{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:DQ2K67BPLUZQCUU47MO6J3ETKE","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":"9a73c54b28c0d9cbf0509bce8018e35bf9b005d9ffc7e55ba80e68d167a075f4","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-04-28T09:51:17Z","title_canon_sha256":"54b456f6fc4df530550bb99deacf595b83cdb4cc44ef8537b2d9dc3e1c089a82"},"schema_version":"1.0","source":{"id":"1504.07397","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1504.07397","created_at":"2026-05-18T01:33:00Z"},{"alias_kind":"arxiv_version","alias_value":"1504.07397v2","created_at":"2026-05-18T01:33:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1504.07397","created_at":"2026-05-18T01:33:00Z"},{"alias_kind":"pith_short_12","alias_value":"DQ2K67BPLUZQ","created_at":"2026-05-18T12:29:17Z"},{"alias_kind":"pith_short_16","alias_value":"DQ2K67BPLUZQCUU4","created_at":"2026-05-18T12:29:17Z"},{"alias_kind":"pith_short_8","alias_value":"DQ2K67BP","created_at":"2026-05-18T12:29:17Z"}],"graph_snapshots":[{"event_id":"sha256:368c2b5b3d2b4a0a4d0bd22f3345a4bd8a606a21e810d1e8f0318ee4ac3ee32a","target":"graph","created_at":"2026-05-18T01:33:00Z","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":"An interaction between dark matter and dark energy is usually introduced by a phenomenological modification of the matter conservation equations, while the Einstein equations are left unchanged. Starting from some general and fundamental considerations, in this work it is shown that a coupling in the dark sector is likely to introduce new terms also in the gravitational dynamics. Specifically in the cosmological background equations a bulk dissipative pressure, characterizing viscous effects and able to suppress structure formation at small scales, should appear from the dark coupling. At the ","authors_text":"Nicola Tamanini","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-04-28T09:51:17Z","title":"On phenomenological models of dark energy interacting with dark matter"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1504.07397","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":"sha256:48167275db78259390dfc0e0b3c151c67eaac175bf415c11e87529d2bcb51dd1","target":"record","created_at":"2026-05-18T01:33:00Z","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":"9a73c54b28c0d9cbf0509bce8018e35bf9b005d9ffc7e55ba80e68d167a075f4","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-04-28T09:51:17Z","title_canon_sha256":"54b456f6fc4df530550bb99deacf595b83cdb4cc44ef8537b2d9dc3e1c089a82"},"schema_version":"1.0","source":{"id":"1504.07397","kind":"arxiv","version":2}},"canonical_sha256":"1c34af7c2f5d3301529cfb1de4ec93510a1323b6c354b97e136a6e47943fa0c7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1c34af7c2f5d3301529cfb1de4ec93510a1323b6c354b97e136a6e47943fa0c7","first_computed_at":"2026-05-18T01:33:00.783629Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:33:00.783629Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"cRUDVg4EhmP3laYhkmB1T3JskEt3p2afYtlb0ACnypV+tBjR+5iidEjSOrl/ZaT7cVzC3GNLcErbfdJ/IIi3AQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:33:00.784267Z","signed_message":"canonical_sha256_bytes"},"source_id":"1504.07397","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:48167275db78259390dfc0e0b3c151c67eaac175bf415c11e87529d2bcb51dd1","sha256:368c2b5b3d2b4a0a4d0bd22f3345a4bd8a606a21e810d1e8f0318ee4ac3ee32a"],"state_sha256":"e06fa198d92ca8bbe7b41daeb4b05137afee8de84631494fbf9b7e9c0c7b1cc8"}