{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:ODYLV3P6A2M6Y2RM3DWPZXLW3Q","short_pith_number":"pith:ODYLV3P6","canonical_record":{"source":{"id":"2501.07626","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2025-01-13T19:00:00Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"43560f90bbe0e5e5de3f453adcd3e4ff848b2aaf735966d4eb1450a36ee53a5c","abstract_canon_sha256":"2abf76ffac5da086892cd550becfa72ba258d7211229109a4a10ff2e96b801e9"},"schema_version":"1.0"},"canonical_sha256":"70f0baedfe0699ec6a2cd8ecfcdd76dc17ac8fd5d5e0c4e48c05f39d5dee95d1","source":{"kind":"arxiv","id":"2501.07626","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2501.07626","created_at":"2026-07-05T11:59:56Z"},{"alias_kind":"arxiv_version","alias_value":"2501.07626v2","created_at":"2026-07-05T11:59:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2501.07626","created_at":"2026-07-05T11:59:56Z"},{"alias_kind":"pith_short_12","alias_value":"ODYLV3P6A2M6","created_at":"2026-07-05T11:59:56Z"},{"alias_kind":"pith_short_16","alias_value":"ODYLV3P6A2M6Y2RM","created_at":"2026-07-05T11:59:56Z"},{"alias_kind":"pith_short_8","alias_value":"ODYLV3P6","created_at":"2026-07-05T11:59:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:ODYLV3P6A2M6Y2RM3DWPZXLW3Q","target":"record","payload":{"canonical_record":{"source":{"id":"2501.07626","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2025-01-13T19:00:00Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"43560f90bbe0e5e5de3f453adcd3e4ff848b2aaf735966d4eb1450a36ee53a5c","abstract_canon_sha256":"2abf76ffac5da086892cd550becfa72ba258d7211229109a4a10ff2e96b801e9"},"schema_version":"1.0"},"canonical_sha256":"70f0baedfe0699ec6a2cd8ecfcdd76dc17ac8fd5d5e0c4e48c05f39d5dee95d1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:59:56.742793Z","signature_b64":"856LC/5e1hEDYuecZbTimc0mNZdOIcJx35XglfHejehza/v28NqTwNIRMJj6FB/O4MXwSy/e3NRaTytXLF+VCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"70f0baedfe0699ec6a2cd8ecfcdd76dc17ac8fd5d5e0c4e48c05f39d5dee95d1","last_reissued_at":"2026-07-05T11:59:56.742363Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:59:56.742363Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2501.07626","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":"2026-07-05T11:59:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"923Nla6IA9mHZwG5t9rf76cKXH8jvYzlbBUb6w/UW/XOX84QTE//fX2H5VE1xvMO+YaMeHSMcIlFwwB+A0wmAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T06:03:22.945839Z"},"content_sha256":"7bb00f0be6ce2d20e2992049d77dea25112796d85ffec5e717deba2b04a6b6c6","schema_version":"1.0","event_id":"sha256:7bb00f0be6ce2d20e2992049d77dea25112796d85ffec5e717deba2b04a6b6c6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:ODYLV3P6A2M6Y2RM3DWPZXLW3Q","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Protostellar disc structure and dynamics during star formation from cloud-scale initial conditions","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"Christoph Federrath, Trey Qingyun Yang","submitted_at":"2025-01-13T19:00:00Z","abstract_excerpt":"The early evolution of protostellar, star-forming discs, including their density structure, turbulence, magnetic dynamics, and accretion variability, remains poorly understood. We present high-resolution magnetohydrodynamic simulations, using adaptive mesh refinement to capture detailed disc dynamics down to sub-AU scales. Starting from initial conditions derived from a molecular cloud simulation, we model the collapse of a dense core into a protostellar disc over 10,000 yr following sink particle (star) formation, achieving a maximum effective resolution of 0.63 AU. This simulation traces the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2501.07626","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2501.07626/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":"2026-07-05T11:59:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"u+AjxjEHAo9mgASqlzu0nvmQ6A0NrEdsGDoqLgae1Vs4S6PmEsDkXoLHim89VyHsDFD9sIUSalXta+s+LOzqAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-20T06:03:22.946350Z"},"content_sha256":"3d7eba35dbea06e86e393dc863eeea91e8652d49e9f0a0d8f65f4a389f2a1e4a","schema_version":"1.0","event_id":"sha256:3d7eba35dbea06e86e393dc863eeea91e8652d49e9f0a0d8f65f4a389f2a1e4a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ODYLV3P6A2M6Y2RM3DWPZXLW3Q/bundle.json","state_url":"https://pith.science/pith/ODYLV3P6A2M6Y2RM3DWPZXLW3Q/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ODYLV3P6A2M6Y2RM3DWPZXLW3Q/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":"2026-08-20T06:03:22Z","links":{"resolver":"https://pith.science/pith/ODYLV3P6A2M6Y2RM3DWPZXLW3Q","bundle":"https://pith.science/pith/ODYLV3P6A2M6Y2RM3DWPZXLW3Q/bundle.json","state":"https://pith.science/pith/ODYLV3P6A2M6Y2RM3DWPZXLW3Q/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ODYLV3P6A2M6Y2RM3DWPZXLW3Q/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:ODYLV3P6A2M6Y2RM3DWPZXLW3Q","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":"2abf76ffac5da086892cd550becfa72ba258d7211229109a4a10ff2e96b801e9","cross_cats_sorted":["astro-ph.GA"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2025-01-13T19:00:00Z","title_canon_sha256":"43560f90bbe0e5e5de3f453adcd3e4ff848b2aaf735966d4eb1450a36ee53a5c"},"schema_version":"1.0","source":{"id":"2501.07626","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2501.07626","created_at":"2026-07-05T11:59:56Z"},{"alias_kind":"arxiv_version","alias_value":"2501.07626v2","created_at":"2026-07-05T11:59:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2501.07626","created_at":"2026-07-05T11:59:56Z"},{"alias_kind":"pith_short_12","alias_value":"ODYLV3P6A2M6","created_at":"2026-07-05T11:59:56Z"},{"alias_kind":"pith_short_16","alias_value":"ODYLV3P6A2M6Y2RM","created_at":"2026-07-05T11:59:56Z"},{"alias_kind":"pith_short_8","alias_value":"ODYLV3P6","created_at":"2026-07-05T11:59:56Z"}],"graph_snapshots":[{"event_id":"sha256:3d7eba35dbea06e86e393dc863eeea91e8652d49e9f0a0d8f65f4a389f2a1e4a","target":"graph","created_at":"2026-07-05T11:59:56Z","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/2501.07626/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The early evolution of protostellar, star-forming discs, including their density structure, turbulence, magnetic dynamics, and accretion variability, remains poorly understood. We present high-resolution magnetohydrodynamic simulations, using adaptive mesh refinement to capture detailed disc dynamics down to sub-AU scales. Starting from initial conditions derived from a molecular cloud simulation, we model the collapse of a dense core into a protostellar disc over 10,000 yr following sink particle (star) formation, achieving a maximum effective resolution of 0.63 AU. This simulation traces the","authors_text":"Christoph Federrath, Trey Qingyun Yang","cross_cats":["astro-ph.GA"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2025-01-13T19:00:00Z","title":"Protostellar disc structure and dynamics during star formation from cloud-scale initial conditions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2501.07626","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":"sha256:7bb00f0be6ce2d20e2992049d77dea25112796d85ffec5e717deba2b04a6b6c6","target":"record","created_at":"2026-07-05T11:59:56Z","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":"2abf76ffac5da086892cd550becfa72ba258d7211229109a4a10ff2e96b801e9","cross_cats_sorted":["astro-ph.GA"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.SR","submitted_at":"2025-01-13T19:00:00Z","title_canon_sha256":"43560f90bbe0e5e5de3f453adcd3e4ff848b2aaf735966d4eb1450a36ee53a5c"},"schema_version":"1.0","source":{"id":"2501.07626","kind":"arxiv","version":2}},"canonical_sha256":"70f0baedfe0699ec6a2cd8ecfcdd76dc17ac8fd5d5e0c4e48c05f39d5dee95d1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"70f0baedfe0699ec6a2cd8ecfcdd76dc17ac8fd5d5e0c4e48c05f39d5dee95d1","first_computed_at":"2026-07-05T11:59:56.742363Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:59:56.742363Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"856LC/5e1hEDYuecZbTimc0mNZdOIcJx35XglfHejehza/v28NqTwNIRMJj6FB/O4MXwSy/e3NRaTytXLF+VCA==","signature_status":"signed_v1","signed_at":"2026-07-05T11:59:56.742793Z","signed_message":"canonical_sha256_bytes"},"source_id":"2501.07626","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7bb00f0be6ce2d20e2992049d77dea25112796d85ffec5e717deba2b04a6b6c6","sha256:3d7eba35dbea06e86e393dc863eeea91e8652d49e9f0a0d8f65f4a389f2a1e4a"],"state_sha256":"133737731bfa8140321c85ad5e9b0bfa467af2d8743b1f3910767c989c87d701"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"704q5psKLvL7ofgmIwFAh8SDMkqO4tmcmW+C2/LMdjSYsZAcSTi6em7aqpWBWDc5HW5ipcWQQnPERk22xgDWDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-20T06:03:22.950314Z","bundle_sha256":"831f9ed845a97feb89e3dd8295b3b986a35c95817010a0572f3c3ff24bfd438c"}}