{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:CYHJMXDWZO6HOJHFNFVWBTK5KA","short_pith_number":"pith:CYHJMXDW","canonical_record":{"source":{"id":"1302.6981","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-02-27T20:21:24Z","cross_cats_sorted":[],"title_canon_sha256":"ad7399d98c931628831746026b5e9b771e908ec83fbc7a793ce6017203cea657","abstract_canon_sha256":"0bf320abb1b3da8d28ecb66d313635045ea5f6ab27921f9b106fe3d36735efc1"},"schema_version":"1.0"},"canonical_sha256":"160e965c76cbbc7724e5696b60cd5d500e513480019790c8533230ec955ea589","source":{"kind":"arxiv","id":"1302.6981","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.6981","created_at":"2026-05-18T03:27:42Z"},{"alias_kind":"arxiv_version","alias_value":"1302.6981v2","created_at":"2026-05-18T03:27:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.6981","created_at":"2026-05-18T03:27:42Z"},{"alias_kind":"pith_short_12","alias_value":"CYHJMXDWZO6H","created_at":"2026-05-18T12:27:40Z"},{"alias_kind":"pith_short_16","alias_value":"CYHJMXDWZO6HOJHF","created_at":"2026-05-18T12:27:40Z"},{"alias_kind":"pith_short_8","alias_value":"CYHJMXDW","created_at":"2026-05-18T12:27:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:CYHJMXDWZO6HOJHFNFVWBTK5KA","target":"record","payload":{"canonical_record":{"source":{"id":"1302.6981","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-02-27T20:21:24Z","cross_cats_sorted":[],"title_canon_sha256":"ad7399d98c931628831746026b5e9b771e908ec83fbc7a793ce6017203cea657","abstract_canon_sha256":"0bf320abb1b3da8d28ecb66d313635045ea5f6ab27921f9b106fe3d36735efc1"},"schema_version":"1.0"},"canonical_sha256":"160e965c76cbbc7724e5696b60cd5d500e513480019790c8533230ec955ea589","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:27:42.536492Z","signature_b64":"K9yd5Nf6K7mBq0AURVjTs4XXJxiZ+jDSVboacnkyWnczg9KUcwC44IWXn8WGQnFyYc2/G3B91bZWDrHOPbq4DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"160e965c76cbbc7724e5696b60cd5d500e513480019790c8533230ec955ea589","last_reissued_at":"2026-05-18T03:27:42.535418Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:27:42.535418Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1302.6981","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":"2026-05-18T03:27:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Rq7ziiTH4Z7MJRzXmhIPYcwC/mpL8117iKnwYA4CkGZUVo3m2BjEgWpqLmKNb5z5xpTxrXMaw0aniBKsvMgdBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T18:08:06.828528Z"},"content_sha256":"f44549c8c8a9d1a63cde48b8d64d7f772703f7f4607b13713542c97d9c6d7662","schema_version":"1.0","event_id":"sha256:f44549c8c8a9d1a63cde48b8d64d7f772703f7f4607b13713542c97d9c6d7662"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:CYHJMXDWZO6HOJHFNFVWBTK5KA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the galaxy spiral arms' nature as revealed by rotation frequencies","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"B\\'arbara Pichardo, Francesca Figueras, Hector Vel\\'azquez, Merc\\`e Romero-G\\'omez, Octavio Valenzuela, Santi Roca-F\\`abrega, Teresa Antoja","submitted_at":"2013-02-27T20:21:24Z","abstract_excerpt":"High resolution N-body simulations using different codes and initial condition techniques reveal two different behaviours for the rotation frequency of transient spiral arms like structures. Whereas unbarred disks present spiral arms nearly corotatingwith disk particles, strong barred models (bulged or bulge-less) quickly develop a bar-spiral structure dominant in density, with a pattern speed almost constant in radius. As the bar strength decreases the arm departs from bar rigid rotation and behaves similar to the unbarred case. In strong barred models we detect in the frequency space other s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.6981","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":"2026-05-18T03:27:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"p7p9vNT3MoJh//uvxIFS/6qiWAsivEcQXOXUXdz0ORAAAfG4XRvLU6Wlz58YhY41qwPMI14j/6Cyo48U9L83CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T18:08:06.829170Z"},"content_sha256":"04dff1c16c59976da4687a3581683e9dafba507b294a465c7744db974ac20135","schema_version":"1.0","event_id":"sha256:04dff1c16c59976da4687a3581683e9dafba507b294a465c7744db974ac20135"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CYHJMXDWZO6HOJHFNFVWBTK5KA/bundle.json","state_url":"https://pith.science/pith/CYHJMXDWZO6HOJHFNFVWBTK5KA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CYHJMXDWZO6HOJHFNFVWBTK5KA/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":"2026-05-27T18:08:06Z","links":{"resolver":"https://pith.science/pith/CYHJMXDWZO6HOJHFNFVWBTK5KA","bundle":"https://pith.science/pith/CYHJMXDWZO6HOJHFNFVWBTK5KA/bundle.json","state":"https://pith.science/pith/CYHJMXDWZO6HOJHFNFVWBTK5KA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CYHJMXDWZO6HOJHFNFVWBTK5KA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:CYHJMXDWZO6HOJHFNFVWBTK5KA","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":"0bf320abb1b3da8d28ecb66d313635045ea5f6ab27921f9b106fe3d36735efc1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-02-27T20:21:24Z","title_canon_sha256":"ad7399d98c931628831746026b5e9b771e908ec83fbc7a793ce6017203cea657"},"schema_version":"1.0","source":{"id":"1302.6981","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.6981","created_at":"2026-05-18T03:27:42Z"},{"alias_kind":"arxiv_version","alias_value":"1302.6981v2","created_at":"2026-05-18T03:27:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.6981","created_at":"2026-05-18T03:27:42Z"},{"alias_kind":"pith_short_12","alias_value":"CYHJMXDWZO6H","created_at":"2026-05-18T12:27:40Z"},{"alias_kind":"pith_short_16","alias_value":"CYHJMXDWZO6HOJHF","created_at":"2026-05-18T12:27:40Z"},{"alias_kind":"pith_short_8","alias_value":"CYHJMXDW","created_at":"2026-05-18T12:27:40Z"}],"graph_snapshots":[{"event_id":"sha256:04dff1c16c59976da4687a3581683e9dafba507b294a465c7744db974ac20135","target":"graph","created_at":"2026-05-18T03:27:42Z","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":"High resolution N-body simulations using different codes and initial condition techniques reveal two different behaviours for the rotation frequency of transient spiral arms like structures. Whereas unbarred disks present spiral arms nearly corotatingwith disk particles, strong barred models (bulged or bulge-less) quickly develop a bar-spiral structure dominant in density, with a pattern speed almost constant in radius. As the bar strength decreases the arm departs from bar rigid rotation and behaves similar to the unbarred case. In strong barred models we detect in the frequency space other s","authors_text":"B\\'arbara Pichardo, Francesca Figueras, Hector Vel\\'azquez, Merc\\`e Romero-G\\'omez, Octavio Valenzuela, Santi Roca-F\\`abrega, Teresa Antoja","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-02-27T20:21:24Z","title":"On the galaxy spiral arms' nature as revealed by rotation frequencies"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.6981","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:f44549c8c8a9d1a63cde48b8d64d7f772703f7f4607b13713542c97d9c6d7662","target":"record","created_at":"2026-05-18T03:27:42Z","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":"0bf320abb1b3da8d28ecb66d313635045ea5f6ab27921f9b106fe3d36735efc1","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-02-27T20:21:24Z","title_canon_sha256":"ad7399d98c931628831746026b5e9b771e908ec83fbc7a793ce6017203cea657"},"schema_version":"1.0","source":{"id":"1302.6981","kind":"arxiv","version":2}},"canonical_sha256":"160e965c76cbbc7724e5696b60cd5d500e513480019790c8533230ec955ea589","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"160e965c76cbbc7724e5696b60cd5d500e513480019790c8533230ec955ea589","first_computed_at":"2026-05-18T03:27:42.535418Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:27:42.535418Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"K9yd5Nf6K7mBq0AURVjTs4XXJxiZ+jDSVboacnkyWnczg9KUcwC44IWXn8WGQnFyYc2/G3B91bZWDrHOPbq4DA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:27:42.536492Z","signed_message":"canonical_sha256_bytes"},"source_id":"1302.6981","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f44549c8c8a9d1a63cde48b8d64d7f772703f7f4607b13713542c97d9c6d7662","sha256:04dff1c16c59976da4687a3581683e9dafba507b294a465c7744db974ac20135"],"state_sha256":"fca8acc0884677f0bdbe1174f9545ebd5dfb8182ab9592c590d447e2472be3ce"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VoA9dXMDZdzG5j4b7MmuvSf1p95x+hYPZHgit8etEQ2JraKeTwHkdi1LoPYe6hoQ3KseGRlvDIW79N71BuIOBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T18:08:06.832190Z","bundle_sha256":"eab3ce9417ba15cbd7bb298dc6808fc097b76733db3e83de3c40ce49217d3270"}}