{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:7MUBRH7ZAYBMN6GKBXO5G7ZY5D","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":"258842059d1afa387d7ad423f9dd6f2b525a102bbebb94707151a02652fe3a42","cross_cats_sorted":["gr-qc","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-11-19T15:04:56Z","title_canon_sha256":"d5e5575b54df2dbdee85b9ec25c9090f58a431d8c60ea4d6194c0eeb815f980b"},"schema_version":"1.0","source":{"id":"1311.4765","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1311.4765","created_at":"2026-05-18T02:55:10Z"},{"alias_kind":"arxiv_version","alias_value":"1311.4765v2","created_at":"2026-05-18T02:55:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1311.4765","created_at":"2026-05-18T02:55:10Z"},{"alias_kind":"pith_short_12","alias_value":"7MUBRH7ZAYBM","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_16","alias_value":"7MUBRH7ZAYBMN6GK","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_8","alias_value":"7MUBRH7Z","created_at":"2026-05-18T12:27:36Z"}],"graph_snapshots":[{"event_id":"sha256:c6a4ee067e597f276c16ab08866f8adbfa6d7d842de9a3d499b75686577702be","target":"graph","created_at":"2026-05-18T02:55:10Z","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 effective anisotropic stress or gravitational slip $\\eta=-\\Phi/\\Psi$ is a key variable in the characterisation of the physical origin of the dark energy, as it allows to test for a non-minimal coupling of the dark sector to gravity in the Jordan frame. It is however important to use a fully model-independent approach when measuring $\\eta$ to avoid introducing a theoretical bias into the results. In this paper we forecast the precision with which future large surveys can determine $\\eta$ in a way that only relies on directly observable quantities. In particular, we do not assume anything co","authors_text":"2), (2) U. Bologna, (3) U. Geneva, 4), (4) African Inst. Math. Sci., Adrian Vollmer (1) ((1) U. Heidelberg, Alejandro Guarnizo (1), Cape Town), ITP, Luca Amendola (1), Martin Kunz (3, Simone Fogli (1","cross_cats":["gr-qc","hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-11-19T15:04:56Z","title":"Model-independent constraints on the cosmological anisotropic stress"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.4765","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":"sha256:08bc107dd535291b8e78906d2a447de28192b69eeafc310cad2f0f06d5addbbf","target":"record","created_at":"2026-05-18T02:55:10Z","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":"258842059d1afa387d7ad423f9dd6f2b525a102bbebb94707151a02652fe3a42","cross_cats_sorted":["gr-qc","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-11-19T15:04:56Z","title_canon_sha256":"d5e5575b54df2dbdee85b9ec25c9090f58a431d8c60ea4d6194c0eeb815f980b"},"schema_version":"1.0","source":{"id":"1311.4765","kind":"arxiv","version":2}},"canonical_sha256":"fb28189ff90602c6f8ca0dddd37f38e8cac36ae6bf0012c52530b1bc512d53e8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fb28189ff90602c6f8ca0dddd37f38e8cac36ae6bf0012c52530b1bc512d53e8","first_computed_at":"2026-05-18T02:55:10.818097Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:55:10.818097Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jbs+YmgzS9wMe2gJ0fahybPDQf6G+FUoPnkr/FNOSJdh63ws1DwM8q6gw8mT2E1VBhc5BL883/SOmxOr+3tgAw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:55:10.818614Z","signed_message":"canonical_sha256_bytes"},"source_id":"1311.4765","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:08bc107dd535291b8e78906d2a447de28192b69eeafc310cad2f0f06d5addbbf","sha256:c6a4ee067e597f276c16ab08866f8adbfa6d7d842de9a3d499b75686577702be"],"state_sha256":"20874a78f9318bb3ea7a010f6a19d46f05c85eb173919537061cc37f173cc03a"}