{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:XL2E2GQGRGL3SYYPWQ3MNSYYF5","short_pith_number":"pith:XL2E2GQG","canonical_record":{"source":{"id":"1906.07010","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-06-17T13:03:05Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"d3b4a211a189d6d483bc0b6ede7c6e22a1b0fc598f3f4075d85dcc5cd714e5e2","abstract_canon_sha256":"953f62d88defc1110aebc0970a4da299f75531e86d57615f68f8f5ed7093a2d6"},"schema_version":"1.0"},"canonical_sha256":"baf44d1a068997b9630fb436c6cb182f7bc5d0b4cd8f4a6848e7d59fbf36e3d5","source":{"kind":"arxiv","id":"1906.07010","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1906.07010","created_at":"2026-05-17T23:39:43Z"},{"alias_kind":"arxiv_version","alias_value":"1906.07010v1","created_at":"2026-05-17T23:39:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1906.07010","created_at":"2026-05-17T23:39:43Z"},{"alias_kind":"pith_short_12","alias_value":"XL2E2GQGRGL3","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_16","alias_value":"XL2E2GQGRGL3SYYP","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_8","alias_value":"XL2E2GQG","created_at":"2026-05-18T12:33:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:XL2E2GQGRGL3SYYPWQ3MNSYYF5","target":"record","payload":{"canonical_record":{"source":{"id":"1906.07010","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-06-17T13:03:05Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"d3b4a211a189d6d483bc0b6ede7c6e22a1b0fc598f3f4075d85dcc5cd714e5e2","abstract_canon_sha256":"953f62d88defc1110aebc0970a4da299f75531e86d57615f68f8f5ed7093a2d6"},"schema_version":"1.0"},"canonical_sha256":"baf44d1a068997b9630fb436c6cb182f7bc5d0b4cd8f4a6848e7d59fbf36e3d5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:39:43.063221Z","signature_b64":"MxOjRhDn83M3Ew+N2QEEY7FGlCjBadoWUjk0/asitY84cylB/+5cfBSYrJGZWr+VZZduvSsdAGD1aKiGelmhBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"baf44d1a068997b9630fb436c6cb182f7bc5d0b4cd8f4a6848e7d59fbf36e3d5","last_reissued_at":"2026-05-17T23:39:43.062717Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:39:43.062717Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1906.07010","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":"2026-05-17T23:39:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jAxEsWEFyyzZcKT4O+mkKRjY+tWheR78c2ZvTBrNS7stjSCs8AMAdoSek8m++Jqd+Rpfsgfs547vw2vXZLvdDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:48:42.140077Z"},"content_sha256":"f1404be3252cfbda8cb6ee6a19df9b25d93648fb5378a74621bfd122dec7a068","schema_version":"1.0","event_id":"sha256:f1404be3252cfbda8cb6ee6a19df9b25d93648fb5378a74621bfd122dec7a068"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:XL2E2GQGRGL3SYYPWQ3MNSYYF5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Systematic effects induced by Half Wave Plate precession into Cosmic Microwave Background polarization measurements","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.IM","authors_text":"F. Columbro, F. Piacentini, G. D'Alessandro, L. Mele, L. Pagano, P. De Bernardis, S. Masi","submitted_at":"2019-06-17T13:03:05Z","abstract_excerpt":"The most accessible method to measure polarization features of the CMB radiation is by means of a Stokes Polarimeter based on the rotation of an Half Wave Plate. The current observational cosmology is starting to be limited by the presence of systematic effects. The Stokes polarimeter with a rotating Half Wave Plate (HWP) has the advantage of mitigating a long list of potential systematics, by modulation of the linearly polarized component of the radiation, but the presence of the rotating HWP can by itself introduce new systematic effects, which must be under control, representing one of the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1906.07010","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":"2026-05-17T23:39:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lIfByCaGGH13mfDqB5Tl0ypi2325w5orvXF5qe7qsRqDF1Mg82QZ0lBU4oygni8xzi0Hnu2xYMeDmjlf8kuNDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:48:42.140574Z"},"content_sha256":"d813433fdf3ece3e399f982d86386eeb823f9d6f9a232359c2d26e8f64615818","schema_version":"1.0","event_id":"sha256:d813433fdf3ece3e399f982d86386eeb823f9d6f9a232359c2d26e8f64615818"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XL2E2GQGRGL3SYYPWQ3MNSYYF5/bundle.json","state_url":"https://pith.science/pith/XL2E2GQGRGL3SYYPWQ3MNSYYF5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XL2E2GQGRGL3SYYPWQ3MNSYYF5/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":"2026-05-25T18:48:42Z","links":{"resolver":"https://pith.science/pith/XL2E2GQGRGL3SYYPWQ3MNSYYF5","bundle":"https://pith.science/pith/XL2E2GQGRGL3SYYPWQ3MNSYYF5/bundle.json","state":"https://pith.science/pith/XL2E2GQGRGL3SYYPWQ3MNSYYF5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XL2E2GQGRGL3SYYPWQ3MNSYYF5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:XL2E2GQGRGL3SYYPWQ3MNSYYF5","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":"953f62d88defc1110aebc0970a4da299f75531e86d57615f68f8f5ed7093a2d6","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-06-17T13:03:05Z","title_canon_sha256":"d3b4a211a189d6d483bc0b6ede7c6e22a1b0fc598f3f4075d85dcc5cd714e5e2"},"schema_version":"1.0","source":{"id":"1906.07010","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1906.07010","created_at":"2026-05-17T23:39:43Z"},{"alias_kind":"arxiv_version","alias_value":"1906.07010v1","created_at":"2026-05-17T23:39:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1906.07010","created_at":"2026-05-17T23:39:43Z"},{"alias_kind":"pith_short_12","alias_value":"XL2E2GQGRGL3","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_16","alias_value":"XL2E2GQGRGL3SYYP","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_8","alias_value":"XL2E2GQG","created_at":"2026-05-18T12:33:33Z"}],"graph_snapshots":[{"event_id":"sha256:d813433fdf3ece3e399f982d86386eeb823f9d6f9a232359c2d26e8f64615818","target":"graph","created_at":"2026-05-17T23:39:43Z","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":"The most accessible method to measure polarization features of the CMB radiation is by means of a Stokes Polarimeter based on the rotation of an Half Wave Plate. The current observational cosmology is starting to be limited by the presence of systematic effects. The Stokes polarimeter with a rotating Half Wave Plate (HWP) has the advantage of mitigating a long list of potential systematics, by modulation of the linearly polarized component of the radiation, but the presence of the rotating HWP can by itself introduce new systematic effects, which must be under control, representing one of the ","authors_text":"F. Columbro, F. Piacentini, G. D'Alessandro, L. Mele, L. Pagano, P. De Bernardis, S. Masi","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-06-17T13:03:05Z","title":"Systematic effects induced by Half Wave Plate precession into Cosmic Microwave Background polarization measurements"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1906.07010","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:f1404be3252cfbda8cb6ee6a19df9b25d93648fb5378a74621bfd122dec7a068","target":"record","created_at":"2026-05-17T23:39:43Z","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":"953f62d88defc1110aebc0970a4da299f75531e86d57615f68f8f5ed7093a2d6","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-06-17T13:03:05Z","title_canon_sha256":"d3b4a211a189d6d483bc0b6ede7c6e22a1b0fc598f3f4075d85dcc5cd714e5e2"},"schema_version":"1.0","source":{"id":"1906.07010","kind":"arxiv","version":1}},"canonical_sha256":"baf44d1a068997b9630fb436c6cb182f7bc5d0b4cd8f4a6848e7d59fbf36e3d5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"baf44d1a068997b9630fb436c6cb182f7bc5d0b4cd8f4a6848e7d59fbf36e3d5","first_computed_at":"2026-05-17T23:39:43.062717Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:39:43.062717Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MxOjRhDn83M3Ew+N2QEEY7FGlCjBadoWUjk0/asitY84cylB/+5cfBSYrJGZWr+VZZduvSsdAGD1aKiGelmhBg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:39:43.063221Z","signed_message":"canonical_sha256_bytes"},"source_id":"1906.07010","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f1404be3252cfbda8cb6ee6a19df9b25d93648fb5378a74621bfd122dec7a068","sha256:d813433fdf3ece3e399f982d86386eeb823f9d6f9a232359c2d26e8f64615818"],"state_sha256":"9b1a597cb0c00b54767cdfda705fce081683aec7f79133e884a4753c867718c8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XzpMfV2xcgFIL75kKeSDVFyvhSuW046N3/RvEM1rKLizPkSUFPgv5/w1ConozTpNE0T1AlPu9606Y9BYj/kuBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T18:48:42.144114Z","bundle_sha256":"0756bc2687f10fdee000fd15d3e3bcc821a73ed654e4c695f644d02fbe02e0f9"}}