{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:XCJAA6KFP4X7Z7E5TVXPQKNI6J","short_pith_number":"pith:XCJAA6KF","canonical_record":{"source":{"id":"0807.2242","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-07-14T20:01:51Z","cross_cats_sorted":[],"title_canon_sha256":"85d354f5e9a52af3cab57533a381ccf743005387fac13749b0320dbe12400d54","abstract_canon_sha256":"b126529a56530b201d3ceb1beb4cd63f2ae47c97ee9ee875a85fd3a892badf55"},"schema_version":"1.0"},"canonical_sha256":"b8920079457f2ffcfc9d9d6ef829a8f25b6570808416f167247b676e8e310a5b","source":{"kind":"arxiv","id":"0807.2242","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0807.2242","created_at":"2026-05-18T04:29:33Z"},{"alias_kind":"arxiv_version","alias_value":"0807.2242v2","created_at":"2026-05-18T04:29:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0807.2242","created_at":"2026-05-18T04:29:33Z"},{"alias_kind":"pith_short_12","alias_value":"XCJAA6KFP4X7","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"XCJAA6KFP4X7Z7E5","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"XCJAA6KF","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:XCJAA6KFP4X7Z7E5TVXPQKNI6J","target":"record","payload":{"canonical_record":{"source":{"id":"0807.2242","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-07-14T20:01:51Z","cross_cats_sorted":[],"title_canon_sha256":"85d354f5e9a52af3cab57533a381ccf743005387fac13749b0320dbe12400d54","abstract_canon_sha256":"b126529a56530b201d3ceb1beb4cd63f2ae47c97ee9ee875a85fd3a892badf55"},"schema_version":"1.0"},"canonical_sha256":"b8920079457f2ffcfc9d9d6ef829a8f25b6570808416f167247b676e8e310a5b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:29:33.243820Z","signature_b64":"3sakr3EZxuC+i4WMkI16j1WktHlt3QB2ZcNm/E0S7A4aRHgKNDz61v6EY57aXdunsNa/Wb3izUT1Cx4nwYQxCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b8920079457f2ffcfc9d9d6ef829a8f25b6570808416f167247b676e8e310a5b","last_reissued_at":"2026-05-18T04:29:33.243339Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:29:33.243339Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0807.2242","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":"2026-05-18T04:29:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mOLBIHtx5vl4VbDgasa87cmAdYEPdUbD8pSfxzMmrQ2AybsoAD8v072xAdx7bp19y3m3+kX38n/2L7eOkuRtDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T02:18:53.496174Z"},"content_sha256":"a57d71f3f21b5f486dbbc4de2b1978f79cc9d444614c47fb77ee568c603e0a75","schema_version":"1.0","event_id":"sha256:a57d71f3f21b5f486dbbc4de2b1978f79cc9d444614c47fb77ee568c603e0a75"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:XCJAA6KFP4X7Z7E5TVXPQKNI6J","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Bayesian analysis of sparse anisotropic universe models and application to the 5-yr WMAP data","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Hans Kristian Eriksen, Nicolaas E. Groeneboom","submitted_at":"2008-07-14T20:01:51Z","abstract_excerpt":"We extend the previously described CMB Gibbs sampling framework to allow for exact Bayesian analysis of anisotropic universe models, and apply this method to the 5-year WMAP temperature observations. This involves adding support for non-diagonal signal covariance matrices, and implementing a general spectral parameter MCMC sampler. As a worked example we apply these techniques to the model recently introduced by Ackerman et al., describing for instance violations of rotational invariance during the inflationary epoch. After verifying the code with simulated data, we analyze the foreground-redu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0807.2242","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":"2026-05-18T04:29:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ABACPRnp1dQB28u51pp0OMXjIqCnZaV4J7zss4OL4cziJEF/sPBhIKp0Q4RB1rGhr60LboJ7lFQn8++sODZ2CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T02:18:53.496525Z"},"content_sha256":"4db5eac864146cb0e4ba0f02cba47aa8d05d6726cde343f9591f4c9336482cc1","schema_version":"1.0","event_id":"sha256:4db5eac864146cb0e4ba0f02cba47aa8d05d6726cde343f9591f4c9336482cc1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XCJAA6KFP4X7Z7E5TVXPQKNI6J/bundle.json","state_url":"https://pith.science/pith/XCJAA6KFP4X7Z7E5TVXPQKNI6J/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XCJAA6KFP4X7Z7E5TVXPQKNI6J/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":"2026-06-02T02:18:53Z","links":{"resolver":"https://pith.science/pith/XCJAA6KFP4X7Z7E5TVXPQKNI6J","bundle":"https://pith.science/pith/XCJAA6KFP4X7Z7E5TVXPQKNI6J/bundle.json","state":"https://pith.science/pith/XCJAA6KFP4X7Z7E5TVXPQKNI6J/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XCJAA6KFP4X7Z7E5TVXPQKNI6J/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:XCJAA6KFP4X7Z7E5TVXPQKNI6J","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":"b126529a56530b201d3ceb1beb4cd63f2ae47c97ee9ee875a85fd3a892badf55","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-07-14T20:01:51Z","title_canon_sha256":"85d354f5e9a52af3cab57533a381ccf743005387fac13749b0320dbe12400d54"},"schema_version":"1.0","source":{"id":"0807.2242","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0807.2242","created_at":"2026-05-18T04:29:33Z"},{"alias_kind":"arxiv_version","alias_value":"0807.2242v2","created_at":"2026-05-18T04:29:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0807.2242","created_at":"2026-05-18T04:29:33Z"},{"alias_kind":"pith_short_12","alias_value":"XCJAA6KFP4X7","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"XCJAA6KFP4X7Z7E5","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"XCJAA6KF","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:4db5eac864146cb0e4ba0f02cba47aa8d05d6726cde343f9591f4c9336482cc1","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 extend the previously described CMB Gibbs sampling framework to allow for exact Bayesian analysis of anisotropic universe models, and apply this method to the 5-year WMAP temperature observations. This involves adding support for non-diagonal signal covariance matrices, and implementing a general spectral parameter MCMC sampler. As a worked example we apply these techniques to the model recently introduced by Ackerman et al., describing for instance violations of rotational invariance during the inflationary epoch. After verifying the code with simulated data, we analyze the foreground-redu","authors_text":"Hans Kristian Eriksen, Nicolaas E. Groeneboom","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-07-14T20:01:51Z","title":"Bayesian analysis of sparse anisotropic universe models and application to the 5-yr WMAP data"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0807.2242","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:a57d71f3f21b5f486dbbc4de2b1978f79cc9d444614c47fb77ee568c603e0a75","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":"b126529a56530b201d3ceb1beb4cd63f2ae47c97ee9ee875a85fd3a892badf55","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph","submitted_at":"2008-07-14T20:01:51Z","title_canon_sha256":"85d354f5e9a52af3cab57533a381ccf743005387fac13749b0320dbe12400d54"},"schema_version":"1.0","source":{"id":"0807.2242","kind":"arxiv","version":2}},"canonical_sha256":"b8920079457f2ffcfc9d9d6ef829a8f25b6570808416f167247b676e8e310a5b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b8920079457f2ffcfc9d9d6ef829a8f25b6570808416f167247b676e8e310a5b","first_computed_at":"2026-05-18T04:29:33.243339Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:29:33.243339Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3sakr3EZxuC+i4WMkI16j1WktHlt3QB2ZcNm/E0S7A4aRHgKNDz61v6EY57aXdunsNa/Wb3izUT1Cx4nwYQxCA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:29:33.243820Z","signed_message":"canonical_sha256_bytes"},"source_id":"0807.2242","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a57d71f3f21b5f486dbbc4de2b1978f79cc9d444614c47fb77ee568c603e0a75","sha256:4db5eac864146cb0e4ba0f02cba47aa8d05d6726cde343f9591f4c9336482cc1"],"state_sha256":"df0e47d3e0b9c3fb7cc3a0794fee04bc084837fe4cfa32f9f737240f136e477a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YybMFn4Qx+o4S1/Jq19z6IIFG0gvJZW+EJNZ8Wi6OMEwh6qHxv7Lb60KpCeOo9ovcZ7VoQjq6zPaZW64B/4KAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T02:18:53.498367Z","bundle_sha256":"b42854dab21cd68103b1976f80abf94e9ba7ff055166ad8ff31471ca6a87c23c"}}