{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:7IA5GXFJQISLILDFEF7NDWVEZU","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":"997ee41aa382f6f6242226c01079148b2607e2de536629340fb5127df211770a","cross_cats_sorted":["gr-qc","hep-ph","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-14T22:39:47Z","title_canon_sha256":"c4ec50593896c9817b8762db5dc77e059b10d73cec336262211d1de5068ad1ce"},"schema_version":"1.0","source":{"id":"0909.2684","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0909.2684","created_at":"2026-05-18T02:24:47Z"},{"alias_kind":"arxiv_version","alias_value":"0909.2684v4","created_at":"2026-05-18T02:24:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0909.2684","created_at":"2026-05-18T02:24:47Z"},{"alias_kind":"pith_short_12","alias_value":"7IA5GXFJQISL","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"7IA5GXFJQISLILDF","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"7IA5GXFJ","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:0729e4efac24b54d741b898d419a886d55354d899b7c41a37cad5ffc3bae158d","target":"graph","created_at":"2026-05-18T02:24:47Z","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 origin of the observed dark energy could be explained entirely within the standard model, with no new fields required. We show how the low-energy sector of the chiral QCD Lagrangian, once embedded in a non-trivial spacetime, gives rise to a cosmological vacuum energy density which can be can be presented entirely in terms of QCD parameters and the Hubble constant $H$ as $\\rho_\\Lambda \\simeq H \\cdot m_q\\la\\bar{q}q\\ra /m_{\\eta'} \\sim (4.3\\cdot 10^{-3} \\text{eV})^4$. In this work we focus on the dynamics of the ghost fields that are essential ingredients of the aforementioned Lagrangian. In p","authors_text":"Ariel R. Zhitnitsky, Federico R. Urban","cross_cats":["gr-qc","hep-ph","hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-14T22:39:47Z","title":"The QCD nature of Dark Energy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0909.2684","kind":"arxiv","version":4},"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":"sha256:44c790090438e99e4c4150b15f24d7ef184857b6c664566a668da8cffd8232e8","target":"record","created_at":"2026-05-18T02:24:47Z","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":"997ee41aa382f6f6242226c01079148b2607e2de536629340fb5127df211770a","cross_cats_sorted":["gr-qc","hep-ph","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2009-09-14T22:39:47Z","title_canon_sha256":"c4ec50593896c9817b8762db5dc77e059b10d73cec336262211d1de5068ad1ce"},"schema_version":"1.0","source":{"id":"0909.2684","kind":"arxiv","version":4}},"canonical_sha256":"fa01d35ca98224b42c65217ed1daa4cd273e16fa984cf3551117334307ab4956","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fa01d35ca98224b42c65217ed1daa4cd273e16fa984cf3551117334307ab4956","first_computed_at":"2026-05-18T02:24:47.184410Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:24:47.184410Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5T+QM4kk7FQwMGziGXNzmFND9Q2uUTBFI/kF1TEgOBAHHwRouG08Nyx6d3mD08bv0nEjrBIlIRHaGPdbnsQODA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:24:47.185246Z","signed_message":"canonical_sha256_bytes"},"source_id":"0909.2684","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:44c790090438e99e4c4150b15f24d7ef184857b6c664566a668da8cffd8232e8","sha256:0729e4efac24b54d741b898d419a886d55354d899b7c41a37cad5ffc3bae158d"],"state_sha256":"fe116e82e132c1549fdda5c2aa1f6279df7c43677cc1633ff47d18f1780ff7b9"}