{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:WYXBT664KXFIB37M6BE36DLLH3","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":"a3ece3131b0abe25610db91318d7d946ebea31409f077da342876e6342da40b2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2014-08-22T21:28:17Z","title_canon_sha256":"40cfeca5999d52191796047ca9f6fc5b26d69f9c118b44f597aa44ea9372d151"},"schema_version":"1.0","source":{"id":"1408.5434","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1408.5434","created_at":"2026-05-18T02:31:59Z"},{"alias_kind":"arxiv_version","alias_value":"1408.5434v2","created_at":"2026-05-18T02:31:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1408.5434","created_at":"2026-05-18T02:31:59Z"},{"alias_kind":"pith_short_12","alias_value":"WYXBT664KXFI","created_at":"2026-05-18T12:28:54Z"},{"alias_kind":"pith_short_16","alias_value":"WYXBT664KXFIB37M","created_at":"2026-05-18T12:28:54Z"},{"alias_kind":"pith_short_8","alias_value":"WYXBT664","created_at":"2026-05-18T12:28:54Z"}],"graph_snapshots":[{"event_id":"sha256:e9179b9f96ad8872389910d64f02d7f5d0519cedcc98228e05da38f2a514503d","target":"graph","created_at":"2026-05-18T02:31:59Z","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":"Photon-photon interactions, as described by the standard Heisenberg-Euler interaction, can transform plane polarization of the CMB into circular polarization, in the period right after last scattering. We estimate the standard deviation of the resulting circular polarization parameter, as constrained by confining observations to angular regions of large plane polarization, and find results of the order of $10^{-9}$ for the Stokes parameter $V$.","authors_text":"R. F. Sawyer","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2014-08-22T21:28:17Z","title":"Photon-photon interactions can be a source of CMB circular polarization"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1408.5434","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":"sha256:863f1be7d31ec8a68dbe6761722dd412ce12640085b6f6cf79e9487d39f008e3","target":"record","created_at":"2026-05-18T02:31:59Z","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":"a3ece3131b0abe25610db91318d7d946ebea31409f077da342876e6342da40b2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2014-08-22T21:28:17Z","title_canon_sha256":"40cfeca5999d52191796047ca9f6fc5b26d69f9c118b44f597aa44ea9372d151"},"schema_version":"1.0","source":{"id":"1408.5434","kind":"arxiv","version":2}},"canonical_sha256":"b62e19fbdc55ca80efecf049bf0d6b3ec33325bff97a21367c18ea916b1abb5b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b62e19fbdc55ca80efecf049bf0d6b3ec33325bff97a21367c18ea916b1abb5b","first_computed_at":"2026-05-18T02:31:59.512627Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:31:59.512627Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"REixMcO2nUAwcJJWwaeTzMMDZ8rerH+dETQ/xWyoMzIqpevZU08ER1DpsUgoJeP8WVDk+alUVGlfU41nUVyWAA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:31:59.513340Z","signed_message":"canonical_sha256_bytes"},"source_id":"1408.5434","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:863f1be7d31ec8a68dbe6761722dd412ce12640085b6f6cf79e9487d39f008e3","sha256:e9179b9f96ad8872389910d64f02d7f5d0519cedcc98228e05da38f2a514503d"],"state_sha256":"84deb26c55aa5f7d61083fce55b383e3d348a37b72ca74a2b24390313a45284f"}