{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:V5VIGJRPMCN4LGXY6HF4ANOXWX","short_pith_number":"pith:V5VIGJRP","canonical_record":{"source":{"id":"0807.0624","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-07-03T19:40:36Z","cross_cats_sorted":["physics.data-an"],"title_canon_sha256":"62c4ad19d2ec42072a367dc6ff25b5ecb21a8c6f275d3943870278574967df0b","abstract_canon_sha256":"e24a7fbdfd4db1368dd3ebbf5a0fc75391b585304c6e4ff468df0b5edaad84fa"},"schema_version":"1.0"},"canonical_sha256":"af6a83262f609bc59af8f1cbc035d7b5c2319f3deddea06a29991768703325bb","source":{"kind":"arxiv","id":"0807.0624","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0807.0624","created_at":"2026-05-18T04:29:33Z"},{"alias_kind":"arxiv_version","alias_value":"0807.0624v1","created_at":"2026-05-18T04:29:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0807.0624","created_at":"2026-05-18T04:29:33Z"},{"alias_kind":"pith_short_12","alias_value":"V5VIGJRPMCN4","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"V5VIGJRPMCN4LGXY","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"V5VIGJRP","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:V5VIGJRPMCN4LGXY6HF4ANOXWX","target":"record","payload":{"canonical_record":{"source":{"id":"0807.0624","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-07-03T19:40:36Z","cross_cats_sorted":["physics.data-an"],"title_canon_sha256":"62c4ad19d2ec42072a367dc6ff25b5ecb21a8c6f275d3943870278574967df0b","abstract_canon_sha256":"e24a7fbdfd4db1368dd3ebbf5a0fc75391b585304c6e4ff468df0b5edaad84fa"},"schema_version":"1.0"},"canonical_sha256":"af6a83262f609bc59af8f1cbc035d7b5c2319f3deddea06a29991768703325bb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:29:33.323981Z","signature_b64":"gz9pMCi+Ul5XNaAEjAjJVdH8gxVqONKG9e7eTYJLxBVrXv3gyrToDtw5tJZJjAaSeIkcxzl8E0xjKPRIj2AzBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"af6a83262f609bc59af8f1cbc035d7b5c2319f3deddea06a29991768703325bb","last_reissued_at":"2026-05-18T04:29:33.323580Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:29:33.323580Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0807.0624","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":"2026-05-18T04:29:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"B4NC2bO69HOmywN2bpzKeHqYhMg55keTSiruOJVVNzs04j+lVrE/Yosaq/CS4AM3J7v7OQTamYOTQVbEnbfgCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T05:51:56.832761Z"},"content_sha256":"48728456a70266d1ac7104e6399f1250574828403f8ad4ba15049071cf3e5f34","schema_version":"1.0","event_id":"sha256:48728456a70266d1ac7104e6399f1250574828403f8ad4ba15049071cf3e5f34"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:V5VIGJRPMCN4LGXY6HF4ANOXWX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Markov Chain Monte Carlo Algorithm for analysis of low signal-to-noise CMB data","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.data-an"],"primary_cat":"astro-ph","authors_text":"B.D. Wandelt, G. Huey, H.K. Eriksen, I.J. O'Dwyer, J.B. Jewell, K.M. Gorski","submitted_at":"2008-07-03T19:40:36Z","abstract_excerpt":"We present a new Monte Carlo Markov Chain algorithm for CMB analysis in the low signal-to-noise regime. This method builds on and complements the previously described CMB Gibbs sampler, and effectively solves the low signal-to-noise inefficiency problem of the direct Gibbs sampler. The new algorithm is a simple Metropolis-Hastings sampler with a general proposal rule for the power spectrum, C_l, followed by a particular deterministic rescaling operation of the sky signal. The acceptance probability for this joint move depends on the sky map only through the difference of chi-squared between th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0807.0624","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":"2026-05-18T04:29:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3P118fmLZ911lzYo0MQP7dv1VQaqSlKFTGesUbPnWmjZAoEJnsUhnLrwyg/LC6SfY3PcUtUOLjmGylEEYRmGBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T05:51:56.833103Z"},"content_sha256":"12c6ab2bcc116205be5f07d3199c74e48c5a8c9934ebff10c2031b4cecdf79ee","schema_version":"1.0","event_id":"sha256:12c6ab2bcc116205be5f07d3199c74e48c5a8c9934ebff10c2031b4cecdf79ee"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/V5VIGJRPMCN4LGXY6HF4ANOXWX/bundle.json","state_url":"https://pith.science/pith/V5VIGJRPMCN4LGXY6HF4ANOXWX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/V5VIGJRPMCN4LGXY6HF4ANOXWX/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":"2026-06-05T05:51:56Z","links":{"resolver":"https://pith.science/pith/V5VIGJRPMCN4LGXY6HF4ANOXWX","bundle":"https://pith.science/pith/V5VIGJRPMCN4LGXY6HF4ANOXWX/bundle.json","state":"https://pith.science/pith/V5VIGJRPMCN4LGXY6HF4ANOXWX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/V5VIGJRPMCN4LGXY6HF4ANOXWX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:V5VIGJRPMCN4LGXY6HF4ANOXWX","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":"e24a7fbdfd4db1368dd3ebbf5a0fc75391b585304c6e4ff468df0b5edaad84fa","cross_cats_sorted":["physics.data-an"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-07-03T19:40:36Z","title_canon_sha256":"62c4ad19d2ec42072a367dc6ff25b5ecb21a8c6f275d3943870278574967df0b"},"schema_version":"1.0","source":{"id":"0807.0624","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0807.0624","created_at":"2026-05-18T04:29:33Z"},{"alias_kind":"arxiv_version","alias_value":"0807.0624v1","created_at":"2026-05-18T04:29:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0807.0624","created_at":"2026-05-18T04:29:33Z"},{"alias_kind":"pith_short_12","alias_value":"V5VIGJRPMCN4","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"V5VIGJRPMCN4LGXY","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"V5VIGJRP","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:12c6ab2bcc116205be5f07d3199c74e48c5a8c9934ebff10c2031b4cecdf79ee","target":"graph","created_at":"2026-05-18T04:29:33Z","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 present a new Monte Carlo Markov Chain algorithm for CMB analysis in the low signal-to-noise regime. This method builds on and complements the previously described CMB Gibbs sampler, and effectively solves the low signal-to-noise inefficiency problem of the direct Gibbs sampler. The new algorithm is a simple Metropolis-Hastings sampler with a general proposal rule for the power spectrum, C_l, followed by a particular deterministic rescaling operation of the sky signal. The acceptance probability for this joint move depends on the sky map only through the difference of chi-squared between th","authors_text":"B.D. Wandelt, G. Huey, H.K. Eriksen, I.J. O'Dwyer, J.B. Jewell, K.M. Gorski","cross_cats":["physics.data-an"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-07-03T19:40:36Z","title":"A Markov Chain Monte Carlo Algorithm for analysis of low signal-to-noise CMB data"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0807.0624","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":"sha256:48728456a70266d1ac7104e6399f1250574828403f8ad4ba15049071cf3e5f34","target":"record","created_at":"2026-05-18T04:29:33Z","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":"e24a7fbdfd4db1368dd3ebbf5a0fc75391b585304c6e4ff468df0b5edaad84fa","cross_cats_sorted":["physics.data-an"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-07-03T19:40:36Z","title_canon_sha256":"62c4ad19d2ec42072a367dc6ff25b5ecb21a8c6f275d3943870278574967df0b"},"schema_version":"1.0","source":{"id":"0807.0624","kind":"arxiv","version":1}},"canonical_sha256":"af6a83262f609bc59af8f1cbc035d7b5c2319f3deddea06a29991768703325bb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"af6a83262f609bc59af8f1cbc035d7b5c2319f3deddea06a29991768703325bb","first_computed_at":"2026-05-18T04:29:33.323580Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:29:33.323580Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gz9pMCi+Ul5XNaAEjAjJVdH8gxVqONKG9e7eTYJLxBVrXv3gyrToDtw5tJZJjAaSeIkcxzl8E0xjKPRIj2AzBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T04:29:33.323981Z","signed_message":"canonical_sha256_bytes"},"source_id":"0807.0624","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:48728456a70266d1ac7104e6399f1250574828403f8ad4ba15049071cf3e5f34","sha256:12c6ab2bcc116205be5f07d3199c74e48c5a8c9934ebff10c2031b4cecdf79ee"],"state_sha256":"d58fbb66f95e0c4c2fe5b2554f6640facbdf408272def7086b222503fbde99a1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JXgIreczZ9gETJXj0TPwmaucqaRkmEu+10KSJwlnvlCO7bS/I+IZc6E5aErlKWP4twWHjNF3F1k+7+6TtUPiBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T05:51:56.835280Z","bundle_sha256":"ddd019a4588c4d18b5991062a327c6fe5d3ac8dc4f7dac6e068750e34ca9f679"}}