{"paper":{"title":"Algebras, Entanglement Islands, and Observers","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"hep-th","authors_text":"Hao Geng, Jiuci Xu, Yikun Jiang","submitted_at":"2025-06-13T18:00:00Z","abstract_excerpt":"Some recent work has postulated the existence of an \"observer\" for a consistent definition of subregion algebras in gravitational universes. The subregion algebras consist of operators dressed to this \"observer\" and are typically Type II von Neumann algebras. Nevertheless, as opposed to standard physical systems, such an \"observer\" was postulated to have a Hamiltonian $\\hat{H}_{\\text{obs}}$ linear in phase space variable. This linear form suggests that the complete dynamics of such an \"observer\" should also be controlled by an external system or some underlying degrees of freedom within the sy"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2506.12127","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2506.12127/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"}