{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:XJP5KX32JRLN76AAWJ3I4MOXTN","short_pith_number":"pith:XJP5KX32","canonical_record":{"source":{"id":"0911.0791","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-11-04T11:47:03Z","cross_cats_sorted":["astro-ph.CO","astro-ph.SR"],"title_canon_sha256":"a1bdf3df9ad73d3d8134bfce7b7422fee6c5a45484c0ac521db41f8ae2dbeb01","abstract_canon_sha256":"1a0eb546369702e24941deab960fe86a0f154faccf202e3be3f9b1631355a37d"},"schema_version":"1.0"},"canonical_sha256":"ba5fd55f7a4c56dff800b2768e31d79b62a36dcf7a320ecf84ab6d4c9e99dd0c","source":{"kind":"arxiv","id":"0911.0791","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0911.0791","created_at":"2026-07-04T16:21:45Z"},{"alias_kind":"arxiv_version","alias_value":"0911.0791v1","created_at":"2026-07-04T16:21:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0911.0791","created_at":"2026-07-04T16:21:45Z"},{"alias_kind":"pith_short_12","alias_value":"XJP5KX32JRLN","created_at":"2026-07-04T16:21:45Z"},{"alias_kind":"pith_short_16","alias_value":"XJP5KX32JRLN76AA","created_at":"2026-07-04T16:21:45Z"},{"alias_kind":"pith_short_8","alias_value":"XJP5KX32","created_at":"2026-07-04T16:21:45Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:XJP5KX32JRLN76AAWJ3I4MOXTN","target":"record","payload":{"canonical_record":{"source":{"id":"0911.0791","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-11-04T11:47:03Z","cross_cats_sorted":["astro-ph.CO","astro-ph.SR"],"title_canon_sha256":"a1bdf3df9ad73d3d8134bfce7b7422fee6c5a45484c0ac521db41f8ae2dbeb01","abstract_canon_sha256":"1a0eb546369702e24941deab960fe86a0f154faccf202e3be3f9b1631355a37d"},"schema_version":"1.0"},"canonical_sha256":"ba5fd55f7a4c56dff800b2768e31d79b62a36dcf7a320ecf84ab6d4c9e99dd0c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:21:45.136747Z","signature_b64":"PIT7q8Dv7lMpjPa2Xe9vT2UTVLw4bcYvOGEou7FTGXUrFvxR5KYH9rqg/OVQgTfd7w0fAtCGC81TsH9HCugFBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ba5fd55f7a4c56dff800b2768e31d79b62a36dcf7a320ecf84ab6d4c9e99dd0c","last_reissued_at":"2026-07-04T16:21:45.136389Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:21:45.136389Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0911.0791","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":"2026-07-04T16:21:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AIsQArf2Wn3oU4hxb50MfQKnIn8jUdsXD6z5KwYwhIEXrCzwGRhJUv5Y7F+4b9b89ouPL4KPfdfxJxg7mSz8CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-19T21:59:15.103668Z"},"content_sha256":"c85f7f3992ec85548755d41b2ba29521ab37beff8c20d7f34e19eac242cec658","schema_version":"1.0","event_id":"sha256:c85f7f3992ec85548755d41b2ba29521ab37beff8c20d7f34e19eac242cec658"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:XJP5KX32JRLN76AAWJ3I4MOXTN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Star clusters as simple stellar populations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"A. Gustavo Bruzual (Centro de Investigaciones de Astronomia - CIDA, Venezuela)","submitted_at":"2009-11-04T11:47:03Z","abstract_excerpt":"In this paper, I review to what extent we can understand the photometric properties of star clusters, and of low-mass, unresolved galaxies, in terms of population synthesis models designed to describe `simple stellar populations' (SSPs), i.e., groups of stars born at the same time, in the same volume of space, and from a gas cloud of homogeneous chemical composition. The photometric properties predicted by these models do not readily match the observations of most star clusters, unless we properly take into account the expected variation in the number of stars occupying sparsely populated evol"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0911.0791","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/0911.0791/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":"2026-07-04T16:21:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JDzLABZROsig1tl6revapt8syTDF679smCDpoNRFiqhQ5+Vw7Gm3edT6RynCNKg8uGFOTE6pJ5lIt0M3zMbvBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-19T21:59:15.104178Z"},"content_sha256":"e0d1b31af016d66b297cdbbe84e110525f31850d85d0991345d40015a6710f64","schema_version":"1.0","event_id":"sha256:e0d1b31af016d66b297cdbbe84e110525f31850d85d0991345d40015a6710f64"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XJP5KX32JRLN76AAWJ3I4MOXTN/bundle.json","state_url":"https://pith.science/pith/XJP5KX32JRLN76AAWJ3I4MOXTN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XJP5KX32JRLN76AAWJ3I4MOXTN/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":"2026-08-19T21:59:15Z","links":{"resolver":"https://pith.science/pith/XJP5KX32JRLN76AAWJ3I4MOXTN","bundle":"https://pith.science/pith/XJP5KX32JRLN76AAWJ3I4MOXTN/bundle.json","state":"https://pith.science/pith/XJP5KX32JRLN76AAWJ3I4MOXTN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XJP5KX32JRLN76AAWJ3I4MOXTN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:XJP5KX32JRLN76AAWJ3I4MOXTN","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":"1a0eb546369702e24941deab960fe86a0f154faccf202e3be3f9b1631355a37d","cross_cats_sorted":["astro-ph.CO","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-11-04T11:47:03Z","title_canon_sha256":"a1bdf3df9ad73d3d8134bfce7b7422fee6c5a45484c0ac521db41f8ae2dbeb01"},"schema_version":"1.0","source":{"id":"0911.0791","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0911.0791","created_at":"2026-07-04T16:21:45Z"},{"alias_kind":"arxiv_version","alias_value":"0911.0791v1","created_at":"2026-07-04T16:21:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0911.0791","created_at":"2026-07-04T16:21:45Z"},{"alias_kind":"pith_short_12","alias_value":"XJP5KX32JRLN","created_at":"2026-07-04T16:21:45Z"},{"alias_kind":"pith_short_16","alias_value":"XJP5KX32JRLN76AA","created_at":"2026-07-04T16:21:45Z"},{"alias_kind":"pith_short_8","alias_value":"XJP5KX32","created_at":"2026-07-04T16:21:45Z"}],"graph_snapshots":[{"event_id":"sha256:e0d1b31af016d66b297cdbbe84e110525f31850d85d0991345d40015a6710f64","target":"graph","created_at":"2026-07-04T16:21:45Z","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/0911.0791/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In this paper, I review to what extent we can understand the photometric properties of star clusters, and of low-mass, unresolved galaxies, in terms of population synthesis models designed to describe `simple stellar populations' (SSPs), i.e., groups of stars born at the same time, in the same volume of space, and from a gas cloud of homogeneous chemical composition. The photometric properties predicted by these models do not readily match the observations of most star clusters, unless we properly take into account the expected variation in the number of stars occupying sparsely populated evol","authors_text":"A. Gustavo Bruzual (Centro de Investigaciones de Astronomia - CIDA, Venezuela)","cross_cats":["astro-ph.CO","astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-11-04T11:47:03Z","title":"Star clusters as simple stellar populations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0911.0791","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:c85f7f3992ec85548755d41b2ba29521ab37beff8c20d7f34e19eac242cec658","target":"record","created_at":"2026-07-04T16:21:45Z","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":"1a0eb546369702e24941deab960fe86a0f154faccf202e3be3f9b1631355a37d","cross_cats_sorted":["astro-ph.CO","astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-11-04T11:47:03Z","title_canon_sha256":"a1bdf3df9ad73d3d8134bfce7b7422fee6c5a45484c0ac521db41f8ae2dbeb01"},"schema_version":"1.0","source":{"id":"0911.0791","kind":"arxiv","version":1}},"canonical_sha256":"ba5fd55f7a4c56dff800b2768e31d79b62a36dcf7a320ecf84ab6d4c9e99dd0c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ba5fd55f7a4c56dff800b2768e31d79b62a36dcf7a320ecf84ab6d4c9e99dd0c","first_computed_at":"2026-07-04T16:21:45.136389Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:21:45.136389Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"PIT7q8Dv7lMpjPa2Xe9vT2UTVLw4bcYvOGEou7FTGXUrFvxR5KYH9rqg/OVQgTfd7w0fAtCGC81TsH9HCugFBA==","signature_status":"signed_v1","signed_at":"2026-07-04T16:21:45.136747Z","signed_message":"canonical_sha256_bytes"},"source_id":"0911.0791","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c85f7f3992ec85548755d41b2ba29521ab37beff8c20d7f34e19eac242cec658","sha256:e0d1b31af016d66b297cdbbe84e110525f31850d85d0991345d40015a6710f64"],"state_sha256":"5465efd29011620175c7e848e67039658d609b3a3bd9ba839f98dad63ba1165f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Paj0TUONA/VtPa0PoWDrIhO/MgdmqniR3NoLDC9wnCr5YC7n0KAEpWupaUIGCXxo0K/2a7WLnr0CGizoR3mPAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-19T21:59:15.108669Z","bundle_sha256":"b11eabcb48f74f2739f88a41b11a36884b072b5083a4cfa5fe070b10d0f21566"}}