{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:B5ON6HNY7CNJFGGTJR6VL7CIC4","short_pith_number":"pith:B5ON6HNY","canonical_record":{"source":{"id":"2508.03809","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-08-05T18:00:23Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"d4133cb3234063e7900032d41ae0e9a366d1bebe4011a4ca8322a0e771ea7ab2","abstract_canon_sha256":"795be260ff2d217b4c4383f855dbae1fbfc9746043bd97d4326716cb6838aacf"},"schema_version":"1.0"},"canonical_sha256":"0f5cdf1db8f89a9298d34c7d55fc48170f1d44aa0455ebc845302acfe1194594","source":{"kind":"arxiv","id":"2508.03809","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2508.03809","created_at":"2026-07-05T11:52:22Z"},{"alias_kind":"arxiv_version","alias_value":"2508.03809v2","created_at":"2026-07-05T11:52:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2508.03809","created_at":"2026-07-05T11:52:22Z"},{"alias_kind":"pith_short_12","alias_value":"B5ON6HNY7CNJ","created_at":"2026-07-05T11:52:22Z"},{"alias_kind":"pith_short_16","alias_value":"B5ON6HNY7CNJFGGT","created_at":"2026-07-05T11:52:22Z"},{"alias_kind":"pith_short_8","alias_value":"B5ON6HNY","created_at":"2026-07-05T11:52:22Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:B5ON6HNY7CNJFGGTJR6VL7CIC4","target":"record","payload":{"canonical_record":{"source":{"id":"2508.03809","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-08-05T18:00:23Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"d4133cb3234063e7900032d41ae0e9a366d1bebe4011a4ca8322a0e771ea7ab2","abstract_canon_sha256":"795be260ff2d217b4c4383f855dbae1fbfc9746043bd97d4326716cb6838aacf"},"schema_version":"1.0"},"canonical_sha256":"0f5cdf1db8f89a9298d34c7d55fc48170f1d44aa0455ebc845302acfe1194594","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:52:22.999197Z","signature_b64":"5YAhDpOqYF18eu1v1NPvR7GYwnZsQS4T1AQOXqyG9QWa2vJgS3tV+WNvoPtNMt4S5PRMLdyJ2M7j6kXcadNSAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0f5cdf1db8f89a9298d34c7d55fc48170f1d44aa0455ebc845302acfe1194594","last_reissued_at":"2026-07-05T11:52:22.998731Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:52:22.998731Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2508.03809","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":"2026-07-05T11:52:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"izyc65G+BBdd1PXwRGuRZNCGCtCufFNEJGrvLezaS/IIuKVJwQMoRDIgIA0flyKfmpfAzFc+Cv+M+EWE/XwuCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T11:25:42.623167Z"},"content_sha256":"1d11d8c0352bb4b6d434247113be4cfa1094c7ecfb33b23b809cb72c1ce66c39","schema_version":"1.0","event_id":"sha256:1d11d8c0352bb4b6d434247113be4cfa1094c7ecfb33b23b809cb72c1ce66c39"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:B5ON6HNY7CNJFGGTJR6VL7CIC4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Analysis and simulations of binary black hole merger spins -- the question of spin-axis tossing at black hole formation","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"Ali Sepas, Casper C. Pedersen, Christophe A.N. Biscio, Claudia Larsen, Hans C.G. Larsen, Thomas M. Tauris","submitted_at":"2025-08-05T18:00:23Z","abstract_excerpt":"The origin of binary black hole (BH) mergers remains a topic of active debate, with effective spins (chi_eff) measured by the LIGO-Virgo-KAGRA (LVK) Collaboration providing crucial insights. In this study, our objective is to investigate the empirical chi_eff distribution (and constrain individual spin components) of binary BH mergers and compare them with extensive simulations, assuming that they originate purely from isolated binaries or a mixture of formation channels. We explore scenarios using BH kicks with and without the effect of spin-axis tossing during BH formation. We employ simple "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2508.03809","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/2508.03809/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":"2026-07-05T11:52:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wqriUSp3GMxqAmIApWU9BHNGG4yr1xt5lJzEyZVc/kWqpbyjvZfb5vZ9UxZZvPxchlEdvkOI/ZhQ6+aKYjj7BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T11:25:42.623663Z"},"content_sha256":"95820ef8c26d153bbb0bde6d9c54f4e12b290e524406d5ad2f2e7b0ef218f164","schema_version":"1.0","event_id":"sha256:95820ef8c26d153bbb0bde6d9c54f4e12b290e524406d5ad2f2e7b0ef218f164"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/B5ON6HNY7CNJFGGTJR6VL7CIC4/bundle.json","state_url":"https://pith.science/pith/B5ON6HNY7CNJFGGTJR6VL7CIC4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/B5ON6HNY7CNJFGGTJR6VL7CIC4/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":"2026-08-08T11:25:42Z","links":{"resolver":"https://pith.science/pith/B5ON6HNY7CNJFGGTJR6VL7CIC4","bundle":"https://pith.science/pith/B5ON6HNY7CNJFGGTJR6VL7CIC4/bundle.json","state":"https://pith.science/pith/B5ON6HNY7CNJFGGTJR6VL7CIC4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/B5ON6HNY7CNJFGGTJR6VL7CIC4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:B5ON6HNY7CNJFGGTJR6VL7CIC4","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":"795be260ff2d217b4c4383f855dbae1fbfc9746043bd97d4326716cb6838aacf","cross_cats_sorted":["astro-ph.SR"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-08-05T18:00:23Z","title_canon_sha256":"d4133cb3234063e7900032d41ae0e9a366d1bebe4011a4ca8322a0e771ea7ab2"},"schema_version":"1.0","source":{"id":"2508.03809","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2508.03809","created_at":"2026-07-05T11:52:22Z"},{"alias_kind":"arxiv_version","alias_value":"2508.03809v2","created_at":"2026-07-05T11:52:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2508.03809","created_at":"2026-07-05T11:52:22Z"},{"alias_kind":"pith_short_12","alias_value":"B5ON6HNY7CNJ","created_at":"2026-07-05T11:52:22Z"},{"alias_kind":"pith_short_16","alias_value":"B5ON6HNY7CNJFGGT","created_at":"2026-07-05T11:52:22Z"},{"alias_kind":"pith_short_8","alias_value":"B5ON6HNY","created_at":"2026-07-05T11:52:22Z"}],"graph_snapshots":[{"event_id":"sha256:95820ef8c26d153bbb0bde6d9c54f4e12b290e524406d5ad2f2e7b0ef218f164","target":"graph","created_at":"2026-07-05T11:52:22Z","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/2508.03809/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The origin of binary black hole (BH) mergers remains a topic of active debate, with effective spins (chi_eff) measured by the LIGO-Virgo-KAGRA (LVK) Collaboration providing crucial insights. In this study, our objective is to investigate the empirical chi_eff distribution (and constrain individual spin components) of binary BH mergers and compare them with extensive simulations, assuming that they originate purely from isolated binaries or a mixture of formation channels. We explore scenarios using BH kicks with and without the effect of spin-axis tossing during BH formation. We employ simple ","authors_text":"Ali Sepas, Casper C. Pedersen, Christophe A.N. Biscio, Claudia Larsen, Hans C.G. Larsen, Thomas M. Tauris","cross_cats":["astro-ph.SR"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-08-05T18:00:23Z","title":"Analysis and simulations of binary black hole merger spins -- the question of spin-axis tossing at black hole formation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2508.03809","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":"sha256:1d11d8c0352bb4b6d434247113be4cfa1094c7ecfb33b23b809cb72c1ce66c39","target":"record","created_at":"2026-07-05T11:52:22Z","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":"795be260ff2d217b4c4383f855dbae1fbfc9746043bd97d4326716cb6838aacf","cross_cats_sorted":["astro-ph.SR"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-08-05T18:00:23Z","title_canon_sha256":"d4133cb3234063e7900032d41ae0e9a366d1bebe4011a4ca8322a0e771ea7ab2"},"schema_version":"1.0","source":{"id":"2508.03809","kind":"arxiv","version":2}},"canonical_sha256":"0f5cdf1db8f89a9298d34c7d55fc48170f1d44aa0455ebc845302acfe1194594","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0f5cdf1db8f89a9298d34c7d55fc48170f1d44aa0455ebc845302acfe1194594","first_computed_at":"2026-07-05T11:52:22.998731Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:52:22.998731Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5YAhDpOqYF18eu1v1NPvR7GYwnZsQS4T1AQOXqyG9QWa2vJgS3tV+WNvoPtNMt4S5PRMLdyJ2M7j6kXcadNSAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T11:52:22.999197Z","signed_message":"canonical_sha256_bytes"},"source_id":"2508.03809","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1d11d8c0352bb4b6d434247113be4cfa1094c7ecfb33b23b809cb72c1ce66c39","sha256:95820ef8c26d153bbb0bde6d9c54f4e12b290e524406d5ad2f2e7b0ef218f164"],"state_sha256":"26fcec2c7097603237219519a09d3716eff2e54ab6b0d66d38fb45ba530a9cfd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OCpY7Ez0fmZDJOfKIrlQPitUfgNb64VobeaWUrUvM4yqEjL01glkFEaDG4Fsdk+SbJY/BxuF3fXIfXGRgUsQDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-08T11:25:42.628573Z","bundle_sha256":"ea690d872dda44dc2790f0b68ca3d903d27522ff35055264dd7edf66b21d77b3"}}