{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:BJP5Q54C3Z4SVNAV62IHWIGDSW","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":"d23a89f2cb88bb7bfe4ddccc8b1e55ebf78c6e7bc6335a436f3e5b252b4b6215","cross_cats_sorted":["cond-mat.str-el","hep-ph","nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2021-04-13T18:20:51Z","title_canon_sha256":"086332d75ca37d871212846c6f989aa786c58de5238eb6327c534200f9fa33b4"},"schema_version":"1.0","source":{"id":"2104.06435","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2104.06435","created_at":"2026-07-05T03:43:01Z"},{"alias_kind":"arxiv_version","alias_value":"2104.06435v3","created_at":"2026-07-05T03:43:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2104.06435","created_at":"2026-07-05T03:43:01Z"},{"alias_kind":"pith_short_12","alias_value":"BJP5Q54C3Z4S","created_at":"2026-07-05T03:43:01Z"},{"alias_kind":"pith_short_16","alias_value":"BJP5Q54C3Z4SVNAV","created_at":"2026-07-05T03:43:01Z"},{"alias_kind":"pith_short_8","alias_value":"BJP5Q54C","created_at":"2026-07-05T03:43:01Z"}],"graph_snapshots":[{"event_id":"sha256:734e4d5f22149176a7a3076ad628c95ecdfd1c6bb44097ef793669a0cc402866","target":"graph","created_at":"2026-07-05T03:43:01Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2104.06435/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"I derive an exact integral expression for the ratio of shear viscosity over entropy density $\\frac{\\eta}{s}$ for the massless (critical) O(N) model at large N with quartic interactions. The calculation is set up and performed entirely from the field theory side using a non-perturbative resummation scheme that captures all contributions to leading order in large N. In 2+1d, $\\frac{\\eta}{s}$ is evaluated numerically at all values of the coupling. For infinite coupling, I find $\\frac{\\eta}{s}\\simeq 0.42(1)\\times N$. I show that this strong coupling result for the viscosity is universal for a larg","authors_text":"Paul Romatschke","cross_cats":["cond-mat.str-el","hep-ph","nucl-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2021-04-13T18:20:51Z","title":"Shear Viscosity at Infinite Coupling: A Field Theory Calculation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2104.06435","kind":"arxiv","version":3},"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:cf59f579743ffac48900be45d5e8dff83ae67c6a635e62c3d4f3b502380b38a4","target":"record","created_at":"2026-07-05T03:43:01Z","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":"d23a89f2cb88bb7bfe4ddccc8b1e55ebf78c6e7bc6335a436f3e5b252b4b6215","cross_cats_sorted":["cond-mat.str-el","hep-ph","nucl-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2021-04-13T18:20:51Z","title_canon_sha256":"086332d75ca37d871212846c6f989aa786c58de5238eb6327c534200f9fa33b4"},"schema_version":"1.0","source":{"id":"2104.06435","kind":"arxiv","version":3}},"canonical_sha256":"0a5fd87782de792ab415f6907b20c3959af1448cac6faa45bd4613404036ffb4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0a5fd87782de792ab415f6907b20c3959af1448cac6faa45bd4613404036ffb4","first_computed_at":"2026-07-05T03:43:01.820132Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:43:01.820132Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xqiqFBtUz+Mq2zKf18t4XNZyuxCZk2pYHraSh3/fAV7AnvlnrWf12xdCX3981qp9YlgwkDitC+LjZY1fqgExDQ==","signature_status":"signed_v1","signed_at":"2026-07-05T03:43:01.820616Z","signed_message":"canonical_sha256_bytes"},"source_id":"2104.06435","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cf59f579743ffac48900be45d5e8dff83ae67c6a635e62c3d4f3b502380b38a4","sha256:734e4d5f22149176a7a3076ad628c95ecdfd1c6bb44097ef793669a0cc402866"],"state_sha256":"fc0cc0214ead6dcbedfd00a17a01389e0d9d64a73b9e75fda1974e03d12a7707"}