{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:PTHGLMUMUZ6Z2Z2HG6W2TGC77P","short_pith_number":"pith:PTHGLMUM","canonical_record":{"source":{"id":"2502.08971","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-02-13T05:19:43Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"2453bb99d4f2c74053fe602db693c64ff829b686bc6ce2c5394c53b2ae8d52af","abstract_canon_sha256":"4314876e3d523fb3bb44f5f8f50497abef1d5d7a036e3c4738aba2015968e100"},"schema_version":"1.0"},"canonical_sha256":"7cce65b28ca67d9d674737ada9985ffbe1197fcfcd9e712355c9e03f63c4b43b","source":{"kind":"arxiv","id":"2502.08971","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2502.08971","created_at":"2026-07-05T10:55:30Z"},{"alias_kind":"arxiv_version","alias_value":"2502.08971v2","created_at":"2026-07-05T10:55:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2502.08971","created_at":"2026-07-05T10:55:30Z"},{"alias_kind":"pith_short_12","alias_value":"PTHGLMUMUZ6Z","created_at":"2026-07-05T10:55:30Z"},{"alias_kind":"pith_short_16","alias_value":"PTHGLMUMUZ6Z2Z2H","created_at":"2026-07-05T10:55:30Z"},{"alias_kind":"pith_short_8","alias_value":"PTHGLMUM","created_at":"2026-07-05T10:55:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:PTHGLMUMUZ6Z2Z2HG6W2TGC77P","target":"record","payload":{"canonical_record":{"source":{"id":"2502.08971","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-02-13T05:19:43Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"2453bb99d4f2c74053fe602db693c64ff829b686bc6ce2c5394c53b2ae8d52af","abstract_canon_sha256":"4314876e3d523fb3bb44f5f8f50497abef1d5d7a036e3c4738aba2015968e100"},"schema_version":"1.0"},"canonical_sha256":"7cce65b28ca67d9d674737ada9985ffbe1197fcfcd9e712355c9e03f63c4b43b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:55:30.658616Z","signature_b64":"Lk+V5/188pIiF+7jKDamqkwuItppVaat0h6HwNlNEIAgLnts2K1pl5YRo/7bXg8r0CEbCvpf4tyaaXJ6Q25rDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7cce65b28ca67d9d674737ada9985ffbe1197fcfcd9e712355c9e03f63c4b43b","last_reissued_at":"2026-07-05T10:55:30.658088Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:55:30.658088Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2502.08971","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":"2026-07-05T10:55:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IeV2++rjt++vUN/B4WDQQ1yFrOEVjyPyAHEPQj48jsIwp4YrbzoanKJzRsonIybq7ZU1wU/2h7rRgaz0HtogAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T08:48:20.792423Z"},"content_sha256":"9efc308236c70b449f1293c32421a74ad8fc5e3fbc8706306dcad8b916a611a8","schema_version":"1.0","event_id":"sha256:9efc308236c70b449f1293c32421a74ad8fc5e3fbc8706306dcad8b916a611a8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:PTHGLMUMUZ6Z2Z2HG6W2TGC77P","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Semi-analytic modelling of Pop. III star formation and metallicity evolution -- II. Impact on 21cm power spectrum","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.CO","authors_text":"Emanuele M. Ventura, J. Stuart B. Wyithe, Sreedhar Balu, YuXiang Qin","submitted_at":"2025-02-13T05:19:43Z","abstract_excerpt":"Simulating Population (Pop.) III star formation in mini-halos in a large cosmological simulation is an extremely challenging task but it is crucial to estimate its impact on the 21cm power spectrum. In this work, we develop a framework within the semi-analytical code meraxes to estimate the radiative backgrounds from Pop. III stars needed for the computation of the 21cm signal. We computed the 21cm global signal and power spectrum for different Pop. III models varying star formation efficiency, initial mass function (IMF) and specific X-ray luminosity per unit of star formation (LX/SFR). In al"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.08971","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/2502.08971/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":"2026-07-05T10:55:30Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"W3umjZH9R1g/aZ7G2YEir4C+JG6uxwRE2+DdAPaKOKfZQfBnm0BfduPPFzan4DcqO8zvqeoVKTDNBXCQWrPgDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T08:48:20.792971Z"},"content_sha256":"5cae535ee201c9eeb2417b5dc3e7763cc68db19cbbac7ceee6b3193c133ea501","schema_version":"1.0","event_id":"sha256:5cae535ee201c9eeb2417b5dc3e7763cc68db19cbbac7ceee6b3193c133ea501"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PTHGLMUMUZ6Z2Z2HG6W2TGC77P/bundle.json","state_url":"https://pith.science/pith/PTHGLMUMUZ6Z2Z2HG6W2TGC77P/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PTHGLMUMUZ6Z2Z2HG6W2TGC77P/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":"2026-08-08T08:48:20Z","links":{"resolver":"https://pith.science/pith/PTHGLMUMUZ6Z2Z2HG6W2TGC77P","bundle":"https://pith.science/pith/PTHGLMUMUZ6Z2Z2HG6W2TGC77P/bundle.json","state":"https://pith.science/pith/PTHGLMUMUZ6Z2Z2HG6W2TGC77P/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PTHGLMUMUZ6Z2Z2HG6W2TGC77P/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:PTHGLMUMUZ6Z2Z2HG6W2TGC77P","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":"4314876e3d523fb3bb44f5f8f50497abef1d5d7a036e3c4738aba2015968e100","cross_cats_sorted":["astro-ph.GA"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-02-13T05:19:43Z","title_canon_sha256":"2453bb99d4f2c74053fe602db693c64ff829b686bc6ce2c5394c53b2ae8d52af"},"schema_version":"1.0","source":{"id":"2502.08971","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2502.08971","created_at":"2026-07-05T10:55:30Z"},{"alias_kind":"arxiv_version","alias_value":"2502.08971v2","created_at":"2026-07-05T10:55:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2502.08971","created_at":"2026-07-05T10:55:30Z"},{"alias_kind":"pith_short_12","alias_value":"PTHGLMUMUZ6Z","created_at":"2026-07-05T10:55:30Z"},{"alias_kind":"pith_short_16","alias_value":"PTHGLMUMUZ6Z2Z2H","created_at":"2026-07-05T10:55:30Z"},{"alias_kind":"pith_short_8","alias_value":"PTHGLMUM","created_at":"2026-07-05T10:55:30Z"}],"graph_snapshots":[{"event_id":"sha256:5cae535ee201c9eeb2417b5dc3e7763cc68db19cbbac7ceee6b3193c133ea501","target":"graph","created_at":"2026-07-05T10:55:30Z","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/2502.08971/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Simulating Population (Pop.) III star formation in mini-halos in a large cosmological simulation is an extremely challenging task but it is crucial to estimate its impact on the 21cm power spectrum. In this work, we develop a framework within the semi-analytical code meraxes to estimate the radiative backgrounds from Pop. III stars needed for the computation of the 21cm signal. We computed the 21cm global signal and power spectrum for different Pop. III models varying star formation efficiency, initial mass function (IMF) and specific X-ray luminosity per unit of star formation (LX/SFR). In al","authors_text":"Emanuele M. Ventura, J. Stuart B. Wyithe, Sreedhar Balu, YuXiang Qin","cross_cats":["astro-ph.GA"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-02-13T05:19:43Z","title":"Semi-analytic modelling of Pop. III star formation and metallicity evolution -- II. Impact on 21cm power spectrum"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.08971","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":"sha256:9efc308236c70b449f1293c32421a74ad8fc5e3fbc8706306dcad8b916a611a8","target":"record","created_at":"2026-07-05T10:55:30Z","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":"4314876e3d523fb3bb44f5f8f50497abef1d5d7a036e3c4738aba2015968e100","cross_cats_sorted":["astro-ph.GA"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2025-02-13T05:19:43Z","title_canon_sha256":"2453bb99d4f2c74053fe602db693c64ff829b686bc6ce2c5394c53b2ae8d52af"},"schema_version":"1.0","source":{"id":"2502.08971","kind":"arxiv","version":2}},"canonical_sha256":"7cce65b28ca67d9d674737ada9985ffbe1197fcfcd9e712355c9e03f63c4b43b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7cce65b28ca67d9d674737ada9985ffbe1197fcfcd9e712355c9e03f63c4b43b","first_computed_at":"2026-07-05T10:55:30.658088Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:55:30.658088Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Lk+V5/188pIiF+7jKDamqkwuItppVaat0h6HwNlNEIAgLnts2K1pl5YRo/7bXg8r0CEbCvpf4tyaaXJ6Q25rDQ==","signature_status":"signed_v1","signed_at":"2026-07-05T10:55:30.658616Z","signed_message":"canonical_sha256_bytes"},"source_id":"2502.08971","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9efc308236c70b449f1293c32421a74ad8fc5e3fbc8706306dcad8b916a611a8","sha256:5cae535ee201c9eeb2417b5dc3e7763cc68db19cbbac7ceee6b3193c133ea501"],"state_sha256":"2bf57ff5ecb649e289948e167c3a07ba23b9f80431fb3505891a545035d0e0df"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LLsCduv4FhpatJZEOyj//ZcZT6yThz4+Bsgzl5hqdjzgontDABcFOvY6R9Fq3NmDzceZ2OIvMRHVw8/6Ce1nAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-08T08:48:20.798530Z","bundle_sha256":"21a74c65955dc0e9f4d9420921610d3e6d087dcbba19269b61557805f5b6f0c9"}}