{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2006:E7LQQR3N3XFTLTKH4SLCCVJDFF","short_pith_number":"pith:E7LQQR3N","schema_version":"1.0","canonical_sha256":"27d708476dddcb35cd47e49621552329422477caacbc3abef61e8e220b911730","source":{"kind":"arxiv","id":"quant-ph/0609190","version":3},"attestation_state":"computed","paper":{"title":"Quasiclassical Coarse Graining and Thermodynamic Entropy","license":"","headline":"","cross_cats":["cond-mat.stat-mech","gr-qc","hep-th"],"primary_cat":"quant-ph","authors_text":"James Hartle (University of California Santa Barbara), Murray Gell-Mann (Santa Fe Institute)","submitted_at":"2006-09-25T18:50:50Z","abstract_excerpt":"Our everyday descriptions of the universe are highly coarse-grained, following only a tiny fraction of the variables necessary for a perfectly fine-grained description. Coarse graining in classical physics is made natural by our limited powers of observation and computation. But in the modern quantum mechanics of closed systems, some measure of coarse graining is inescapable because there are no non-trivial, probabilistic, fine-grained descriptions. This essay explores the consequences of that fact. Quantum theory allows for various coarse-grained descriptions some of which are mutually incomp"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"quant-ph/0609190","kind":"arxiv","version":3},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2006-09-25T18:50:50Z","cross_cats_sorted":["cond-mat.stat-mech","gr-qc","hep-th"],"title_canon_sha256":"c7dfa9f0e3d2ee295b6996718a7b6e24780c6aeda957b2cf79077510cc0b1788","abstract_canon_sha256":"56d3f76c856322dc0d0d76eacbffaf8d0df5f4a6152f2be36c75ba94b3f2e54a"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:28:59.848265Z","signature_b64":"1LqIwdPDevhEugoCC4oFGCeoN8zhyAv7QzrD64ec+gAyD2dryEqiuPm/SV90uTzXxuht6NjoYuuoHlRKlf1jAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"27d708476dddcb35cd47e49621552329422477caacbc3abef61e8e220b911730","last_reissued_at":"2026-07-04T15:28:59.847823Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:28:59.847823Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Quasiclassical Coarse Graining and Thermodynamic Entropy","license":"","headline":"","cross_cats":["cond-mat.stat-mech","gr-qc","hep-th"],"primary_cat":"quant-ph","authors_text":"James Hartle (University of California Santa Barbara), Murray Gell-Mann (Santa Fe Institute)","submitted_at":"2006-09-25T18:50:50Z","abstract_excerpt":"Our everyday descriptions of the universe are highly coarse-grained, following only a tiny fraction of the variables necessary for a perfectly fine-grained description. Coarse graining in classical physics is made natural by our limited powers of observation and computation. But in the modern quantum mechanics of closed systems, some measure of coarse graining is inescapable because there are no non-trivial, probabilistic, fine-grained descriptions. This essay explores the consequences of that fact. Quantum theory allows for various coarse-grained descriptions some of which are mutually incomp"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0609190","kind":"arxiv","version":3},"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/quant-ph/0609190/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"quant-ph/0609190","created_at":"2026-07-04T15:28:59.847885+00:00"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0609190v3","created_at":"2026-07-04T15:28:59.847885+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0609190","created_at":"2026-07-04T15:28:59.847885+00:00"},{"alias_kind":"pith_short_12","alias_value":"E7LQQR3N3XFT","created_at":"2026-07-04T15:28:59.847885+00:00"},{"alias_kind":"pith_short_16","alias_value":"E7LQQR3N3XFTLTKH","created_at":"2026-07-04T15:28:59.847885+00:00"},{"alias_kind":"pith_short_8","alias_value":"E7LQQR3N","created_at":"2026-07-04T15:28:59.847885+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2506.15663","citing_title":"Wavefunction branches demand a definition!","ref_index":16,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/E7LQQR3N3XFTLTKH4SLCCVJDFF","json":"https://pith.science/pith/E7LQQR3N3XFTLTKH4SLCCVJDFF.json","graph_json":"https://pith.science/api/pith-number/E7LQQR3N3XFTLTKH4SLCCVJDFF/graph.json","events_json":"https://pith.science/api/pith-number/E7LQQR3N3XFTLTKH4SLCCVJDFF/events.json","paper":"https://pith.science/paper/E7LQQR3N"},"agent_actions":{"view_html":"https://pith.science/pith/E7LQQR3N3XFTLTKH4SLCCVJDFF","download_json":"https://pith.science/pith/E7LQQR3N3XFTLTKH4SLCCVJDFF.json","view_paper":"https://pith.science/paper/E7LQQR3N","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=quant-ph/0609190&json=true","fetch_graph":"https://pith.science/api/pith-number/E7LQQR3N3XFTLTKH4SLCCVJDFF/graph.json","fetch_events":"https://pith.science/api/pith-number/E7LQQR3N3XFTLTKH4SLCCVJDFF/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/E7LQQR3N3XFTLTKH4SLCCVJDFF/action/timestamp_anchor","attest_storage":"https://pith.science/pith/E7LQQR3N3XFTLTKH4SLCCVJDFF/action/storage_attestation","attest_author":"https://pith.science/pith/E7LQQR3N3XFTLTKH4SLCCVJDFF/action/author_attestation","sign_citation":"https://pith.science/pith/E7LQQR3N3XFTLTKH4SLCCVJDFF/action/citation_signature","submit_replication":"https://pith.science/pith/E7LQQR3N3XFTLTKH4SLCCVJDFF/action/replication_record"}},"created_at":"2026-07-04T15:28:59.847885+00:00","updated_at":"2026-07-04T15:28:59.847885+00:00"}