{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:ENGKCKVEUYP2G6K3GRDZM5KSQE","short_pith_number":"pith:ENGKCKVE","canonical_record":{"source":{"id":"1408.3670","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-08-15T22:42:02Z","cross_cats_sorted":[],"title_canon_sha256":"18611ec8c69598076ec216ce6a61658c0e507c0aa0570f956568cec4885d2ae8","abstract_canon_sha256":"99d1f0105046ad1480e2e009669d3ec66c45900e80de3d53f6da209da9c84c81"},"schema_version":"1.0"},"canonical_sha256":"234ca12aa4a61fa3795b34479675528117b866aa7d7232eeb86ea67aa87c583b","source":{"kind":"arxiv","id":"1408.3670","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1408.3670","created_at":"2026-05-18T00:50:48Z"},{"alias_kind":"arxiv_version","alias_value":"1408.3670v1","created_at":"2026-05-18T00:50:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1408.3670","created_at":"2026-05-18T00:50:48Z"},{"alias_kind":"pith_short_12","alias_value":"ENGKCKVEUYP2","created_at":"2026-05-18T12:28:28Z"},{"alias_kind":"pith_short_16","alias_value":"ENGKCKVEUYP2G6K3","created_at":"2026-05-18T12:28:28Z"},{"alias_kind":"pith_short_8","alias_value":"ENGKCKVE","created_at":"2026-05-18T12:28:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:ENGKCKVEUYP2G6K3GRDZM5KSQE","target":"record","payload":{"canonical_record":{"source":{"id":"1408.3670","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-08-15T22:42:02Z","cross_cats_sorted":[],"title_canon_sha256":"18611ec8c69598076ec216ce6a61658c0e507c0aa0570f956568cec4885d2ae8","abstract_canon_sha256":"99d1f0105046ad1480e2e009669d3ec66c45900e80de3d53f6da209da9c84c81"},"schema_version":"1.0"},"canonical_sha256":"234ca12aa4a61fa3795b34479675528117b866aa7d7232eeb86ea67aa87c583b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:50:48.255872Z","signature_b64":"IOpE2CX4fFsIMCR8lqAtfEIR86/B9JydCGyJNlCa80eG2bHtBdA+ac89keVZ9PUdprLZDk4121RJ27VMZPa8Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"234ca12aa4a61fa3795b34479675528117b866aa7d7232eeb86ea67aa87c583b","last_reissued_at":"2026-05-18T00:50:48.255219Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:50:48.255219Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1408.3670","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":"2026-05-18T00:50:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EtL6OyZneJmqQRVsmXcloIgO3Ncupdjjk8TJwv+ADxMf48nGBaTjPfEg1I9X5bOKoCcsSXvb3gg+AwfVObktDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T18:48:53.367598Z"},"content_sha256":"70bce51cf7fdad27bb105b95b214af6aa7b166942d16ffcb91de3f8e2bffeeeb","schema_version":"1.0","event_id":"sha256:70bce51cf7fdad27bb105b95b214af6aa7b166942d16ffcb91de3f8e2bffeeeb"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:ENGKCKVEUYP2G6K3GRDZM5KSQE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Analysis of the spiral structure in a simulated galaxy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Dolores Mata-Ch\\'avez, Gilberto C. G\\'omez, Iv\\^anio Puerari","submitted_at":"2014-08-15T22:42:02Z","abstract_excerpt":"We analyze the spiral structure that results in a numerical simulation of a galactic disk with stellar and gaseous components evolving in a potential that includes an axisymmetric halo and bulge. We perform a second simulation without the gas component to observe how it affects the spiral structure in the disk. To quantify this, we use a Fourier analysis and obtain values for the pitch angle and the velocity of the self-excited spiral pattern of the disk. The results show a tighter spiral in the simulation with gaseous component. The spiral structure is consistent with a superposition of waves"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1408.3670","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":""},"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":"2026-05-18T00:50:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BMi+7e/JTOPodKo3mj7gwno2ph/3ml6O2EbZxtjolrm4Wz+WeRadVsKGlX8fF231Id0COiieQJThMydPG1aACQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T18:48:53.367992Z"},"content_sha256":"dfd8e45d53e38fc256f20d6ebdfcacf162dfc92c6560ec4f5d06b44703ad0154","schema_version":"1.0","event_id":"sha256:dfd8e45d53e38fc256f20d6ebdfcacf162dfc92c6560ec4f5d06b44703ad0154"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ENGKCKVEUYP2G6K3GRDZM5KSQE/bundle.json","state_url":"https://pith.science/pith/ENGKCKVEUYP2G6K3GRDZM5KSQE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ENGKCKVEUYP2G6K3GRDZM5KSQE/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":"2026-05-29T18:48:53Z","links":{"resolver":"https://pith.science/pith/ENGKCKVEUYP2G6K3GRDZM5KSQE","bundle":"https://pith.science/pith/ENGKCKVEUYP2G6K3GRDZM5KSQE/bundle.json","state":"https://pith.science/pith/ENGKCKVEUYP2G6K3GRDZM5KSQE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ENGKCKVEUYP2G6K3GRDZM5KSQE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:ENGKCKVEUYP2G6K3GRDZM5KSQE","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":"99d1f0105046ad1480e2e009669d3ec66c45900e80de3d53f6da209da9c84c81","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-08-15T22:42:02Z","title_canon_sha256":"18611ec8c69598076ec216ce6a61658c0e507c0aa0570f956568cec4885d2ae8"},"schema_version":"1.0","source":{"id":"1408.3670","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1408.3670","created_at":"2026-05-18T00:50:48Z"},{"alias_kind":"arxiv_version","alias_value":"1408.3670v1","created_at":"2026-05-18T00:50:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1408.3670","created_at":"2026-05-18T00:50:48Z"},{"alias_kind":"pith_short_12","alias_value":"ENGKCKVEUYP2","created_at":"2026-05-18T12:28:28Z"},{"alias_kind":"pith_short_16","alias_value":"ENGKCKVEUYP2G6K3","created_at":"2026-05-18T12:28:28Z"},{"alias_kind":"pith_short_8","alias_value":"ENGKCKVE","created_at":"2026-05-18T12:28:28Z"}],"graph_snapshots":[{"event_id":"sha256:dfd8e45d53e38fc256f20d6ebdfcacf162dfc92c6560ec4f5d06b44703ad0154","target":"graph","created_at":"2026-05-18T00:50:48Z","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":"We analyze the spiral structure that results in a numerical simulation of a galactic disk with stellar and gaseous components evolving in a potential that includes an axisymmetric halo and bulge. We perform a second simulation without the gas component to observe how it affects the spiral structure in the disk. To quantify this, we use a Fourier analysis and obtain values for the pitch angle and the velocity of the self-excited spiral pattern of the disk. The results show a tighter spiral in the simulation with gaseous component. The spiral structure is consistent with a superposition of waves","authors_text":"Dolores Mata-Ch\\'avez, Gilberto C. G\\'omez, Iv\\^anio Puerari","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-08-15T22:42:02Z","title":"Analysis of the spiral structure in a simulated galaxy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1408.3670","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":"sha256:70bce51cf7fdad27bb105b95b214af6aa7b166942d16ffcb91de3f8e2bffeeeb","target":"record","created_at":"2026-05-18T00:50:48Z","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":"99d1f0105046ad1480e2e009669d3ec66c45900e80de3d53f6da209da9c84c81","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-08-15T22:42:02Z","title_canon_sha256":"18611ec8c69598076ec216ce6a61658c0e507c0aa0570f956568cec4885d2ae8"},"schema_version":"1.0","source":{"id":"1408.3670","kind":"arxiv","version":1}},"canonical_sha256":"234ca12aa4a61fa3795b34479675528117b866aa7d7232eeb86ea67aa87c583b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"234ca12aa4a61fa3795b34479675528117b866aa7d7232eeb86ea67aa87c583b","first_computed_at":"2026-05-18T00:50:48.255219Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:50:48.255219Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"IOpE2CX4fFsIMCR8lqAtfEIR86/B9JydCGyJNlCa80eG2bHtBdA+ac89keVZ9PUdprLZDk4121RJ27VMZPa8Cw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:50:48.255872Z","signed_message":"canonical_sha256_bytes"},"source_id":"1408.3670","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:70bce51cf7fdad27bb105b95b214af6aa7b166942d16ffcb91de3f8e2bffeeeb","sha256:dfd8e45d53e38fc256f20d6ebdfcacf162dfc92c6560ec4f5d06b44703ad0154"],"state_sha256":"ebd3ed97fc6d79e202517cde725c05b789444c40a8b03fa843c87ba3af4ae9d6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XXAXGR6R+8mxt1rMKWeTvy12hCU90vWcwaAYjBHlx9SEo3+cPLT5DMaK/NYJfcoIYryl4k0XAeyuoZQHqp1tCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-29T18:48:53.370193Z","bundle_sha256":"b350fd29371fd7f753a7a6c16c2c67e53d4d6cebbfc8a377998d261b0acfdb57"}}