{"paper":{"title":"Quantum Information Dynamics of QED$_2$ in Expanding de Sitter Universe","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"De Sitter QED2 develops a pseudo-critical line that governs loss of adiabaticity and produces a detectable irreversibility front in relative entropy.","cross_cats":["gr-qc","hep-lat","nucl-th","quant-ph"],"primary_cat":"hep-th","authors_text":"Kazuki Ikeda, Yaron Oz","submitted_at":"2026-04-03T06:37:56Z","abstract_excerpt":"We study QED$_2$ in de Sitter space as a minimal interacting gauge theory in which cosmological expansion directly competes with quantum dynamics. In cosmic time, the hopping redshifts as $1/a(t)$ while the electric term grows as $g^2 a(t)$, sweeping the spectrum through a moving narrow-gap region in the $(\\tau,m)$ plane. Exact diagonalization shows that this defines a pseudo-critical line governing the loss of adiabaticity, excitation growth, and redshifted response. Using matrix-product states at a fixed mass, we separate the fixed-cutoff thermodynamic limit from the continuum extrapolation."},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"These results identify de Sitter QED₂ as a controlled setting for linking curved-space gauge dynamics, near-critical spectral structure, and operational irreversibility.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The lattice discretization with fixed mass and the continuum extrapolation accurately capture the infrared physics of continuum QED2 in de Sitter space without introducing artifacts that dominate the late-time dip and irreversibility front.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"In de Sitter QED2, a moving narrow-gap region creates a pseudo-critical line that governs loss of adiabaticity, excitation growth, and a detectable irreversibility front in relative entropy.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"De Sitter QED2 develops a pseudo-critical line that governs loss of adiabaticity and produces a detectable irreversibility front in relative entropy.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"a5abc3133c6b3589d491b78b9a412624924199c1d670074a4c281afd8056c51d"},"source":{"id":"2604.02777","kind":"arxiv","version":2},"verdict":{"id":"b25a23e5-3398-4c87-a4ea-9bab9392bd9c","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-13T18:43:55.195990Z","strongest_claim":"These results identify de Sitter QED₂ as a controlled setting for linking curved-space gauge dynamics, near-critical spectral structure, and operational irreversibility.","one_line_summary":"In de Sitter QED2, a moving narrow-gap region creates a pseudo-critical line that governs loss of adiabaticity, excitation growth, and a detectable irreversibility front in relative entropy.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The lattice discretization with fixed mass and the continuum extrapolation accurately capture the infrared physics of continuum QED2 in de Sitter space without introducing artifacts that dominate the late-time dip and irreversibility front.","pith_extraction_headline":"De Sitter QED2 develops a pseudo-critical line that governs loss of adiabaticity and produces a detectable irreversibility front in relative entropy."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2604.02777/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}