{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:KBAWHQQTXVNSC2EGS3IHBXUQNW","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":"bbb3a5b3973924b76e6837b8d860eedcd391a77ba4386a8dffec71b7bc1f6dd3","cross_cats_sorted":["astro-ph.CO","hep-th"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"gr-qc","submitted_at":"2024-07-11T13:09:04Z","title_canon_sha256":"3eecff8f99a5623f1f34d747091691de1458aa98bec9d1006fc1175586a829ca"},"schema_version":"1.0","source":{"id":"2407.08472","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2407.08472","created_at":"2026-07-05T09:49:43Z"},{"alias_kind":"arxiv_version","alias_value":"2407.08472v2","created_at":"2026-07-05T09:49:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2407.08472","created_at":"2026-07-05T09:49:43Z"},{"alias_kind":"pith_short_12","alias_value":"KBAWHQQTXVNS","created_at":"2026-07-05T09:49:43Z"},{"alias_kind":"pith_short_16","alias_value":"KBAWHQQTXVNSC2EG","created_at":"2026-07-05T09:49:43Z"},{"alias_kind":"pith_short_8","alias_value":"KBAWHQQT","created_at":"2026-07-05T09:49:43Z"}],"graph_snapshots":[{"event_id":"sha256:d6021a8823d5cc2c8db181050c9b2e6925b7e2d8966b8cc6806d70e8d321632b","target":"graph","created_at":"2026-07-05T09:49:43Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2407.08472/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Primordial gravitational waves, after they enter the horizon and decay away, leave a residual displacement in test particles: a memory, in analogy with gravitational waves generated by astrophysical sources. The late-time distance between test particles is related to the one at early times by $\\xi^i_{\\rm late} = \\frac{a_{\\rm late}}{a_{\\rm early}} (\\delta^i_j -\\frac12 \\bar h^i_j)\\xi^j_{\\rm early}$. Therefore, the deformation of an initial spherical shell does not depend on the cosmological evolution, but only on the primordial value $\\bar h^i_{j}$ of the gravitational wave. The memory is thus r","authors_text":"Filippo Vernizzi, Paolo Creminelli","cross_cats":["astro-ph.CO","hep-th"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"gr-qc","submitted_at":"2024-07-11T13:09:04Z","title":"The Memory of Primordial Gravitational Waves"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2407.08472","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":"sha256:42a89569c19308825f22d6527be3ce95edf74c0ae170705e56413300d0c839dc","target":"record","created_at":"2026-07-05T09:49:43Z","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":"bbb3a5b3973924b76e6837b8d860eedcd391a77ba4386a8dffec71b7bc1f6dd3","cross_cats_sorted":["astro-ph.CO","hep-th"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"gr-qc","submitted_at":"2024-07-11T13:09:04Z","title_canon_sha256":"3eecff8f99a5623f1f34d747091691de1458aa98bec9d1006fc1175586a829ca"},"schema_version":"1.0","source":{"id":"2407.08472","kind":"arxiv","version":2}},"canonical_sha256":"504163c213bd5b21688696d070de906db0805b1c34203d2e5c734ae2bbc6fc14","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"504163c213bd5b21688696d070de906db0805b1c34203d2e5c734ae2bbc6fc14","first_computed_at":"2026-07-05T09:49:43.949952Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T09:49:43.949952Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8fiSKGFLhuGSpXnWq6XDBh9lBIfZr+tYB1OND1k0HppJgfTtTU3TE+QJL2B0OuK1AYU8WV5jEVNozivSRtBkDA==","signature_status":"signed_v1","signed_at":"2026-07-05T09:49:43.950447Z","signed_message":"canonical_sha256_bytes"},"source_id":"2407.08472","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:42a89569c19308825f22d6527be3ce95edf74c0ae170705e56413300d0c839dc","sha256:d6021a8823d5cc2c8db181050c9b2e6925b7e2d8966b8cc6806d70e8d321632b"],"state_sha256":"04b543817517e0b5888c8c235a1ad2c31cdeed9923fa65149011de06f4c3c718"}