{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:T75O3J3QWFQWLXVZDXM4APF6FI","short_pith_number":"pith:T75O3J3Q","canonical_record":{"source":{"id":"2607.08204","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SY","submitted_at":"2026-07-09T08:02:53Z","cross_cats_sorted":["cs.SY"],"title_canon_sha256":"d244f8fd6242bea49dbfcaa74dffa7e6b95c66f843869decfa2b8ac0be185620","abstract_canon_sha256":"9d9111bdd103aec6951662cf7edb19aafab42b1d853fbb7efdf3a90d5870b12c"},"schema_version":"1.0"},"canonical_sha256":"9ffaeda770b16165deb91dd9c03cbe2a0441bb44c45d8a57c383e38f235000ce","source":{"kind":"arxiv","id":"2607.08204","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.08204","created_at":"2026-07-10T01:19:29Z"},{"alias_kind":"arxiv_version","alias_value":"2607.08204v1","created_at":"2026-07-10T01:19:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.08204","created_at":"2026-07-10T01:19:29Z"},{"alias_kind":"pith_short_12","alias_value":"T75O3J3QWFQW","created_at":"2026-07-10T01:19:29Z"},{"alias_kind":"pith_short_16","alias_value":"T75O3J3QWFQWLXVZ","created_at":"2026-07-10T01:19:29Z"},{"alias_kind":"pith_short_8","alias_value":"T75O3J3Q","created_at":"2026-07-10T01:19:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:T75O3J3QWFQWLXVZDXM4APF6FI","target":"record","payload":{"canonical_record":{"source":{"id":"2607.08204","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SY","submitted_at":"2026-07-09T08:02:53Z","cross_cats_sorted":["cs.SY"],"title_canon_sha256":"d244f8fd6242bea49dbfcaa74dffa7e6b95c66f843869decfa2b8ac0be185620","abstract_canon_sha256":"9d9111bdd103aec6951662cf7edb19aafab42b1d853fbb7efdf3a90d5870b12c"},"schema_version":"1.0"},"canonical_sha256":"9ffaeda770b16165deb91dd9c03cbe2a0441bb44c45d8a57c383e38f235000ce","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-10T01:19:29.661131Z","signature_b64":"qomQ/FD+9q7WSYcjUX0Heo6+zE9d38eKNgxvjt38lSqTR/tmsYdMpjFYJ3AAKYYV31KRdXv7FGjuWMOzv4PnDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9ffaeda770b16165deb91dd9c03cbe2a0441bb44c45d8a57c383e38f235000ce","last_reissued_at":"2026-07-10T01:19:29.660728Z","signature_status":"signed_v1","first_computed_at":"2026-07-10T01:19:29.660728Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2607.08204","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-10T01:19:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Hu6JsjExzY1523fAGN15JPCiUjneyA77rkrBE3+hOgiDwvmWaTeET00bUcxNEDLdYnzi6hZltDHBjievbrKjCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T03:26:28.578093Z"},"content_sha256":"e3adfec9479d5258156f876fe6d65702894954e1dfa575354fec50c7e97a2f2d","schema_version":"1.0","event_id":"sha256:e3adfec9479d5258156f876fe6d65702894954e1dfa575354fec50c7e97a2f2d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:T75O3J3QWFQWLXVZDXM4APF6FI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Data-Driven Critic-Free Policy Iteration for Continuous-Time Linear Quadratic Regulation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.SY"],"primary_cat":"eess.SY","authors_text":"Hongye Su, Jiacheng Wu, Yang Zhu","submitted_at":"2026-07-09T08:02:53Z","abstract_excerpt":"For continuous-time linear quadratic regulation with unknown system matrices, data-driven off-policy policy iteration typically estimates the value matrix and the improved feedback gain through a joint critic--actor regression. We show that the critic is not needed in the policy-improvement step. The key is to anchor the Riccati equation at a known stabilizing gain and express optimality as a policy-space residual. An endpoint null-space projection then removes the value-matrix term from the integral data equation. This yields a critic-free, actor-only least-squares update computed directly fr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.08204","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/2607.08204/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-10T01:19:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tebUzLTtW66nUWfPsIkh+Q9DpsF3ITmuEb8W7gsZpEtU/SU4fsksGcBcGJIsKr2DDDrxRBEdBQV3nFKErIHxCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T03:26:28.578884Z"},"content_sha256":"1b4f0a7d912b28d6303485914a5f429ff2e4356c71c33a361cae2e73fff6049d","schema_version":"1.0","event_id":"sha256:1b4f0a7d912b28d6303485914a5f429ff2e4356c71c33a361cae2e73fff6049d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/T75O3J3QWFQWLXVZDXM4APF6FI/bundle.json","state_url":"https://pith.science/pith/T75O3J3QWFQWLXVZDXM4APF6FI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/T75O3J3QWFQWLXVZDXM4APF6FI/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-09T03:26:28Z","links":{"resolver":"https://pith.science/pith/T75O3J3QWFQWLXVZDXM4APF6FI","bundle":"https://pith.science/pith/T75O3J3QWFQWLXVZDXM4APF6FI/bundle.json","state":"https://pith.science/pith/T75O3J3QWFQWLXVZDXM4APF6FI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/T75O3J3QWFQWLXVZDXM4APF6FI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:T75O3J3QWFQWLXVZDXM4APF6FI","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":"9d9111bdd103aec6951662cf7edb19aafab42b1d853fbb7efdf3a90d5870b12c","cross_cats_sorted":["cs.SY"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SY","submitted_at":"2026-07-09T08:02:53Z","title_canon_sha256":"d244f8fd6242bea49dbfcaa74dffa7e6b95c66f843869decfa2b8ac0be185620"},"schema_version":"1.0","source":{"id":"2607.08204","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.08204","created_at":"2026-07-10T01:19:29Z"},{"alias_kind":"arxiv_version","alias_value":"2607.08204v1","created_at":"2026-07-10T01:19:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.08204","created_at":"2026-07-10T01:19:29Z"},{"alias_kind":"pith_short_12","alias_value":"T75O3J3QWFQW","created_at":"2026-07-10T01:19:29Z"},{"alias_kind":"pith_short_16","alias_value":"T75O3J3QWFQWLXVZ","created_at":"2026-07-10T01:19:29Z"},{"alias_kind":"pith_short_8","alias_value":"T75O3J3Q","created_at":"2026-07-10T01:19:29Z"}],"graph_snapshots":[{"event_id":"sha256:1b4f0a7d912b28d6303485914a5f429ff2e4356c71c33a361cae2e73fff6049d","target":"graph","created_at":"2026-07-10T01:19:29Z","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/2607.08204/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"For continuous-time linear quadratic regulation with unknown system matrices, data-driven off-policy policy iteration typically estimates the value matrix and the improved feedback gain through a joint critic--actor regression. We show that the critic is not needed in the policy-improvement step. The key is to anchor the Riccati equation at a known stabilizing gain and express optimality as a policy-space residual. An endpoint null-space projection then removes the value-matrix term from the integral data equation. This yields a critic-free, actor-only least-squares update computed directly fr","authors_text":"Hongye Su, Jiacheng Wu, Yang Zhu","cross_cats":["cs.SY"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SY","submitted_at":"2026-07-09T08:02:53Z","title":"Data-Driven Critic-Free Policy Iteration for Continuous-Time Linear Quadratic Regulation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.08204","kind":"arxiv","version":1},"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:e3adfec9479d5258156f876fe6d65702894954e1dfa575354fec50c7e97a2f2d","target":"record","created_at":"2026-07-10T01:19:29Z","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":"9d9111bdd103aec6951662cf7edb19aafab42b1d853fbb7efdf3a90d5870b12c","cross_cats_sorted":["cs.SY"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.SY","submitted_at":"2026-07-09T08:02:53Z","title_canon_sha256":"d244f8fd6242bea49dbfcaa74dffa7e6b95c66f843869decfa2b8ac0be185620"},"schema_version":"1.0","source":{"id":"2607.08204","kind":"arxiv","version":1}},"canonical_sha256":"9ffaeda770b16165deb91dd9c03cbe2a0441bb44c45d8a57c383e38f235000ce","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9ffaeda770b16165deb91dd9c03cbe2a0441bb44c45d8a57c383e38f235000ce","first_computed_at":"2026-07-10T01:19:29.660728Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-10T01:19:29.660728Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"qomQ/FD+9q7WSYcjUX0Heo6+zE9d38eKNgxvjt38lSqTR/tmsYdMpjFYJ3AAKYYV31KRdXv7FGjuWMOzv4PnDQ==","signature_status":"signed_v1","signed_at":"2026-07-10T01:19:29.661131Z","signed_message":"canonical_sha256_bytes"},"source_id":"2607.08204","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e3adfec9479d5258156f876fe6d65702894954e1dfa575354fec50c7e97a2f2d","sha256:1b4f0a7d912b28d6303485914a5f429ff2e4356c71c33a361cae2e73fff6049d"],"state_sha256":"35c0ee691917b42ef96938f6a253d8bd57f5ae6d637db28cbf4c692c51c39abd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BFwOzMS5m6LP4HkjjPlzPOGjgFLDFrf0tTGrX1ngUv3e730Mk1spW/IIT7Ry+CILsEYOwIEarm83qpnbN2eQCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-09T03:26:28.582928Z","bundle_sha256":"0c05a2866b5ca7617b414b867ea024ab56c36653195d964d91f49c3a5fe9dde4"}}