{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:7ZBXAHRG7UD5UFZ4V7SN4HYVAF","short_pith_number":"pith:7ZBXAHRG","canonical_record":{"source":{"id":"2507.21991","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-07-29T16:43:06Z","cross_cats_sorted":[],"title_canon_sha256":"0f0f583ab9798a71e4bf7aa0262cce132fd7269482a73f64b67243e14aeaada3","abstract_canon_sha256":"f693dbb4ea2be6c0a6f2e1c91156d12640a26c0dac83fc4ef925d28066a164e5"},"schema_version":"1.0"},"canonical_sha256":"fe43701e26fd07da173cafe4de1f150163d73aa82f77780bd845010d94d80bb4","source":{"kind":"arxiv","id":"2507.21991","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.21991","created_at":"2026-07-05T11:45:11Z"},{"alias_kind":"arxiv_version","alias_value":"2507.21991v1","created_at":"2026-07-05T11:45:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.21991","created_at":"2026-07-05T11:45:11Z"},{"alias_kind":"pith_short_12","alias_value":"7ZBXAHRG7UD5","created_at":"2026-07-05T11:45:11Z"},{"alias_kind":"pith_short_16","alias_value":"7ZBXAHRG7UD5UFZ4","created_at":"2026-07-05T11:45:11Z"},{"alias_kind":"pith_short_8","alias_value":"7ZBXAHRG","created_at":"2026-07-05T11:45:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:7ZBXAHRG7UD5UFZ4V7SN4HYVAF","target":"record","payload":{"canonical_record":{"source":{"id":"2507.21991","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-07-29T16:43:06Z","cross_cats_sorted":[],"title_canon_sha256":"0f0f583ab9798a71e4bf7aa0262cce132fd7269482a73f64b67243e14aeaada3","abstract_canon_sha256":"f693dbb4ea2be6c0a6f2e1c91156d12640a26c0dac83fc4ef925d28066a164e5"},"schema_version":"1.0"},"canonical_sha256":"fe43701e26fd07da173cafe4de1f150163d73aa82f77780bd845010d94d80bb4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:45:11.087187Z","signature_b64":"2MrxC6KgNo2CDTYWt6ZRAN/7b6hM2WkVNnAUZaFd3zM9tc+kXdRKKL25a5sI3AX7NBGgPeK+06sVo+5iLB7FBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fe43701e26fd07da173cafe4de1f150163d73aa82f77780bd845010d94d80bb4","last_reissued_at":"2026-07-05T11:45:11.086786Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:45:11.086786Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2507.21991","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":"2026-07-05T11:45:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"piLRZhfII7mm353KF8sKv6BexHeqCvGmVElU1KD2eJZ0IW+LzU/qSe89IXPVDOB5cC5h3z7erHKCnNPRl46XBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-17T23:27:12.784193Z"},"content_sha256":"f8de547eda94e7b2f805f453608eb67f3c71410117983e5135bcb4e4b8a3fdc0","schema_version":"1.0","event_id":"sha256:f8de547eda94e7b2f805f453608eb67f3c71410117983e5135bcb4e4b8a3fdc0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:7ZBXAHRG7UD5UFZ4V7SN4HYVAF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Does magnetic field promote or suppress fragmentation in AGN disks? Results from local shearing box simulations with simple cooling","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Hannalore J. Gerling-Dunsmore, Mitchell C. Begelman, Philip J. Armitage, Tsun Hin Navin Tsung, Yan-Fei Jiang","submitted_at":"2025-07-29T16:43:06Z","abstract_excerpt":"Accretion disks in Active Galactic Nuclei (AGN) are predicted to become gravitationally unstable substantially interior to the black hole's sphere of influence, at radii where the disk is simultaneously unstable to the magnetorotational instability (MRI). Using local shearing box simulations with net vertical flux and a simple cooling prescription, we investigate the effect of magnetic fields on fragmentation in the limit of ideal magnetohydrodyamics. Different levels of in-disk magnetic field from the magnetorotational instability are generated by varying the initial vertical-field plasma bet"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.21991","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/2507.21991/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":"2026-07-05T11:45:11Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wgxSnNyfL+48b1iqd18zsgBposlvUtA2oIqVdNeoA9zY5SjvwmttWsgjRHBRRlqgzrhNGaw/FiUqMUPmkXI0Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-17T23:27:12.785081Z"},"content_sha256":"c199c716b848bc0dae9e6694b1581555cbdd078fd16b7b5314f60aad52000c66","schema_version":"1.0","event_id":"sha256:c199c716b848bc0dae9e6694b1581555cbdd078fd16b7b5314f60aad52000c66"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7ZBXAHRG7UD5UFZ4V7SN4HYVAF/bundle.json","state_url":"https://pith.science/pith/7ZBXAHRG7UD5UFZ4V7SN4HYVAF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7ZBXAHRG7UD5UFZ4V7SN4HYVAF/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":"2026-08-17T23:27:12Z","links":{"resolver":"https://pith.science/pith/7ZBXAHRG7UD5UFZ4V7SN4HYVAF","bundle":"https://pith.science/pith/7ZBXAHRG7UD5UFZ4V7SN4HYVAF/bundle.json","state":"https://pith.science/pith/7ZBXAHRG7UD5UFZ4V7SN4HYVAF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7ZBXAHRG7UD5UFZ4V7SN4HYVAF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:7ZBXAHRG7UD5UFZ4V7SN4HYVAF","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":"f693dbb4ea2be6c0a6f2e1c91156d12640a26c0dac83fc4ef925d28066a164e5","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-07-29T16:43:06Z","title_canon_sha256":"0f0f583ab9798a71e4bf7aa0262cce132fd7269482a73f64b67243e14aeaada3"},"schema_version":"1.0","source":{"id":"2507.21991","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.21991","created_at":"2026-07-05T11:45:11Z"},{"alias_kind":"arxiv_version","alias_value":"2507.21991v1","created_at":"2026-07-05T11:45:11Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.21991","created_at":"2026-07-05T11:45:11Z"},{"alias_kind":"pith_short_12","alias_value":"7ZBXAHRG7UD5","created_at":"2026-07-05T11:45:11Z"},{"alias_kind":"pith_short_16","alias_value":"7ZBXAHRG7UD5UFZ4","created_at":"2026-07-05T11:45:11Z"},{"alias_kind":"pith_short_8","alias_value":"7ZBXAHRG","created_at":"2026-07-05T11:45:11Z"}],"graph_snapshots":[{"event_id":"sha256:c199c716b848bc0dae9e6694b1581555cbdd078fd16b7b5314f60aad52000c66","target":"graph","created_at":"2026-07-05T11:45:11Z","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/2507.21991/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Accretion disks in Active Galactic Nuclei (AGN) are predicted to become gravitationally unstable substantially interior to the black hole's sphere of influence, at radii where the disk is simultaneously unstable to the magnetorotational instability (MRI). Using local shearing box simulations with net vertical flux and a simple cooling prescription, we investigate the effect of magnetic fields on fragmentation in the limit of ideal magnetohydrodyamics. Different levels of in-disk magnetic field from the magnetorotational instability are generated by varying the initial vertical-field plasma bet","authors_text":"Hannalore J. Gerling-Dunsmore, Mitchell C. Begelman, Philip J. Armitage, Tsun Hin Navin Tsung, Yan-Fei Jiang","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-07-29T16:43:06Z","title":"Does magnetic field promote or suppress fragmentation in AGN disks? Results from local shearing box simulations with simple cooling"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.21991","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:f8de547eda94e7b2f805f453608eb67f3c71410117983e5135bcb4e4b8a3fdc0","target":"record","created_at":"2026-07-05T11:45:11Z","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":"f693dbb4ea2be6c0a6f2e1c91156d12640a26c0dac83fc4ef925d28066a164e5","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-07-29T16:43:06Z","title_canon_sha256":"0f0f583ab9798a71e4bf7aa0262cce132fd7269482a73f64b67243e14aeaada3"},"schema_version":"1.0","source":{"id":"2507.21991","kind":"arxiv","version":1}},"canonical_sha256":"fe43701e26fd07da173cafe4de1f150163d73aa82f77780bd845010d94d80bb4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fe43701e26fd07da173cafe4de1f150163d73aa82f77780bd845010d94d80bb4","first_computed_at":"2026-07-05T11:45:11.086786Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:45:11.086786Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"2MrxC6KgNo2CDTYWt6ZRAN/7b6hM2WkVNnAUZaFd3zM9tc+kXdRKKL25a5sI3AX7NBGgPeK+06sVo+5iLB7FBw==","signature_status":"signed_v1","signed_at":"2026-07-05T11:45:11.087187Z","signed_message":"canonical_sha256_bytes"},"source_id":"2507.21991","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f8de547eda94e7b2f805f453608eb67f3c71410117983e5135bcb4e4b8a3fdc0","sha256:c199c716b848bc0dae9e6694b1581555cbdd078fd16b7b5314f60aad52000c66"],"state_sha256":"b1f67e4bde8cb23b4114c1fe3d818a845b5a3ba51dd57dbcfd76cd92d95f1ec2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"t7chvBDXvHnwsVjP9d33UiezF5rCEcpzCs1Rp32tqbKHLwjOn9eDGjaYV0Dg3A+yDJAKagtMjQRqUomfQ4jvAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-17T23:27:12.791888Z","bundle_sha256":"bd44baa29a007acda5fb71f00e53306854153cca4158d159e53bd1a2d65e6997"}}