{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:B3TAJR7E64GYKFHAWYEPDK3ONZ","short_pith_number":"pith:B3TAJR7E","canonical_record":{"source":{"id":"2504.16802","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-04-23T15:21:34Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"b486249b138a4bbe084ad93d02a1f450838d8d26040bc2103b4c231c450b5d1d","abstract_canon_sha256":"fc85851c2ecfd481808c473c50b7595edfea3a3aad03e876fe7fae97c4140d50"},"schema_version":"1.0"},"canonical_sha256":"0ee604c7e4f70d8514e0b608f1ab6e6e4eef2aea13531bae54b2fd35b9bbb4f7","source":{"kind":"arxiv","id":"2504.16802","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.16802","created_at":"2026-07-05T11:34:07Z"},{"alias_kind":"arxiv_version","alias_value":"2504.16802v2","created_at":"2026-07-05T11:34:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.16802","created_at":"2026-07-05T11:34:07Z"},{"alias_kind":"pith_short_12","alias_value":"B3TAJR7E64GY","created_at":"2026-07-05T11:34:07Z"},{"alias_kind":"pith_short_16","alias_value":"B3TAJR7E64GYKFHA","created_at":"2026-07-05T11:34:07Z"},{"alias_kind":"pith_short_8","alias_value":"B3TAJR7E","created_at":"2026-07-05T11:34:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:B3TAJR7E64GYKFHAWYEPDK3ONZ","target":"record","payload":{"canonical_record":{"source":{"id":"2504.16802","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-04-23T15:21:34Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"b486249b138a4bbe084ad93d02a1f450838d8d26040bc2103b4c231c450b5d1d","abstract_canon_sha256":"fc85851c2ecfd481808c473c50b7595edfea3a3aad03e876fe7fae97c4140d50"},"schema_version":"1.0"},"canonical_sha256":"0ee604c7e4f70d8514e0b608f1ab6e6e4eef2aea13531bae54b2fd35b9bbb4f7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:34:07.594553Z","signature_b64":"hiQ0bOUkSDqyvz0Hk2+y/LnZMXIUeTSBUU7guNnpN5zZMsG8LxayRNo2xCNOdFTnNWCdU1G8QDk5G25DnNJpDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0ee604c7e4f70d8514e0b608f1ab6e6e4eef2aea13531bae54b2fd35b9bbb4f7","last_reissued_at":"2026-07-05T11:34:07.594040Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:34:07.594040Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2504.16802","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":"2026-07-05T11:34:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6Ya0bVGjThk/6yYuPgUnc2BYfazsDG/P7xatC7UNYDKMxlUmMR+iZHC0g4AkUYV/ta96QDtDpUm0ZT3BC7HpAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T19:04:50.129613Z"},"content_sha256":"e814e2c1c60505785436b415e8397d649545ca4d360f56d6e5db1d6e9a576f5a","schema_version":"1.0","event_id":"sha256:e814e2c1c60505785436b415e8397d649545ca4d360f56d6e5db1d6e9a576f5a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:B3TAJR7E64GYKFHAWYEPDK3ONZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Cyclic Zoom: Multiscale GRMHD Modeling of Black Hole Accretion and Feedback","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"Eliot Quataert, James M. Stone, Minghao Guo, Volker Springel","submitted_at":"2025-04-23T15:21:34Z","abstract_excerpt":"We present a ``cyclic zoom'' method to capture the dynamics of accretion flows onto black holes across a vast range of spatial and temporal scales in general relativistic magnetohydrodynamic (GRMHD) simulations. In this method, we cyclically zoom out (derefine) and zoom in (refine) the simulation domain while using a central mask region containing a careful treatment of the coarsened fluid variables to preserve the small-scale physics, in particular the magnetic field dynamics. The method can accelerate GRMHD simulations by $\\gtrsim 10^5$ times for problems with large-scale separation. We demo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.16802","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/2504.16802/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":"2026-07-05T11:34:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uhkOdGRaS8tV8vGjOcZYHnhFrB72uJYt6ZZJZ8PP/cRq8TgyodkllxOxi8jHg3nW2R0hvvl43Qz78gatOZlcCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T19:04:50.130246Z"},"content_sha256":"d74b0f0012e9a55d31d99ffd6a7f2be72477f1ae9aa7687b65fce35a288199b1","schema_version":"1.0","event_id":"sha256:d74b0f0012e9a55d31d99ffd6a7f2be72477f1ae9aa7687b65fce35a288199b1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/B3TAJR7E64GYKFHAWYEPDK3ONZ/bundle.json","state_url":"https://pith.science/pith/B3TAJR7E64GYKFHAWYEPDK3ONZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/B3TAJR7E64GYKFHAWYEPDK3ONZ/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":"2026-08-06T19:04:50Z","links":{"resolver":"https://pith.science/pith/B3TAJR7E64GYKFHAWYEPDK3ONZ","bundle":"https://pith.science/pith/B3TAJR7E64GYKFHAWYEPDK3ONZ/bundle.json","state":"https://pith.science/pith/B3TAJR7E64GYKFHAWYEPDK3ONZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/B3TAJR7E64GYKFHAWYEPDK3ONZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:B3TAJR7E64GYKFHAWYEPDK3ONZ","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":"fc85851c2ecfd481808c473c50b7595edfea3a3aad03e876fe7fae97c4140d50","cross_cats_sorted":["astro-ph.GA"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-04-23T15:21:34Z","title_canon_sha256":"b486249b138a4bbe084ad93d02a1f450838d8d26040bc2103b4c231c450b5d1d"},"schema_version":"1.0","source":{"id":"2504.16802","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.16802","created_at":"2026-07-05T11:34:07Z"},{"alias_kind":"arxiv_version","alias_value":"2504.16802v2","created_at":"2026-07-05T11:34:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.16802","created_at":"2026-07-05T11:34:07Z"},{"alias_kind":"pith_short_12","alias_value":"B3TAJR7E64GY","created_at":"2026-07-05T11:34:07Z"},{"alias_kind":"pith_short_16","alias_value":"B3TAJR7E64GYKFHA","created_at":"2026-07-05T11:34:07Z"},{"alias_kind":"pith_short_8","alias_value":"B3TAJR7E","created_at":"2026-07-05T11:34:07Z"}],"graph_snapshots":[{"event_id":"sha256:d74b0f0012e9a55d31d99ffd6a7f2be72477f1ae9aa7687b65fce35a288199b1","target":"graph","created_at":"2026-07-05T11:34:07Z","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/2504.16802/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a ``cyclic zoom'' method to capture the dynamics of accretion flows onto black holes across a vast range of spatial and temporal scales in general relativistic magnetohydrodynamic (GRMHD) simulations. In this method, we cyclically zoom out (derefine) and zoom in (refine) the simulation domain while using a central mask region containing a careful treatment of the coarsened fluid variables to preserve the small-scale physics, in particular the magnetic field dynamics. The method can accelerate GRMHD simulations by $\\gtrsim 10^5$ times for problems with large-scale separation. We demo","authors_text":"Eliot Quataert, James M. Stone, Minghao Guo, Volker Springel","cross_cats":["astro-ph.GA"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-04-23T15:21:34Z","title":"Cyclic Zoom: Multiscale GRMHD Modeling of Black Hole Accretion and Feedback"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.16802","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:e814e2c1c60505785436b415e8397d649545ca4d360f56d6e5db1d6e9a576f5a","target":"record","created_at":"2026-07-05T11:34:07Z","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":"fc85851c2ecfd481808c473c50b7595edfea3a3aad03e876fe7fae97c4140d50","cross_cats_sorted":["astro-ph.GA"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-04-23T15:21:34Z","title_canon_sha256":"b486249b138a4bbe084ad93d02a1f450838d8d26040bc2103b4c231c450b5d1d"},"schema_version":"1.0","source":{"id":"2504.16802","kind":"arxiv","version":2}},"canonical_sha256":"0ee604c7e4f70d8514e0b608f1ab6e6e4eef2aea13531bae54b2fd35b9bbb4f7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0ee604c7e4f70d8514e0b608f1ab6e6e4eef2aea13531bae54b2fd35b9bbb4f7","first_computed_at":"2026-07-05T11:34:07.594040Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:34:07.594040Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hiQ0bOUkSDqyvz0Hk2+y/LnZMXIUeTSBUU7guNnpN5zZMsG8LxayRNo2xCNOdFTnNWCdU1G8QDk5G25DnNJpDw==","signature_status":"signed_v1","signed_at":"2026-07-05T11:34:07.594553Z","signed_message":"canonical_sha256_bytes"},"source_id":"2504.16802","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e814e2c1c60505785436b415e8397d649545ca4d360f56d6e5db1d6e9a576f5a","sha256:d74b0f0012e9a55d31d99ffd6a7f2be72477f1ae9aa7687b65fce35a288199b1"],"state_sha256":"59aac3a7c99f1655005622dc99723dfb70765ff0a43ba949ff57d18380c6cf07"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EZXuJekQHV4YpMZPPQg1T4vvO3Ogj1ImVFeg7nNYC01YCndtq4ljsXhCCJR74nJZjPOdyi5uRJaG9leF8hn6Bw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T19:04:50.136458Z","bundle_sha256":"5a8959bb3a840f084fb3a2ff439bd2a620a76ade8357e82d27d3e2e5d323e013"}}