{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:BLNXOFQ6CYM7OUM6IQAEKZV25S","short_pith_number":"pith:BLNXOFQ6","canonical_record":{"source":{"id":"0901.3557","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-01-22T21:59:50Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"01dda450135452ef176db5519df8e2fa77e4a054feab8f69426a819984085984","abstract_canon_sha256":"1851ab2fa9e3849f5987dcbcdf8c76dd7e866c8933f038801dfec007942b0400"},"schema_version":"1.0"},"canonical_sha256":"0adb77161e1619f7519e44004566baec8f82401aa1378ca35b6e1fae3feb25f7","source":{"kind":"arxiv","id":"0901.3557","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0901.3557","created_at":"2026-05-18T02:14:56Z"},{"alias_kind":"arxiv_version","alias_value":"0901.3557v2","created_at":"2026-05-18T02:14:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0901.3557","created_at":"2026-05-18T02:14:56Z"},{"alias_kind":"pith_short_12","alias_value":"BLNXOFQ6CYM7","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"BLNXOFQ6CYM7OUM6","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"BLNXOFQ6","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:BLNXOFQ6CYM7OUM6IQAEKZV25S","target":"record","payload":{"canonical_record":{"source":{"id":"0901.3557","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-01-22T21:59:50Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"01dda450135452ef176db5519df8e2fa77e4a054feab8f69426a819984085984","abstract_canon_sha256":"1851ab2fa9e3849f5987dcbcdf8c76dd7e866c8933f038801dfec007942b0400"},"schema_version":"1.0"},"canonical_sha256":"0adb77161e1619f7519e44004566baec8f82401aa1378ca35b6e1fae3feb25f7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:14:56.205976Z","signature_b64":"e5atxz/HrSLv5zf0OpzbR4r+3ydev+itd08r6jWCgHCopOqxM5eQpl29YWHeUzErT4PyXM/P1284RkvsbtrYBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0adb77161e1619f7519e44004566baec8f82401aa1378ca35b6e1fae3feb25f7","last_reissued_at":"2026-05-18T02:14:56.205488Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:14:56.205488Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0901.3557","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":"2026-05-18T02:14:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nuOJm/MBNuyJtsglFgOl6M/t2/j5xmXts/2vvRqRZwPJji3XGV82qPMS55XNUw7+7QFkjuAexPMX9UBTgOpbCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T09:01:46.571908Z"},"content_sha256":"8fc3c857c3ca0ad54bbe74c0326cb2e8efa7f6685236c0b2ed8274702dad477f","schema_version":"1.0","event_id":"sha256:8fc3c857c3ca0ad54bbe74c0326cb2e8efa7f6685236c0b2ed8274702dad477f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:BLNXOFQ6CYM7OUM6IQAEKZV25S","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Optimal PSF modeling for weak lensing: complexity and sparsity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.IM","authors_text":"A. Amara, A. Refregier, S. Paulin-Henriksson","submitted_at":"2009-01-22T21:59:50Z","abstract_excerpt":"We investigate the impact of point spread function (PSF) fitting errors on cosmic shear measurements using the concepts of complexity and sparsity. Complexity, introduced in a previous paper, characterizes the number of degrees of freedom of the PSF. For instance, fitting an underlying PSF with a model with low complexity will lead to small statistical errors on the model parameters, however these parameters could suffer from large biases. Alternatively, fitting with a large number of parameters will tend to reduce biases at the expense of statistical errors. We perform an optimisation of scat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0901.3557","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":"2026-05-18T02:14:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rk8/a8li0agrc4RSCCRrU+rKww42LmoirK2JgcDfZPirpRb6OuEd0GJGlFWd5BkblKcvXsNhCiEucwTBnYFUCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-11T09:01:46.572254Z"},"content_sha256":"344903d4f49b17ddf9c880508535365530a2ac69dc71bbc5c26017c7585f660e","schema_version":"1.0","event_id":"sha256:344903d4f49b17ddf9c880508535365530a2ac69dc71bbc5c26017c7585f660e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BLNXOFQ6CYM7OUM6IQAEKZV25S/bundle.json","state_url":"https://pith.science/pith/BLNXOFQ6CYM7OUM6IQAEKZV25S/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BLNXOFQ6CYM7OUM6IQAEKZV25S/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":"2026-06-11T09:01:46Z","links":{"resolver":"https://pith.science/pith/BLNXOFQ6CYM7OUM6IQAEKZV25S","bundle":"https://pith.science/pith/BLNXOFQ6CYM7OUM6IQAEKZV25S/bundle.json","state":"https://pith.science/pith/BLNXOFQ6CYM7OUM6IQAEKZV25S/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BLNXOFQ6CYM7OUM6IQAEKZV25S/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:BLNXOFQ6CYM7OUM6IQAEKZV25S","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":"1851ab2fa9e3849f5987dcbcdf8c76dd7e866c8933f038801dfec007942b0400","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-01-22T21:59:50Z","title_canon_sha256":"01dda450135452ef176db5519df8e2fa77e4a054feab8f69426a819984085984"},"schema_version":"1.0","source":{"id":"0901.3557","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0901.3557","created_at":"2026-05-18T02:14:56Z"},{"alias_kind":"arxiv_version","alias_value":"0901.3557v2","created_at":"2026-05-18T02:14:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0901.3557","created_at":"2026-05-18T02:14:56Z"},{"alias_kind":"pith_short_12","alias_value":"BLNXOFQ6CYM7","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"BLNXOFQ6CYM7OUM6","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"BLNXOFQ6","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:344903d4f49b17ddf9c880508535365530a2ac69dc71bbc5c26017c7585f660e","target":"graph","created_at":"2026-05-18T02:14:56Z","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 investigate the impact of point spread function (PSF) fitting errors on cosmic shear measurements using the concepts of complexity and sparsity. Complexity, introduced in a previous paper, characterizes the number of degrees of freedom of the PSF. For instance, fitting an underlying PSF with a model with low complexity will lead to small statistical errors on the model parameters, however these parameters could suffer from large biases. Alternatively, fitting with a large number of parameters will tend to reduce biases at the expense of statistical errors. We perform an optimisation of scat","authors_text":"A. Amara, A. Refregier, S. Paulin-Henriksson","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-01-22T21:59:50Z","title":"Optimal PSF modeling for weak lensing: complexity and sparsity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0901.3557","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":"sha256:8fc3c857c3ca0ad54bbe74c0326cb2e8efa7f6685236c0b2ed8274702dad477f","target":"record","created_at":"2026-05-18T02:14:56Z","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":"1851ab2fa9e3849f5987dcbcdf8c76dd7e866c8933f038801dfec007942b0400","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2009-01-22T21:59:50Z","title_canon_sha256":"01dda450135452ef176db5519df8e2fa77e4a054feab8f69426a819984085984"},"schema_version":"1.0","source":{"id":"0901.3557","kind":"arxiv","version":2}},"canonical_sha256":"0adb77161e1619f7519e44004566baec8f82401aa1378ca35b6e1fae3feb25f7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0adb77161e1619f7519e44004566baec8f82401aa1378ca35b6e1fae3feb25f7","first_computed_at":"2026-05-18T02:14:56.205488Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:14:56.205488Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"e5atxz/HrSLv5zf0OpzbR4r+3ydev+itd08r6jWCgHCopOqxM5eQpl29YWHeUzErT4PyXM/P1284RkvsbtrYBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:14:56.205976Z","signed_message":"canonical_sha256_bytes"},"source_id":"0901.3557","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8fc3c857c3ca0ad54bbe74c0326cb2e8efa7f6685236c0b2ed8274702dad477f","sha256:344903d4f49b17ddf9c880508535365530a2ac69dc71bbc5c26017c7585f660e"],"state_sha256":"44173f0fcac32967a47d908c043d8d98a618bc228e5a2a59ec844362c958e27c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6vGkeL6ZHaDE4I4WxkN1wnJx/nNP3L08ECqtZ7CHXrhQVijsceoarPeXT3daEXazy1+KeLFE+0sQbZ9qeVLxAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-11T09:01:46.574501Z","bundle_sha256":"dfc1ef12c905d1e5dc7b40735f143425bb11af364362a8d7e71546c55ef91358"}}