{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:7RVOZQRYCFKB642VVX25V3WWSC","short_pith_number":"pith:7RVOZQRY","canonical_record":{"source":{"id":"1209.2324","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2012-09-11T14:08:05Z","cross_cats_sorted":[],"title_canon_sha256":"0c647f472d189f5a3a573f0ed16977a0fc25ff5c4edf0cd830e83d7479e56dd9","abstract_canon_sha256":"54c347afdc98ed7a778dea2a8ab3adfc237366e21ecdf8a78bc8872284d00493"},"schema_version":"1.0"},"canonical_sha256":"fc6aecc23811541f7355adf5daeed69096aea2c5440a21d21390b28ebc1d2e5b","source":{"kind":"arxiv","id":"1209.2324","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.2324","created_at":"2026-05-18T03:45:52Z"},{"alias_kind":"arxiv_version","alias_value":"1209.2324v1","created_at":"2026-05-18T03:45:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.2324","created_at":"2026-05-18T03:45:52Z"},{"alias_kind":"pith_short_12","alias_value":"7RVOZQRYCFKB","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_16","alias_value":"7RVOZQRYCFKB642V","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_8","alias_value":"7RVOZQRY","created_at":"2026-05-18T12:26:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:7RVOZQRYCFKB642VVX25V3WWSC","target":"record","payload":{"canonical_record":{"source":{"id":"1209.2324","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2012-09-11T14:08:05Z","cross_cats_sorted":[],"title_canon_sha256":"0c647f472d189f5a3a573f0ed16977a0fc25ff5c4edf0cd830e83d7479e56dd9","abstract_canon_sha256":"54c347afdc98ed7a778dea2a8ab3adfc237366e21ecdf8a78bc8872284d00493"},"schema_version":"1.0"},"canonical_sha256":"fc6aecc23811541f7355adf5daeed69096aea2c5440a21d21390b28ebc1d2e5b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:45:52.201711Z","signature_b64":"G3dvDBiURudVOQwRylzEUZBeZG2XlCn5S+meBx/VWpXJjOwk27y/EXyWmfsmWMZlLJhDv844bBT7Pp6y5CLnCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fc6aecc23811541f7355adf5daeed69096aea2c5440a21d21390b28ebc1d2e5b","last_reissued_at":"2026-05-18T03:45:52.200912Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:45:52.200912Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1209.2324","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":"2026-05-18T03:45:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"P6e5BKwZ76OyMjjZ77gqU0HrlJsU9mxOswNLrpqj5ZUafXOEvquWXlFEnE/AruoIEaKRPOxzMy9U+plUxd85AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T16:23:39.693073Z"},"content_sha256":"81bc3d4d0c049a98330465528d9191ad0191069612b9fe60c9643d561ec8f9ce","schema_version":"1.0","event_id":"sha256:81bc3d4d0c049a98330465528d9191ad0191069612b9fe60c9643d561ec8f9ce"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:7RVOZQRYCFKB642VVX25V3WWSC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Phonons in Slow Motion: Dispersion Relations in Ultra-Thin Si Membranes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mes-hall","authors_text":"Andrey Shchepetov, Bahram Djafari-Rouhani, Clivia. M. Sotomayor Torres, Damian Dudek, El Houssaine El Boudoutie, Emigdio Chavez, Francesc Alzina, John Cuffe, Jordi Gomis-Bresco, Jouni Ahopelto, Mika Prunnila, P-Olivier Chapuis, Timothy Kehoe, Yan Pennec","submitted_at":"2012-09-11T14:08:05Z","abstract_excerpt":"We report the changes in dispersion relations of hypersonic acoustic phonons in free-standing silicon membranes as thin as \\sim 8 nm. We observe a reduction of the phase and group velocities of the fundamental flexural mode by more than one order of magnitude compared to bulk values. The modification of the dispersion relation in nanostructures has important consequences for noise control in nano and micro-electromechanical systems (MEMS/NEMS) as well as opto-mechanical devices."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.2324","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":""},"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":"2026-05-18T03:45:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gYO9qwKiLhwmOh4U9YELTEq7CG3M2A4Qli1qoJDfQDDB4N2kCZz2mnIZEP6ySoi88r14TjMlBzdlW2FIA5LZCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T16:23:39.693442Z"},"content_sha256":"160476d2ac39e2611ee0b75ee0c31909957b59daaacf4ec1ef605ef185618bbf","schema_version":"1.0","event_id":"sha256:160476d2ac39e2611ee0b75ee0c31909957b59daaacf4ec1ef605ef185618bbf"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7RVOZQRYCFKB642VVX25V3WWSC/bundle.json","state_url":"https://pith.science/pith/7RVOZQRYCFKB642VVX25V3WWSC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7RVOZQRYCFKB642VVX25V3WWSC/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":"2026-05-19T16:23:39Z","links":{"resolver":"https://pith.science/pith/7RVOZQRYCFKB642VVX25V3WWSC","bundle":"https://pith.science/pith/7RVOZQRYCFKB642VVX25V3WWSC/bundle.json","state":"https://pith.science/pith/7RVOZQRYCFKB642VVX25V3WWSC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7RVOZQRYCFKB642VVX25V3WWSC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:7RVOZQRYCFKB642VVX25V3WWSC","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":"54c347afdc98ed7a778dea2a8ab3adfc237366e21ecdf8a78bc8872284d00493","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2012-09-11T14:08:05Z","title_canon_sha256":"0c647f472d189f5a3a573f0ed16977a0fc25ff5c4edf0cd830e83d7479e56dd9"},"schema_version":"1.0","source":{"id":"1209.2324","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.2324","created_at":"2026-05-18T03:45:52Z"},{"alias_kind":"arxiv_version","alias_value":"1209.2324v1","created_at":"2026-05-18T03:45:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.2324","created_at":"2026-05-18T03:45:52Z"},{"alias_kind":"pith_short_12","alias_value":"7RVOZQRYCFKB","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_16","alias_value":"7RVOZQRYCFKB642V","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_8","alias_value":"7RVOZQRY","created_at":"2026-05-18T12:26:58Z"}],"graph_snapshots":[{"event_id":"sha256:160476d2ac39e2611ee0b75ee0c31909957b59daaacf4ec1ef605ef185618bbf","target":"graph","created_at":"2026-05-18T03:45:52Z","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":"We report the changes in dispersion relations of hypersonic acoustic phonons in free-standing silicon membranes as thin as \\sim 8 nm. We observe a reduction of the phase and group velocities of the fundamental flexural mode by more than one order of magnitude compared to bulk values. The modification of the dispersion relation in nanostructures has important consequences for noise control in nano and micro-electromechanical systems (MEMS/NEMS) as well as opto-mechanical devices.","authors_text":"Andrey Shchepetov, Bahram Djafari-Rouhani, Clivia. M. Sotomayor Torres, Damian Dudek, El Houssaine El Boudoutie, Emigdio Chavez, Francesc Alzina, John Cuffe, Jordi Gomis-Bresco, Jouni Ahopelto, Mika Prunnila, P-Olivier Chapuis, Timothy Kehoe, Yan Pennec","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2012-09-11T14:08:05Z","title":"Phonons in Slow Motion: Dispersion Relations in Ultra-Thin Si Membranes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.2324","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":"sha256:81bc3d4d0c049a98330465528d9191ad0191069612b9fe60c9643d561ec8f9ce","target":"record","created_at":"2026-05-18T03:45:52Z","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":"54c347afdc98ed7a778dea2a8ab3adfc237366e21ecdf8a78bc8872284d00493","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mes-hall","submitted_at":"2012-09-11T14:08:05Z","title_canon_sha256":"0c647f472d189f5a3a573f0ed16977a0fc25ff5c4edf0cd830e83d7479e56dd9"},"schema_version":"1.0","source":{"id":"1209.2324","kind":"arxiv","version":1}},"canonical_sha256":"fc6aecc23811541f7355adf5daeed69096aea2c5440a21d21390b28ebc1d2e5b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fc6aecc23811541f7355adf5daeed69096aea2c5440a21d21390b28ebc1d2e5b","first_computed_at":"2026-05-18T03:45:52.200912Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:45:52.200912Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"G3dvDBiURudVOQwRylzEUZBeZG2XlCn5S+meBx/VWpXJjOwk27y/EXyWmfsmWMZlLJhDv844bBT7Pp6y5CLnCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:45:52.201711Z","signed_message":"canonical_sha256_bytes"},"source_id":"1209.2324","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:81bc3d4d0c049a98330465528d9191ad0191069612b9fe60c9643d561ec8f9ce","sha256:160476d2ac39e2611ee0b75ee0c31909957b59daaacf4ec1ef605ef185618bbf"],"state_sha256":"856ca4e948099bbd4feac4964023e59bd6d9cadd554d329d08c337c9d7f95fd2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"un8tsWKAqTeRzlSQM0iHulhEiO4mlvRElfX94myNGZiPH29pToyO1pKn7jDsV8c70bWSY/ynjoqgLZxJbGA8Cg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-19T16:23:39.695396Z","bundle_sha256":"eff48ca2ae63e2c4674d2d0fff752ced7645e4423393b6b2c84a5a765136ab57"}}