{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:OAVBK25HKPZF437JBDSOWL32DY","short_pith_number":"pith:OAVBK25H","canonical_record":{"source":{"id":"1509.04503","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2015-09-15T11:34:35Z","cross_cats_sorted":["nucl-th"],"title_canon_sha256":"77a21a4ca73fd5c2c47885111c800e6bc3a22e889da91f248ed71aa962facbc1","abstract_canon_sha256":"2948943d3aa77f87fadb686a9182f0543193ba7667a8957de2bbaf8cb414ac0e"},"schema_version":"1.0"},"canonical_sha256":"702a156ba753f25e6fe908e4eb2f7a1e185b6318fee9e4a5e304c144f817f9ee","source":{"kind":"arxiv","id":"1509.04503","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.04503","created_at":"2026-05-18T01:32:58Z"},{"alias_kind":"arxiv_version","alias_value":"1509.04503v1","created_at":"2026-05-18T01:32:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.04503","created_at":"2026-05-18T01:32:58Z"},{"alias_kind":"pith_short_12","alias_value":"OAVBK25HKPZF","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_16","alias_value":"OAVBK25HKPZF437J","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_8","alias_value":"OAVBK25H","created_at":"2026-05-18T12:29:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:OAVBK25HKPZF437JBDSOWL32DY","target":"record","payload":{"canonical_record":{"source":{"id":"1509.04503","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2015-09-15T11:34:35Z","cross_cats_sorted":["nucl-th"],"title_canon_sha256":"77a21a4ca73fd5c2c47885111c800e6bc3a22e889da91f248ed71aa962facbc1","abstract_canon_sha256":"2948943d3aa77f87fadb686a9182f0543193ba7667a8957de2bbaf8cb414ac0e"},"schema_version":"1.0"},"canonical_sha256":"702a156ba753f25e6fe908e4eb2f7a1e185b6318fee9e4a5e304c144f817f9ee","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:32:58.706127Z","signature_b64":"meuOdycNDLqlh4utIE2rxqobyjUDewwlxbImmsNAg0AfHmlQl6OqD4SswNstFd6nA2pqJtuaZWio/Fl5mWVaBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"702a156ba753f25e6fe908e4eb2f7a1e185b6318fee9e4a5e304c144f817f9ee","last_reissued_at":"2026-05-18T01:32:58.705396Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:32:58.705396Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1509.04503","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":"2026-05-18T01:32:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dKhuT36Av8x4QXYCNi57FbCMlDAlpxZe1Jrc6fOdB5OtCR5Jr6Hjs7ERn4d5Ie7tKuCq/OvuNVMIYuiRM/xDAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T17:16:28.937093Z"},"content_sha256":"5dbaa9dc6694404fcfe037b5ac7251d9db26000e672beb11188224de38854016","schema_version":"1.0","event_id":"sha256:5dbaa9dc6694404fcfe037b5ac7251d9db26000e672beb11188224de38854016"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:OAVBK25HKPZF437JBDSOWL32DY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Initial state in heavy ion collisions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["nucl-th"],"primary_cat":"hep-ph","authors_text":"T. Lappi","submitted_at":"2015-09-15T11:34:35Z","abstract_excerpt":"We briefly review advances in understanding the initial stages of a heavy ion collision. In particular the focus is on moving from parametrizing the initial state to calculating its properties from QCD, consistently with the description of hard probes and dilute-dense scattering experiments. Modeling the event-by-event fluctuating nuclear geometry in initial state calculations has significantly improved in recent years. We also discuss prospects of directly seeing effects of particle correlations created in the initial state in the experimental observables."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.04503","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":"2026-05-18T01:32:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5ZL88LNSgz2s/DriYBALAPhEIW9y2gXHZyYnFTgImpNI8d/t3JsXSbMjzUX25Ec8SKSwO1+I6bknDniew9w2Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T17:16:28.937487Z"},"content_sha256":"72bb01bd0f97fc675c2e5f9209e25d0333e8dc177f8813a063b29216ff0640a1","schema_version":"1.0","event_id":"sha256:72bb01bd0f97fc675c2e5f9209e25d0333e8dc177f8813a063b29216ff0640a1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OAVBK25HKPZF437JBDSOWL32DY/bundle.json","state_url":"https://pith.science/pith/OAVBK25HKPZF437JBDSOWL32DY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OAVBK25HKPZF437JBDSOWL32DY/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":"2026-05-27T17:16:28Z","links":{"resolver":"https://pith.science/pith/OAVBK25HKPZF437JBDSOWL32DY","bundle":"https://pith.science/pith/OAVBK25HKPZF437JBDSOWL32DY/bundle.json","state":"https://pith.science/pith/OAVBK25HKPZF437JBDSOWL32DY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OAVBK25HKPZF437JBDSOWL32DY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:OAVBK25HKPZF437JBDSOWL32DY","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":"2948943d3aa77f87fadb686a9182f0543193ba7667a8957de2bbaf8cb414ac0e","cross_cats_sorted":["nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2015-09-15T11:34:35Z","title_canon_sha256":"77a21a4ca73fd5c2c47885111c800e6bc3a22e889da91f248ed71aa962facbc1"},"schema_version":"1.0","source":{"id":"1509.04503","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.04503","created_at":"2026-05-18T01:32:58Z"},{"alias_kind":"arxiv_version","alias_value":"1509.04503v1","created_at":"2026-05-18T01:32:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.04503","created_at":"2026-05-18T01:32:58Z"},{"alias_kind":"pith_short_12","alias_value":"OAVBK25HKPZF","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_16","alias_value":"OAVBK25HKPZF437J","created_at":"2026-05-18T12:29:34Z"},{"alias_kind":"pith_short_8","alias_value":"OAVBK25H","created_at":"2026-05-18T12:29:34Z"}],"graph_snapshots":[{"event_id":"sha256:72bb01bd0f97fc675c2e5f9209e25d0333e8dc177f8813a063b29216ff0640a1","target":"graph","created_at":"2026-05-18T01:32:58Z","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 briefly review advances in understanding the initial stages of a heavy ion collision. In particular the focus is on moving from parametrizing the initial state to calculating its properties from QCD, consistently with the description of hard probes and dilute-dense scattering experiments. Modeling the event-by-event fluctuating nuclear geometry in initial state calculations has significantly improved in recent years. We also discuss prospects of directly seeing effects of particle correlations created in the initial state in the experimental observables.","authors_text":"T. Lappi","cross_cats":["nucl-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2015-09-15T11:34:35Z","title":"Initial state in heavy ion collisions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.04503","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":"sha256:5dbaa9dc6694404fcfe037b5ac7251d9db26000e672beb11188224de38854016","target":"record","created_at":"2026-05-18T01:32:58Z","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":"2948943d3aa77f87fadb686a9182f0543193ba7667a8957de2bbaf8cb414ac0e","cross_cats_sorted":["nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2015-09-15T11:34:35Z","title_canon_sha256":"77a21a4ca73fd5c2c47885111c800e6bc3a22e889da91f248ed71aa962facbc1"},"schema_version":"1.0","source":{"id":"1509.04503","kind":"arxiv","version":1}},"canonical_sha256":"702a156ba753f25e6fe908e4eb2f7a1e185b6318fee9e4a5e304c144f817f9ee","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"702a156ba753f25e6fe908e4eb2f7a1e185b6318fee9e4a5e304c144f817f9ee","first_computed_at":"2026-05-18T01:32:58.705396Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:32:58.705396Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"meuOdycNDLqlh4utIE2rxqobyjUDewwlxbImmsNAg0AfHmlQl6OqD4SswNstFd6nA2pqJtuaZWio/Fl5mWVaBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:32:58.706127Z","signed_message":"canonical_sha256_bytes"},"source_id":"1509.04503","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5dbaa9dc6694404fcfe037b5ac7251d9db26000e672beb11188224de38854016","sha256:72bb01bd0f97fc675c2e5f9209e25d0333e8dc177f8813a063b29216ff0640a1"],"state_sha256":"d40d037d88f84544da98f45d261b3ebc99e641c4f8de70d05e3b120c020876a7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"k+WfV60o2KKs5VAINaOf5a5TFI0uXwzCzfwaI5kMHVRM3RFtrRlmlCH83jZWntqm9dHX5L09mDv/agzwRKyFAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T17:16:28.940099Z","bundle_sha256":"82c9b93ed5e6fc19de825721a94aeb09870b672811e34baf427145522d8a869b"}}