{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:KNPZ4L4YLOCLYWKSPVAMTRQFOS","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":"9cb571810a574dc9e90dba77a72f6ad7a13c13f8d3b32d28cfc2b7b4ffab4c78","cross_cats_sorted":["gr-qc","physics.atom-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-02-06T21:00:03Z","title_canon_sha256":"24069d5a5ee2201e5442d3b04068f6292c69e09439d761ec79afd9290ce3758b"},"schema_version":"1.0","source":{"id":"1302.1579","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.1579","created_at":"2026-05-18T03:32:16Z"},{"alias_kind":"arxiv_version","alias_value":"1302.1579v2","created_at":"2026-05-18T03:32:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.1579","created_at":"2026-05-18T03:32:16Z"},{"alias_kind":"pith_short_12","alias_value":"KNPZ4L4YLOCL","created_at":"2026-05-18T12:27:51Z"},{"alias_kind":"pith_short_16","alias_value":"KNPZ4L4YLOCLYWKS","created_at":"2026-05-18T12:27:51Z"},{"alias_kind":"pith_short_8","alias_value":"KNPZ4L4Y","created_at":"2026-05-18T12:27:51Z"}],"graph_snapshots":[{"event_id":"sha256:1f408d49eea02b576e735a857c8b261ddc22e7e9daf625b0df92c335077e14b9","target":"graph","created_at":"2026-05-18T03:32:16Z","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":"A cosmic scalar field evolving very slowly in time can account for the observed dark energy of the Universe. Unlike a cosmological constant, an evolving scalar field also has local spatial gradients due to gravity. If the scalar field has a minimal derivative coupling to electromagnetism, it will cause modifications of Maxwell's equations. In particular, in the presence of a scalar field gradient generated by Earth's gravity, regions with a magnetic field appear to be electrically charged and regions with a static electric field appear to contain electric currents. We propose experiments to de","authors_text":"Michael V. Romalis, Robert R. Caldwell","cross_cats":["gr-qc","physics.atom-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-02-06T21:00:03Z","title":"Laboratory search for a quintessence field"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.1579","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:cb115bd1756be24ad1d53fbff7201853d73d19ece67287d61e771e68b1483d95","target":"record","created_at":"2026-05-18T03:32:16Z","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":"9cb571810a574dc9e90dba77a72f6ad7a13c13f8d3b32d28cfc2b7b4ffab4c78","cross_cats_sorted":["gr-qc","physics.atom-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-02-06T21:00:03Z","title_canon_sha256":"24069d5a5ee2201e5442d3b04068f6292c69e09439d761ec79afd9290ce3758b"},"schema_version":"1.0","source":{"id":"1302.1579","kind":"arxiv","version":2}},"canonical_sha256":"535f9e2f985b84bc59527d40c9c60574b784057a7961d2ed6da8a7a7396c1a8e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"535f9e2f985b84bc59527d40c9c60574b784057a7961d2ed6da8a7a7396c1a8e","first_computed_at":"2026-05-18T03:32:16.692620Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:32:16.692620Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+RBIrY7b08GgG4T2ocePVFJL2yibWdMy0nox4M/C8RCHZy5RfA58o+x0rFX1eNPONGdB5jHeeW4fSLPaP/IKDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:32:16.693384Z","signed_message":"canonical_sha256_bytes"},"source_id":"1302.1579","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cb115bd1756be24ad1d53fbff7201853d73d19ece67287d61e771e68b1483d95","sha256:1f408d49eea02b576e735a857c8b261ddc22e7e9daf625b0df92c335077e14b9"],"state_sha256":"d93599a199ef4e49360a0e9eb38863fb96761f08e502f3e315a4777d28636d42"}