{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:JFKXQSZ367US6YYH3HBSFQVP6U","short_pith_number":"pith:JFKXQSZ3","canonical_record":{"source":{"id":"2606.26987","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2026-06-25T13:01:11Z","cross_cats_sorted":["cs.AI"],"title_canon_sha256":"0218f1c9de04740cf5242debbad4cdf25c83049394ed6ff1e99e87c8ca50bd9c","abstract_canon_sha256":"f56e37471bf998f1a584e9ad0034a20796b53b53cbe11b72350ceed37046eac8"},"schema_version":"1.0"},"canonical_sha256":"4955784b3bf7e92f6307d9c322c2aff51bfdd4e3814ec101b211786ac1ad4f00","source":{"kind":"arxiv","id":"2606.26987","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.26987","created_at":"2026-06-26T01:16:06Z"},{"alias_kind":"arxiv_version","alias_value":"2606.26987v1","created_at":"2026-06-26T01:16:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.26987","created_at":"2026-06-26T01:16:06Z"},{"alias_kind":"pith_short_12","alias_value":"JFKXQSZ367US","created_at":"2026-06-26T01:16:06Z"},{"alias_kind":"pith_short_16","alias_value":"JFKXQSZ367US6YYH","created_at":"2026-06-26T01:16:06Z"},{"alias_kind":"pith_short_8","alias_value":"JFKXQSZ3","created_at":"2026-06-26T01:16:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:JFKXQSZ367US6YYH3HBSFQVP6U","target":"record","payload":{"canonical_record":{"source":{"id":"2606.26987","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2026-06-25T13:01:11Z","cross_cats_sorted":["cs.AI"],"title_canon_sha256":"0218f1c9de04740cf5242debbad4cdf25c83049394ed6ff1e99e87c8ca50bd9c","abstract_canon_sha256":"f56e37471bf998f1a584e9ad0034a20796b53b53cbe11b72350ceed37046eac8"},"schema_version":"1.0"},"canonical_sha256":"4955784b3bf7e92f6307d9c322c2aff51bfdd4e3814ec101b211786ac1ad4f00","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-26T01:16:06.025987Z","signature_b64":"NOXQdZVbg3OAaaAMyBj0cLl/8Jk94iKYRCfeDkmd0snS0WnlY2bU+jqOoCJEvrVuoi4cs4wPrfUhhn+anmNnBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4955784b3bf7e92f6307d9c322c2aff51bfdd4e3814ec101b211786ac1ad4f00","last_reissued_at":"2026-06-26T01:16:06.025608Z","signature_status":"signed_v1","first_computed_at":"2026-06-26T01:16:06.025608Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.26987","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":"2026-06-26T01:16:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"q0Q4X5lTi91BtKxkxO7O6gSwdoOiOspT3ZIt/m9LnaYnUxET1BHT17rAjTPqnwiGxxnNWH2fS8xNWdND5glyBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T01:37:08.147159Z"},"content_sha256":"b83cd7893eb5cbd01524cc662beee0e95cdc08655639e754fffb7acffcb1a701","schema_version":"1.0","event_id":"sha256:b83cd7893eb5cbd01524cc662beee0e95cdc08655639e754fffb7acffcb1a701"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:JFKXQSZ367US6YYH3HBSFQVP6U","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Where Do Models Find Happiness? Emotion Vectors in Open-Source LLMs","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.AI"],"primary_cat":"cs.CL","authors_text":"Mennatallah El-Assady, Rapha\\\"el Baur, Sinie van der Ben, Yannick Metz","submitted_at":"2026-06-25T13:01:11Z","abstract_excerpt":"Recent work identified emotion vectors in Claude Sonnet 4.5, which are internal representations that encode emotion concepts, causally influence behavior, and exhibit geometry mirroring human psychological structure. We test the generality of these findings in two open-weight models, Apertus-8B-Instruct-2509 and Gemma-4-E4B-it, extracting emotion contrast vectors across all layers, using two model-generated corpora. We recover valence geometry for both models, with peak PC1--valence correlations of $r = 0.76$ and $r = 0.83$, approaching the $r = 0.81$ reported for Claude.Beyond replication, we"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.26987","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/2606.26987/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":"2026-06-26T01:16:06Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"b2aXkXH2fBBWtdPrNrntqr+je4iIE720KdOzSBX6ycfDxpJg84Dq/OPO+ppUZGpSVeo02ocoia6h6teSNtkhDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T01:37:08.147566Z"},"content_sha256":"85c3a172b7ad6a5e5346dc156c6f6a94d9804811644d8eef113870a6a8ca11af","schema_version":"1.0","event_id":"sha256:85c3a172b7ad6a5e5346dc156c6f6a94d9804811644d8eef113870a6a8ca11af"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JFKXQSZ367US6YYH3HBSFQVP6U/bundle.json","state_url":"https://pith.science/pith/JFKXQSZ367US6YYH3HBSFQVP6U/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JFKXQSZ367US6YYH3HBSFQVP6U/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":"2026-06-28T01:37:08Z","links":{"resolver":"https://pith.science/pith/JFKXQSZ367US6YYH3HBSFQVP6U","bundle":"https://pith.science/pith/JFKXQSZ367US6YYH3HBSFQVP6U/bundle.json","state":"https://pith.science/pith/JFKXQSZ367US6YYH3HBSFQVP6U/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JFKXQSZ367US6YYH3HBSFQVP6U/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:JFKXQSZ367US6YYH3HBSFQVP6U","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":"f56e37471bf998f1a584e9ad0034a20796b53b53cbe11b72350ceed37046eac8","cross_cats_sorted":["cs.AI"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2026-06-25T13:01:11Z","title_canon_sha256":"0218f1c9de04740cf5242debbad4cdf25c83049394ed6ff1e99e87c8ca50bd9c"},"schema_version":"1.0","source":{"id":"2606.26987","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.26987","created_at":"2026-06-26T01:16:06Z"},{"alias_kind":"arxiv_version","alias_value":"2606.26987v1","created_at":"2026-06-26T01:16:06Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.26987","created_at":"2026-06-26T01:16:06Z"},{"alias_kind":"pith_short_12","alias_value":"JFKXQSZ367US","created_at":"2026-06-26T01:16:06Z"},{"alias_kind":"pith_short_16","alias_value":"JFKXQSZ367US6YYH","created_at":"2026-06-26T01:16:06Z"},{"alias_kind":"pith_short_8","alias_value":"JFKXQSZ3","created_at":"2026-06-26T01:16:06Z"}],"graph_snapshots":[{"event_id":"sha256:85c3a172b7ad6a5e5346dc156c6f6a94d9804811644d8eef113870a6a8ca11af","target":"graph","created_at":"2026-06-26T01:16:06Z","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/2606.26987/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Recent work identified emotion vectors in Claude Sonnet 4.5, which are internal representations that encode emotion concepts, causally influence behavior, and exhibit geometry mirroring human psychological structure. We test the generality of these findings in two open-weight models, Apertus-8B-Instruct-2509 and Gemma-4-E4B-it, extracting emotion contrast vectors across all layers, using two model-generated corpora. We recover valence geometry for both models, with peak PC1--valence correlations of $r = 0.76$ and $r = 0.83$, approaching the $r = 0.81$ reported for Claude.Beyond replication, we","authors_text":"Mennatallah El-Assady, Rapha\\\"el Baur, Sinie van der Ben, Yannick Metz","cross_cats":["cs.AI"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2026-06-25T13:01:11Z","title":"Where Do Models Find Happiness? Emotion Vectors in Open-Source LLMs"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.26987","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:b83cd7893eb5cbd01524cc662beee0e95cdc08655639e754fffb7acffcb1a701","target":"record","created_at":"2026-06-26T01:16:06Z","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":"f56e37471bf998f1a584e9ad0034a20796b53b53cbe11b72350ceed37046eac8","cross_cats_sorted":["cs.AI"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2026-06-25T13:01:11Z","title_canon_sha256":"0218f1c9de04740cf5242debbad4cdf25c83049394ed6ff1e99e87c8ca50bd9c"},"schema_version":"1.0","source":{"id":"2606.26987","kind":"arxiv","version":1}},"canonical_sha256":"4955784b3bf7e92f6307d9c322c2aff51bfdd4e3814ec101b211786ac1ad4f00","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4955784b3bf7e92f6307d9c322c2aff51bfdd4e3814ec101b211786ac1ad4f00","first_computed_at":"2026-06-26T01:16:06.025608Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-26T01:16:06.025608Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"NOXQdZVbg3OAaaAMyBj0cLl/8Jk94iKYRCfeDkmd0snS0WnlY2bU+jqOoCJEvrVuoi4cs4wPrfUhhn+anmNnBQ==","signature_status":"signed_v1","signed_at":"2026-06-26T01:16:06.025987Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.26987","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b83cd7893eb5cbd01524cc662beee0e95cdc08655639e754fffb7acffcb1a701","sha256:85c3a172b7ad6a5e5346dc156c6f6a94d9804811644d8eef113870a6a8ca11af"],"state_sha256":"fc7a25379e1e08762b137e39762861a2b00cfd5747ed9799e57ceb2e45d258d0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MQZ4+fY5P0DKQyAVQU9eAof+0vCM/D2xS4kQlhQFO5mGN5iMhS68Ub3FQ8QShV27HIJUB0zgBt5TYuKu3fb7CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-28T01:37:08.152945Z","bundle_sha256":"8d6869ad68e15780a9bc5da1a2d610c584ad615063fee2c584bbb186c064a4d7"}}