{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:LOGDOGQJXTWCWDYJNLTWS65MH4","short_pith_number":"pith:LOGDOGQJ","canonical_record":{"source":{"id":"1509.06652","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-09-22T15:45:59Z","cross_cats_sorted":[],"title_canon_sha256":"025b607e8e5d171ae9c4e74ed3ad24b8d5fd672c089836e2eb203796739004cf","abstract_canon_sha256":"817a2899226cb02f80439017e5a93c2b785058c05f6d1512612af79009ae7242"},"schema_version":"1.0"},"canonical_sha256":"5b8c371a09bcec2b0f096ae7697bac3f168c964a23b4139db68bcaa68398dcd4","source":{"kind":"arxiv","id":"1509.06652","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.06652","created_at":"2026-05-18T00:40:14Z"},{"alias_kind":"arxiv_version","alias_value":"1509.06652v2","created_at":"2026-05-18T00:40:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.06652","created_at":"2026-05-18T00:40:14Z"},{"alias_kind":"pith_short_12","alias_value":"LOGDOGQJXTWC","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"LOGDOGQJXTWCWDYJ","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"LOGDOGQJ","created_at":"2026-05-18T12:29:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:LOGDOGQJXTWCWDYJNLTWS65MH4","target":"record","payload":{"canonical_record":{"source":{"id":"1509.06652","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-09-22T15:45:59Z","cross_cats_sorted":[],"title_canon_sha256":"025b607e8e5d171ae9c4e74ed3ad24b8d5fd672c089836e2eb203796739004cf","abstract_canon_sha256":"817a2899226cb02f80439017e5a93c2b785058c05f6d1512612af79009ae7242"},"schema_version":"1.0"},"canonical_sha256":"5b8c371a09bcec2b0f096ae7697bac3f168c964a23b4139db68bcaa68398dcd4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:40:14.160088Z","signature_b64":"CeLPXqwnLPqQVSEfbnCND91S9QJS9tqxGZWIkmPoKiEMi7iOURQqvu0b3/ekL/gd2eB4wJeh3QbUKJz7F1cfDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5b8c371a09bcec2b0f096ae7697bac3f168c964a23b4139db68bcaa68398dcd4","last_reissued_at":"2026-05-18T00:40:14.159420Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:40:14.159420Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1509.06652","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:40:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uQa0uaLuw4uTsdeUf2I7Gl0fkxj8TFXialvfVuh7DEWoPopryFMRR/VM95h77LMlytrEKdMsGzjZwE6DEzERBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T05:00:35.689591Z"},"content_sha256":"c50ff4674288e33df98fd176e8119105fb817162afcd82cbf0326c9350421192","schema_version":"1.0","event_id":"sha256:c50ff4674288e33df98fd176e8119105fb817162afcd82cbf0326c9350421192"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:LOGDOGQJXTWCWDYJNLTWS65MH4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Breaking of macroscopic centric symmetry in paraelectric phases of ferroelectric materials and implications for flexoelectricity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Alberto Biancoli, Chris M. Fancher, Dragan Damjanovic, Jacob L. Jones","submitted_at":"2015-09-22T15:45:59Z","abstract_excerpt":"A centrosymmetric stress cannot induce a polar response in centric materials, piezoelectricity is, for example, possible only in non-centrosymmetric structures. An exception is meta-materials with shape asymmetry, which may be polarized by stress even when the material is centric. In this case the mechanism is flexoelectricity, which relates polarization to a strain gradient. The flexoelectric response scales inversely with size, thus a large effect is expected in nanoscale materials. Recent experiments in polycrystalline, centrosymmetric perovskites [e.g., (Ba,Sr)TiO3] have indicated values o"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.06652","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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":"2026-05-18T00:40:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"X/JV+7nZT/3Zc9GcBqxiSo7xmupvmgzN7LgZwps4Txtf+KUMnwpnc92LBKGMyw6AaL0W+2IGMDhGV1NBXtaSAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T05:00:35.689950Z"},"content_sha256":"52e57b40a5f1b1709a5304de648c1a31c11b6bca919b80789e21fb8af32f0fb5","schema_version":"1.0","event_id":"sha256:52e57b40a5f1b1709a5304de648c1a31c11b6bca919b80789e21fb8af32f0fb5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/LOGDOGQJXTWCWDYJNLTWS65MH4/bundle.json","state_url":"https://pith.science/pith/LOGDOGQJXTWCWDYJNLTWS65MH4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/LOGDOGQJXTWCWDYJNLTWS65MH4/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":"2026-06-02T05:00:35Z","links":{"resolver":"https://pith.science/pith/LOGDOGQJXTWCWDYJNLTWS65MH4","bundle":"https://pith.science/pith/LOGDOGQJXTWCWDYJNLTWS65MH4/bundle.json","state":"https://pith.science/pith/LOGDOGQJXTWCWDYJNLTWS65MH4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/LOGDOGQJXTWCWDYJNLTWS65MH4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:LOGDOGQJXTWCWDYJNLTWS65MH4","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":"817a2899226cb02f80439017e5a93c2b785058c05f6d1512612af79009ae7242","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-09-22T15:45:59Z","title_canon_sha256":"025b607e8e5d171ae9c4e74ed3ad24b8d5fd672c089836e2eb203796739004cf"},"schema_version":"1.0","source":{"id":"1509.06652","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.06652","created_at":"2026-05-18T00:40:14Z"},{"alias_kind":"arxiv_version","alias_value":"1509.06652v2","created_at":"2026-05-18T00:40:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.06652","created_at":"2026-05-18T00:40:14Z"},{"alias_kind":"pith_short_12","alias_value":"LOGDOGQJXTWC","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"LOGDOGQJXTWCWDYJ","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"LOGDOGQJ","created_at":"2026-05-18T12:29:29Z"}],"graph_snapshots":[{"event_id":"sha256:52e57b40a5f1b1709a5304de648c1a31c11b6bca919b80789e21fb8af32f0fb5","target":"graph","created_at":"2026-05-18T00:40:14Z","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"},"paper":{"abstract_excerpt":"A centrosymmetric stress cannot induce a polar response in centric materials, piezoelectricity is, for example, possible only in non-centrosymmetric structures. An exception is meta-materials with shape asymmetry, which may be polarized by stress even when the material is centric. In this case the mechanism is flexoelectricity, which relates polarization to a strain gradient. The flexoelectric response scales inversely with size, thus a large effect is expected in nanoscale materials. Recent experiments in polycrystalline, centrosymmetric perovskites [e.g., (Ba,Sr)TiO3] have indicated values o","authors_text":"Alberto Biancoli, Chris M. Fancher, Dragan Damjanovic, Jacob L. Jones","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-09-22T15:45:59Z","title":"Breaking of macroscopic centric symmetry in paraelectric phases of ferroelectric materials and implications for flexoelectricity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.06652","kind":"arxiv","version":2},"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:c50ff4674288e33df98fd176e8119105fb817162afcd82cbf0326c9350421192","target":"record","created_at":"2026-05-18T00:40:14Z","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":"817a2899226cb02f80439017e5a93c2b785058c05f6d1512612af79009ae7242","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2015-09-22T15:45:59Z","title_canon_sha256":"025b607e8e5d171ae9c4e74ed3ad24b8d5fd672c089836e2eb203796739004cf"},"schema_version":"1.0","source":{"id":"1509.06652","kind":"arxiv","version":2}},"canonical_sha256":"5b8c371a09bcec2b0f096ae7697bac3f168c964a23b4139db68bcaa68398dcd4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5b8c371a09bcec2b0f096ae7697bac3f168c964a23b4139db68bcaa68398dcd4","first_computed_at":"2026-05-18T00:40:14.159420Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:40:14.159420Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CeLPXqwnLPqQVSEfbnCND91S9QJS9tqxGZWIkmPoKiEMi7iOURQqvu0b3/ekL/gd2eB4wJeh3QbUKJz7F1cfDg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:40:14.160088Z","signed_message":"canonical_sha256_bytes"},"source_id":"1509.06652","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c50ff4674288e33df98fd176e8119105fb817162afcd82cbf0326c9350421192","sha256:52e57b40a5f1b1709a5304de648c1a31c11b6bca919b80789e21fb8af32f0fb5"],"state_sha256":"62f8dd7797b0eb3b5eb7ff710f9d6192d43f96d1ea33175dab7e7bfffa6c9e81"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Zo7c5Tj2Banph48AgoIGtN+3hSjBBZvGW9ykM8kiN0LVsHeEMzOfJjkCBJ2l8lFZ0UcAoDlOt0nh6TVpKJIvCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T05:00:35.692222Z","bundle_sha256":"6a40244458cfd19316f05bd35434a4ef6e15f68f44a1475f7eb845a79f67a65a"}}