{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:LULZUID5I2VHNQC2FF6T3XWQKU","short_pith_number":"pith:LULZUID5","canonical_record":{"source":{"id":"1501.05650","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-01-22T21:00:09Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"d4f38f4e5aa803eb64cef1cb89769a0e4dafdace33ce361ad74a9a4ff6073775","abstract_canon_sha256":"d02fc4065a69d3c62e0f26aa8e7815b6555cfc8f4e5588d5cc1a6a709ad4e032"},"schema_version":"1.0"},"canonical_sha256":"5d179a207d46aa76c05a297d3dded05517f799689fecd9ff6210326c6f195b15","source":{"kind":"arxiv","id":"1501.05650","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1501.05650","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"arxiv_version","alias_value":"1501.05650v2","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.05650","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"pith_short_12","alias_value":"LULZUID5I2VH","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"LULZUID5I2VHNQC2","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"LULZUID5","created_at":"2026-05-18T12:29:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:LULZUID5I2VHNQC2FF6T3XWQKU","target":"record","payload":{"canonical_record":{"source":{"id":"1501.05650","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-01-22T21:00:09Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"d4f38f4e5aa803eb64cef1cb89769a0e4dafdace33ce361ad74a9a4ff6073775","abstract_canon_sha256":"d02fc4065a69d3c62e0f26aa8e7815b6555cfc8f4e5588d5cc1a6a709ad4e032"},"schema_version":"1.0"},"canonical_sha256":"5d179a207d46aa76c05a297d3dded05517f799689fecd9ff6210326c6f195b15","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:41:09.194283Z","signature_b64":"8m4a7Bivyk+UkAUBPV7xdrbxl/oGbhmedVb6b9tJ/0K3dabnib3CTaAnyYZP7ku2ajcvD+4sRkM/GqT25bD/AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5d179a207d46aa76c05a297d3dded05517f799689fecd9ff6210326c6f195b15","last_reissued_at":"2026-05-18T01:41:09.193590Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:41:09.193590Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1501.05650","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:41:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/IWxNpBxK31l3wvyZ9JFCId+72JBSPNRHHS36wl/ovfvyUsN+Ebcdzht/CHTNSe/2zewQg8me73EYPnTVn9wCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T15:42:55.284961Z"},"content_sha256":"8b4bf5d682ef55df925d9b6927b827dcb0ee97a16d061d0a422430fa26189f15","schema_version":"1.0","event_id":"sha256:8b4bf5d682ef55df925d9b6927b827dcb0ee97a16d061d0a422430fa26189f15"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:LULZUID5I2VHNQC2FF6T3XWQKU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The effect of dark matter resolution on the collapse of baryons in high redshift numerical simulations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"John A. Regan, John H. Wise, Peter H. Johansson","submitted_at":"2015-01-22T21:00:09Z","abstract_excerpt":"We examine the impact of dark matter particle resolution on the formation of a baryonic core in high resolution adaptive mesh refinement simulations. We test the effect that both particle smoothing and particle splitting have on the hydrodynamic properties of a collapsing halo at high redshift (z > 20). Furthermore, we vary the background field intensity, with energy below the Lyman limit (< 13.6 eV), as may be relevant for the case of metal-free star formation and super-massive black hole seed formation. We find that using particle splitting methods greatly increases our particle resolution w"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.05650","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":""},"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":"2026-05-18T01:41:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6BtDWatsWVAGy+ZOiVxUmPlt5gfLIt7irFK7yh46V0A/Sm8C39DGqw0XjmHXSBCWZgsIdvsu/7YsqG3QtjvVCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T15:42:55.285600Z"},"content_sha256":"c4cd533605e4d9940a9a3f8e6631a5c874ffeeb4f3f236c4b2fac32cbf2a3106","schema_version":"1.0","event_id":"sha256:c4cd533605e4d9940a9a3f8e6631a5c874ffeeb4f3f236c4b2fac32cbf2a3106"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LULZUID5I2VHNQC2FF6T3XWQKU/bundle.json","state_url":"https://pith.science/pith/LULZUID5I2VHNQC2FF6T3XWQKU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LULZUID5I2VHNQC2FF6T3XWQKU/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":"2026-05-26T15:42:55Z","links":{"resolver":"https://pith.science/pith/LULZUID5I2VHNQC2FF6T3XWQKU","bundle":"https://pith.science/pith/LULZUID5I2VHNQC2FF6T3XWQKU/bundle.json","state":"https://pith.science/pith/LULZUID5I2VHNQC2FF6T3XWQKU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LULZUID5I2VHNQC2FF6T3XWQKU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:LULZUID5I2VHNQC2FF6T3XWQKU","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":"d02fc4065a69d3c62e0f26aa8e7815b6555cfc8f4e5588d5cc1a6a709ad4e032","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-01-22T21:00:09Z","title_canon_sha256":"d4f38f4e5aa803eb64cef1cb89769a0e4dafdace33ce361ad74a9a4ff6073775"},"schema_version":"1.0","source":{"id":"1501.05650","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1501.05650","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"arxiv_version","alias_value":"1501.05650v2","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1501.05650","created_at":"2026-05-18T01:41:09Z"},{"alias_kind":"pith_short_12","alias_value":"LULZUID5I2VH","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"LULZUID5I2VHNQC2","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"LULZUID5","created_at":"2026-05-18T12:29:29Z"}],"graph_snapshots":[{"event_id":"sha256:c4cd533605e4d9940a9a3f8e6631a5c874ffeeb4f3f236c4b2fac32cbf2a3106","target":"graph","created_at":"2026-05-18T01:41:09Z","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 examine the impact of dark matter particle resolution on the formation of a baryonic core in high resolution adaptive mesh refinement simulations. We test the effect that both particle smoothing and particle splitting have on the hydrodynamic properties of a collapsing halo at high redshift (z > 20). Furthermore, we vary the background field intensity, with energy below the Lyman limit (< 13.6 eV), as may be relevant for the case of metal-free star formation and super-massive black hole seed formation. We find that using particle splitting methods greatly increases our particle resolution w","authors_text":"John A. Regan, John H. Wise, Peter H. Johansson","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-01-22T21:00:09Z","title":"The effect of dark matter resolution on the collapse of baryons in high redshift numerical simulations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1501.05650","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":"sha256:8b4bf5d682ef55df925d9b6927b827dcb0ee97a16d061d0a422430fa26189f15","target":"record","created_at":"2026-05-18T01:41:09Z","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":"d02fc4065a69d3c62e0f26aa8e7815b6555cfc8f4e5588d5cc1a6a709ad4e032","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-01-22T21:00:09Z","title_canon_sha256":"d4f38f4e5aa803eb64cef1cb89769a0e4dafdace33ce361ad74a9a4ff6073775"},"schema_version":"1.0","source":{"id":"1501.05650","kind":"arxiv","version":2}},"canonical_sha256":"5d179a207d46aa76c05a297d3dded05517f799689fecd9ff6210326c6f195b15","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5d179a207d46aa76c05a297d3dded05517f799689fecd9ff6210326c6f195b15","first_computed_at":"2026-05-18T01:41:09.193590Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:41:09.193590Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8m4a7Bivyk+UkAUBPV7xdrbxl/oGbhmedVb6b9tJ/0K3dabnib3CTaAnyYZP7ku2ajcvD+4sRkM/GqT25bD/AA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:41:09.194283Z","signed_message":"canonical_sha256_bytes"},"source_id":"1501.05650","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8b4bf5d682ef55df925d9b6927b827dcb0ee97a16d061d0a422430fa26189f15","sha256:c4cd533605e4d9940a9a3f8e6631a5c874ffeeb4f3f236c4b2fac32cbf2a3106"],"state_sha256":"95fd1118ebe8456a14f69e1db2c037f5631ed34c3d57a4c915b9e612dcac86a6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WtRIi/09bH5WA3YdxQuss3ljw5o8iTqlkB3oDeUOUtdHcWqN8EP/4N9Hj714O3j7cCxM5E9JTNLToePa6CzXAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T15:42:55.288112Z","bundle_sha256":"0c7bf03de6c1f3dd5555eadb875c1cecbca029cf7e6be06f753a46db01421a74"}}