{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:UGRUO4RNTGIPYULOXUJGFU2TYV","short_pith_number":"pith:UGRUO4RN","canonical_record":{"source":{"id":"2504.19208","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"nucl-th","submitted_at":"2025-04-27T12:23:43Z","cross_cats_sorted":["hep-ph"],"title_canon_sha256":"c0f295b6776a0fc0b0be904343d2e4b16d7ac1466fb529586a4426ecb4ed2097","abstract_canon_sha256":"e40b7eb88dacc10aead1b44a8e3cb3e23f7aa3e159c76e44111cad00e7d7e5bb"},"schema_version":"1.0"},"canonical_sha256":"a1a347722d9990fc516ebd1262d353c54331a8302fb93ec5e041033dd2464452","source":{"kind":"arxiv","id":"2504.19208","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.19208","created_at":"2026-07-05T10:54:53Z"},{"alias_kind":"arxiv_version","alias_value":"2504.19208v1","created_at":"2026-07-05T10:54:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.19208","created_at":"2026-07-05T10:54:53Z"},{"alias_kind":"pith_short_12","alias_value":"UGRUO4RNTGIP","created_at":"2026-07-05T10:54:53Z"},{"alias_kind":"pith_short_16","alias_value":"UGRUO4RNTGIPYULO","created_at":"2026-07-05T10:54:53Z"},{"alias_kind":"pith_short_8","alias_value":"UGRUO4RN","created_at":"2026-07-05T10:54:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:UGRUO4RNTGIPYULOXUJGFU2TYV","target":"record","payload":{"canonical_record":{"source":{"id":"2504.19208","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"nucl-th","submitted_at":"2025-04-27T12:23:43Z","cross_cats_sorted":["hep-ph"],"title_canon_sha256":"c0f295b6776a0fc0b0be904343d2e4b16d7ac1466fb529586a4426ecb4ed2097","abstract_canon_sha256":"e40b7eb88dacc10aead1b44a8e3cb3e23f7aa3e159c76e44111cad00e7d7e5bb"},"schema_version":"1.0"},"canonical_sha256":"a1a347722d9990fc516ebd1262d353c54331a8302fb93ec5e041033dd2464452","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:54:53.677499Z","signature_b64":"ZtWbJHDqCPL3oqrlSics3p4MURCTtM2tBAP4KS+pWZ2QW6Q8urKdbcQNnR+JTVCHuCy2ZN2/BrQShvocfE+8Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a1a347722d9990fc516ebd1262d353c54331a8302fb93ec5e041033dd2464452","last_reissued_at":"2026-07-05T10:54:53.677076Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:54:53.677076Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2504.19208","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":"2026-07-05T10:54:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WHSzboKAdmOhKISkgzyj30Y2o15VRmNj2bYbqfk3/XnEm6BRGS0OSqeEL3v8RkqaOx1fAVdzB5gMwEvoy2AbAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T05:23:36.834423Z"},"content_sha256":"a355cca2a155e08d57d1dd3e98d571a611e1efbf045c6b67a82559ee8309e7e9","schema_version":"1.0","event_id":"sha256:a355cca2a155e08d57d1dd3e98d571a611e1efbf045c6b67a82559ee8309e7e9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:UGRUO4RNTGIPYULOXUJGFU2TYV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Impact of Initial-State Nuclear and Sub-Nucleon Structures on Ultra-Central Puzzle in Heavy Ion Collisions","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":["hep-ph"],"primary_cat":"nucl-th","authors_text":"Long-Gang Pang, Qi Wang, Xin-Nian Wang","submitted_at":"2025-04-27T12:23:43Z","abstract_excerpt":"Hydrodynamic models fail to describe the near-equal $v_2/v_3$ ratio observed in ultra-central heavy-ion collisions, despite their success in other centrality classes. This discrepancy stems from shear viscosity suppressing higher-order geometric eccentricities, resulting in underestimated $v_3$ when using the conventional QGP viscosity coefficient. We explore two initial-state modifications to resolve this puzzle: (1) enforcing a minimum nucleon separation distance to homogenize distributions, and (2) amplifying sub-nucleon structures to reduce initial eccentricity. Using TRENTo initial condit"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.19208","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2504.19208/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T10:54:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Xz/hkVJzQ5KU0Xehs2pR9HRIezPpbNjzc++/YmbC3OBq1mMMxbSJHxltHEJ/aAZ8RPRjKRsflOiF3JbIKJzzCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T05:23:36.834933Z"},"content_sha256":"d2d17a0938ca90be633b0bdc0e7928734db4657273dc8f3612df9a8e3042a7cf","schema_version":"1.0","event_id":"sha256:d2d17a0938ca90be633b0bdc0e7928734db4657273dc8f3612df9a8e3042a7cf"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UGRUO4RNTGIPYULOXUJGFU2TYV/bundle.json","state_url":"https://pith.science/pith/UGRUO4RNTGIPYULOXUJGFU2TYV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UGRUO4RNTGIPYULOXUJGFU2TYV/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":"2026-08-06T05:23:36Z","links":{"resolver":"https://pith.science/pith/UGRUO4RNTGIPYULOXUJGFU2TYV","bundle":"https://pith.science/pith/UGRUO4RNTGIPYULOXUJGFU2TYV/bundle.json","state":"https://pith.science/pith/UGRUO4RNTGIPYULOXUJGFU2TYV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UGRUO4RNTGIPYULOXUJGFU2TYV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:UGRUO4RNTGIPYULOXUJGFU2TYV","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":"e40b7eb88dacc10aead1b44a8e3cb3e23f7aa3e159c76e44111cad00e7d7e5bb","cross_cats_sorted":["hep-ph"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"nucl-th","submitted_at":"2025-04-27T12:23:43Z","title_canon_sha256":"c0f295b6776a0fc0b0be904343d2e4b16d7ac1466fb529586a4426ecb4ed2097"},"schema_version":"1.0","source":{"id":"2504.19208","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.19208","created_at":"2026-07-05T10:54:53Z"},{"alias_kind":"arxiv_version","alias_value":"2504.19208v1","created_at":"2026-07-05T10:54:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.19208","created_at":"2026-07-05T10:54:53Z"},{"alias_kind":"pith_short_12","alias_value":"UGRUO4RNTGIP","created_at":"2026-07-05T10:54:53Z"},{"alias_kind":"pith_short_16","alias_value":"UGRUO4RNTGIPYULO","created_at":"2026-07-05T10:54:53Z"},{"alias_kind":"pith_short_8","alias_value":"UGRUO4RN","created_at":"2026-07-05T10:54:53Z"}],"graph_snapshots":[{"event_id":"sha256:d2d17a0938ca90be633b0bdc0e7928734db4657273dc8f3612df9a8e3042a7cf","target":"graph","created_at":"2026-07-05T10:54:53Z","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/2504.19208/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Hydrodynamic models fail to describe the near-equal $v_2/v_3$ ratio observed in ultra-central heavy-ion collisions, despite their success in other centrality classes. This discrepancy stems from shear viscosity suppressing higher-order geometric eccentricities, resulting in underestimated $v_3$ when using the conventional QGP viscosity coefficient. We explore two initial-state modifications to resolve this puzzle: (1) enforcing a minimum nucleon separation distance to homogenize distributions, and (2) amplifying sub-nucleon structures to reduce initial eccentricity. Using TRENTo initial condit","authors_text":"Long-Gang Pang, Qi Wang, Xin-Nian Wang","cross_cats":["hep-ph"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"nucl-th","submitted_at":"2025-04-27T12:23:43Z","title":"Impact of Initial-State Nuclear and Sub-Nucleon Structures on Ultra-Central Puzzle in Heavy Ion Collisions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.19208","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:a355cca2a155e08d57d1dd3e98d571a611e1efbf045c6b67a82559ee8309e7e9","target":"record","created_at":"2026-07-05T10:54:53Z","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":"e40b7eb88dacc10aead1b44a8e3cb3e23f7aa3e159c76e44111cad00e7d7e5bb","cross_cats_sorted":["hep-ph"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"nucl-th","submitted_at":"2025-04-27T12:23:43Z","title_canon_sha256":"c0f295b6776a0fc0b0be904343d2e4b16d7ac1466fb529586a4426ecb4ed2097"},"schema_version":"1.0","source":{"id":"2504.19208","kind":"arxiv","version":1}},"canonical_sha256":"a1a347722d9990fc516ebd1262d353c54331a8302fb93ec5e041033dd2464452","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a1a347722d9990fc516ebd1262d353c54331a8302fb93ec5e041033dd2464452","first_computed_at":"2026-07-05T10:54:53.677076Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:54:53.677076Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ZtWbJHDqCPL3oqrlSics3p4MURCTtM2tBAP4KS+pWZ2QW6Q8urKdbcQNnR+JTVCHuCy2ZN2/BrQShvocfE+8Bg==","signature_status":"signed_v1","signed_at":"2026-07-05T10:54:53.677499Z","signed_message":"canonical_sha256_bytes"},"source_id":"2504.19208","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a355cca2a155e08d57d1dd3e98d571a611e1efbf045c6b67a82559ee8309e7e9","sha256:d2d17a0938ca90be633b0bdc0e7928734db4657273dc8f3612df9a8e3042a7cf"],"state_sha256":"13d6196302224762068627723fd4cd73fb54a918193600ecb2de53c60f85165e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zG0N3HRrN+zal/jbUePXBkoF57bfgyG+iAXqZpm5D3Kj0Wl+7fv0dwsk18eQ1sEuwYJEyCaWe/bh+LF+g2KIAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T05:23:36.840042Z","bundle_sha256":"e8b974c49560501559a9432df48ad4fb02cde55d1a2a4c448739cb9c887761e4"}}