{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:UWJI36EFAA43FKGFJAQJDKO44J","short_pith_number":"pith:UWJI36EF","canonical_record":{"source":{"id":"2607.12146","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2026-07-13T20:54:15Z","cross_cats_sorted":[],"title_canon_sha256":"2d584a2fe95e44f7050a7b24eac3f7d58ec81b4d74fb5b700228a26c0cf824d4","abstract_canon_sha256":"db5629334a323bebe738464eb9e02203a447f7a44449f5d4b9c72a059bfbfc07"},"schema_version":"1.0"},"canonical_sha256":"a5928df8850039b2a8c5482091a9dce2691c47e2352d6b143ab238a60fd387b1","source":{"kind":"arxiv","id":"2607.12146","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.12146","created_at":"2026-07-15T00:21:35Z"},{"alias_kind":"arxiv_version","alias_value":"2607.12146v1","created_at":"2026-07-15T00:21:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.12146","created_at":"2026-07-15T00:21:35Z"},{"alias_kind":"pith_short_12","alias_value":"UWJI36EFAA43","created_at":"2026-07-15T00:21:35Z"},{"alias_kind":"pith_short_16","alias_value":"UWJI36EFAA43FKGF","created_at":"2026-07-15T00:21:35Z"},{"alias_kind":"pith_short_8","alias_value":"UWJI36EF","created_at":"2026-07-15T00:21:35Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:UWJI36EFAA43FKGFJAQJDKO44J","target":"record","payload":{"canonical_record":{"source":{"id":"2607.12146","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2026-07-13T20:54:15Z","cross_cats_sorted":[],"title_canon_sha256":"2d584a2fe95e44f7050a7b24eac3f7d58ec81b4d74fb5b700228a26c0cf824d4","abstract_canon_sha256":"db5629334a323bebe738464eb9e02203a447f7a44449f5d4b9c72a059bfbfc07"},"schema_version":"1.0"},"canonical_sha256":"a5928df8850039b2a8c5482091a9dce2691c47e2352d6b143ab238a60fd387b1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-15T00:21:35.500644Z","signature_b64":"nrq6GWAnZeWfzYQ2V3N+cJ0HLLCunkyrlsFoGeYVE+SxQnFUPehgQTonDGlfAZV/Y6kXKrtekvHadaEJnfJiBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a5928df8850039b2a8c5482091a9dce2691c47e2352d6b143ab238a60fd387b1","last_reissued_at":"2026-07-15T00:21:35.499768Z","signature_status":"signed_v1","first_computed_at":"2026-07-15T00:21:35.499768Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2607.12146","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":"2026-07-15T00:21:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ks1jmBMGrCgYx+yY9MV5ClOS9Xytyuh6Jmqg1lXkeMfCXzzXHqBdlLG+oFfPeWx9Y2Cxat6RPCkBDo49NaPZDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-29T07:03:45.535256Z"},"content_sha256":"c6a66636f9a462a211ec8ffbcb1b419f0e6e3f2e41a13b28db857527d054be81","schema_version":"1.0","event_id":"sha256:c6a66636f9a462a211ec8ffbcb1b419f0e6e3f2e41a13b28db857527d054be81"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:UWJI36EFAA43FKGFJAQJDKO44J","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A differentiable hydrodynamical approach to the Milky Way bar pattern speed with CO longitude--velocity data","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Junichi Baba (Kagoshima U./NAOJ), Kohei Hattori (NAOJ)","submitted_at":"2026-07-13T20:54:15Z","abstract_excerpt":"We present a differentiable hydrodynamical framework for modeling barred gas flow in the Milky Way and constraining broad low-loss regions in bar-pattern-speed parameter space from Galactic longitude--velocity data. The method evolves a neutral-gas disk in a fixed barred potential, projects it into longitude--velocity ($\\ell$--$v$) space, and compares predicted and target maps using a cosine-distance loss applied to processed and masked maps. This emphasizes large-scale morphology rather than the absolute emission scale. Because the forward model is differentiable, gradients with respect to th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.12146","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/2607.12146/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":"2026-07-15T00:21:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HNN9IEY7X9gSyMHFYW32e3cdbzcgCZNWsm0BAFuQsdgKB+zbOq1y4USuspF7Ksbmumb0pr6zUb4aoEmeKk94Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-29T07:03:45.535656Z"},"content_sha256":"bf313a3e524d425e3f31fb58aeeb7ef3aacde73783723c73541d9dbd5f618950","schema_version":"1.0","event_id":"sha256:bf313a3e524d425e3f31fb58aeeb7ef3aacde73783723c73541d9dbd5f618950"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UWJI36EFAA43FKGFJAQJDKO44J/bundle.json","state_url":"https://pith.science/pith/UWJI36EFAA43FKGFJAQJDKO44J/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UWJI36EFAA43FKGFJAQJDKO44J/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":"2026-07-29T07:03:45Z","links":{"resolver":"https://pith.science/pith/UWJI36EFAA43FKGFJAQJDKO44J","bundle":"https://pith.science/pith/UWJI36EFAA43FKGFJAQJDKO44J/bundle.json","state":"https://pith.science/pith/UWJI36EFAA43FKGFJAQJDKO44J/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UWJI36EFAA43FKGFJAQJDKO44J/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:UWJI36EFAA43FKGFJAQJDKO44J","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":"db5629334a323bebe738464eb9e02203a447f7a44449f5d4b9c72a059bfbfc07","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2026-07-13T20:54:15Z","title_canon_sha256":"2d584a2fe95e44f7050a7b24eac3f7d58ec81b4d74fb5b700228a26c0cf824d4"},"schema_version":"1.0","source":{"id":"2607.12146","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.12146","created_at":"2026-07-15T00:21:35Z"},{"alias_kind":"arxiv_version","alias_value":"2607.12146v1","created_at":"2026-07-15T00:21:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.12146","created_at":"2026-07-15T00:21:35Z"},{"alias_kind":"pith_short_12","alias_value":"UWJI36EFAA43","created_at":"2026-07-15T00:21:35Z"},{"alias_kind":"pith_short_16","alias_value":"UWJI36EFAA43FKGF","created_at":"2026-07-15T00:21:35Z"},{"alias_kind":"pith_short_8","alias_value":"UWJI36EF","created_at":"2026-07-15T00:21:35Z"}],"graph_snapshots":[{"event_id":"sha256:bf313a3e524d425e3f31fb58aeeb7ef3aacde73783723c73541d9dbd5f618950","target":"graph","created_at":"2026-07-15T00:21:35Z","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/2607.12146/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a differentiable hydrodynamical framework for modeling barred gas flow in the Milky Way and constraining broad low-loss regions in bar-pattern-speed parameter space from Galactic longitude--velocity data. The method evolves a neutral-gas disk in a fixed barred potential, projects it into longitude--velocity ($\\ell$--$v$) space, and compares predicted and target maps using a cosine-distance loss applied to processed and masked maps. This emphasizes large-scale morphology rather than the absolute emission scale. Because the forward model is differentiable, gradients with respect to th","authors_text":"Junichi Baba (Kagoshima U./NAOJ), Kohei Hattori (NAOJ)","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2026-07-13T20:54:15Z","title":"A differentiable hydrodynamical approach to the Milky Way bar pattern speed with CO longitude--velocity data"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.12146","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:c6a66636f9a462a211ec8ffbcb1b419f0e6e3f2e41a13b28db857527d054be81","target":"record","created_at":"2026-07-15T00:21:35Z","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":"db5629334a323bebe738464eb9e02203a447f7a44449f5d4b9c72a059bfbfc07","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2026-07-13T20:54:15Z","title_canon_sha256":"2d584a2fe95e44f7050a7b24eac3f7d58ec81b4d74fb5b700228a26c0cf824d4"},"schema_version":"1.0","source":{"id":"2607.12146","kind":"arxiv","version":1}},"canonical_sha256":"a5928df8850039b2a8c5482091a9dce2691c47e2352d6b143ab238a60fd387b1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a5928df8850039b2a8c5482091a9dce2691c47e2352d6b143ab238a60fd387b1","first_computed_at":"2026-07-15T00:21:35.499768Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-15T00:21:35.499768Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nrq6GWAnZeWfzYQ2V3N+cJ0HLLCunkyrlsFoGeYVE+SxQnFUPehgQTonDGlfAZV/Y6kXKrtekvHadaEJnfJiBw==","signature_status":"signed_v1","signed_at":"2026-07-15T00:21:35.500644Z","signed_message":"canonical_sha256_bytes"},"source_id":"2607.12146","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c6a66636f9a462a211ec8ffbcb1b419f0e6e3f2e41a13b28db857527d054be81","sha256:bf313a3e524d425e3f31fb58aeeb7ef3aacde73783723c73541d9dbd5f618950"],"state_sha256":"6200ee00ffe17b2a00e18f270c32e74a5bd2db091994ad8401b1a31f53e274dd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"K4t6q7LBZ0VudoDx8u6pHuoMSxtdMnijilpvFbF9F3U2iQ1mGSad3yC6Ep3+L9Lf5rG2jLzOJmg5QaXQV+DbBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-29T07:03:45.538037Z","bundle_sha256":"64cb6206daa839c6c60244151b9ccc85f990743eeaeb46fd8c5eca684c11505f"}}