RKOGUZ3QKJIT","created_at":"2026-07-05T01:32:41Z"},{"alias_kind":"pith_short_16","alias_value":"RKOGUZ3QKJITQSEF","created_at":"2026-07-05T01:32:41Z"},{"alias_kind":"pith_short_8","alias_value":"RKOGUZ3Q","created_at":"2026-07-05T01:32:41Z"}],"graph_snapshots":[{"event_id":"sha256:8d1467902bf602f8b4e8e1851f10866cf2522498bfe33718c9dd2eb836cf8b76","target":"graph","created_at":"2026-07-05T01:32:41Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1909.11609/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We predict that the mean transverse momentum of charged hadrons $\\langle p_t\\rangle$ rises as a function of the charged-particle multiplicity in ultracentral nucleus-nucleus collisions. We explain that this phenomenon has a simple physical origin and represents an unambiguous prediction of the hydrodynamic framework of heavy-ion collisions. We argue that the relative increase of $\\langle p_t \\rangle$ is proportional to the speed of sound squared $c_s^2$ of the quark-gluon plasma. Based on the value of $c_s^2$ from lattice QCD, we expect $\\langle p_t\\rangle$ to increase by approximately $18$ Me","authors_text":"Fernando G. Gardim, Giuliano Giacalone, Jean-Yves Ollitrault","cross_cats":["hep-ph","nucl-ex"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2019-09-25T16:44:01Z","title":"The mean transverse momentum of ultracentral heavy-ion collisions: A new probe of hydrodynamics"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.11609","kind":"arxiv","version":2},"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":"sha256:8870709e55dc6c521b1f01945bfe7e9a177ff5ddb0ad680f4a084e0b9adacf14","target":"record","created_at":"2026-07-05T01:32:41Z","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":"cdaf79c5d90d1702dd8a8beb4b4f868fdb69149436e821c47d6d12571fccd484","cross_cats_sorted":["hep-ph","nucl-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nucl-th","submitted_at":"2019-09-25T16:44:01Z","title_canon_sha256":"e6c48284cf8ff908bd59ced5a6d2527ce41d6941d2d9c3a5ff6e0bc860561673"},"schema_version":"1.0","source":{"id":"1909.11609","kind":"arxiv","version":2}},"canonical_sha256":"8a9c6a67705251384885e5c927772a9049e44bbd09c9cf3c26651ca2fc77e7db","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8a9c6a67705251384885e5c927772a9049e44bbd09c9cf3c26651ca2fc77e7db","first_computed_at":"2026-07-05T01:32:41.795089Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:32:41.795089Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Pyr81ypwxV2nsDi5QptSftKXN5y18CZA4QvSOb4WyogJ2sBxmgUlPXKDc/X03rI6fpRg+72psWUwQOLcLfPUCw==","signature_status":"signed_v1","signed_at":"2026-07-05T01:32:41.795576Z","signed_message":"canonical_sha256_bytes"},"source_id":"1909.11609","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8870709e55dc6c521b1f01945bfe7e9a177ff5ddb0ad680f4a084e0b9adacf14","sha256:8d1467902bf602f8b4e8e1851f10866cf2522498bfe33718c9dd2eb836cf8b76"],"state_sha256":"1749ef38cff51525baff0e489c331a2069435e4f523db06f2642170c48dc0b92"}