{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:ZU5FTAWFU5TGKUAOU4RAYPBX6S","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":"be1ed24f64d35e58f769bc9f4ae3ca666aa50c62d3573c74f77433b39ad459c1","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2017-11-22T18:37:59Z","title_canon_sha256":"546e1d051a5ba6eb62a2086a42a3582c0ba8695cccf25f7b59c7c791e3755e58"},"schema_version":"1.0","source":{"id":"1711.08441","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1711.08441","created_at":"2026-05-18T00:23:22Z"},{"alias_kind":"arxiv_version","alias_value":"1711.08441v2","created_at":"2026-05-18T00:23:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1711.08441","created_at":"2026-05-18T00:23:22Z"},{"alias_kind":"pith_short_12","alias_value":"ZU5FTAWFU5TG","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_16","alias_value":"ZU5FTAWFU5TGKUAO","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_8","alias_value":"ZU5FTAWF","created_at":"2026-05-18T12:31:59Z"}],"graph_snapshots":[{"event_id":"sha256:76eb61676586af6a02c160acbe025db07daffc7fc805e665f9f9c76207717aaa","target":"graph","created_at":"2026-05-18T00:23:22Z","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 consider the possibility that the primordial curvature perturbation is direction-dependent. To first order this is parameterised by a quadrupolar modulation of the power spectrum and results in statistical anisotropy of the CMB, which can be quantified using `bipolar spherical harmonics'. We compute these for the Planck DR2-2015 SMICA map and estimate the noise covariance from Planck Full Focal Plane 9 simulations. A constant quadrupolar modulation is detected with 2.2 sigma significance, dropping to 2 sigma when the primordial power is assumed to scale with wave number k as a power law. Go","authors_text":"Amel Durakovic, Paul Hunt, Subir Sarkar, Suvodip Mukherjee, Tarun Souradeep","cross_cats":["gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2017-11-22T18:37:59Z","title":"Reconstruction of a direction-dependent primordial power spectrum from Planck CMB data"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1711.08441","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":"sha256:69b8c1410fd3e391c77ffdede97b8703f347cfe47a84bf771cfc8e8f55a6fc62","target":"record","created_at":"2026-05-18T00:23:22Z","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":"be1ed24f64d35e58f769bc9f4ae3ca666aa50c62d3573c74f77433b39ad459c1","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2017-11-22T18:37:59Z","title_canon_sha256":"546e1d051a5ba6eb62a2086a42a3582c0ba8695cccf25f7b59c7c791e3755e58"},"schema_version":"1.0","source":{"id":"1711.08441","kind":"arxiv","version":2}},"canonical_sha256":"cd3a5982c5a76665500ea7220c3c37f48adc04efa2f1b8aafa79f233e8bec901","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cd3a5982c5a76665500ea7220c3c37f48adc04efa2f1b8aafa79f233e8bec901","first_computed_at":"2026-05-18T00:23:22.807632Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:23:22.807632Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"57Tf5nSt0rqZx8iSh9xL3xytSVlROHLA36iCOi+cybbO1BfrcT82gxzugi0Go871tl63y276hmMtfxmTqtKQBg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:23:22.808297Z","signed_message":"canonical_sha256_bytes"},"source_id":"1711.08441","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:69b8c1410fd3e391c77ffdede97b8703f347cfe47a84bf771cfc8e8f55a6fc62","sha256:76eb61676586af6a02c160acbe025db07daffc7fc805e665f9f9c76207717aaa"],"state_sha256":"c3f0acdd04e41a1e51e0865a4c0dede4e6a0a14c7ea573ca1944e1c31da67cab"}