{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:BR6BHKMNZFRGC66AJ47ADZBZSH","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":"8544bc8c23b469dfe61c0e5bdc6ffcf328a83451d4e5db02b90e7795275c747c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2018-10-20T02:31:19Z","title_canon_sha256":"4cbd5304bc17af05d678889b79bfa18574e03fab17fa774b29993c86d67f891a"},"schema_version":"1.0","source":{"id":"1811.04130","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.04130","created_at":"2026-05-17T23:47:19Z"},{"alias_kind":"arxiv_version","alias_value":"1811.04130v1","created_at":"2026-05-17T23:47:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.04130","created_at":"2026-05-17T23:47:19Z"},{"alias_kind":"pith_short_12","alias_value":"BR6BHKMNZFRG","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_16","alias_value":"BR6BHKMNZFRGC66A","created_at":"2026-05-18T12:32:16Z"},{"alias_kind":"pith_short_8","alias_value":"BR6BHKMN","created_at":"2026-05-18T12:32:16Z"}],"graph_snapshots":[{"event_id":"sha256:726e424f49e5f3358ce61a648a927bf59f3e4519774e6e9a0b9870a22dab1f27","target":"graph","created_at":"2026-05-17T23:47:19Z","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":"Realization of non-reciprocal devices, such as isolators and circulators, is of fundamental importance in microwave and photonic communication systems. This can be achieved by breaking time-reversal symmetry in the system or exploiting nonlinearity and topological effects. However, exploration of non-reciprocal devices remains scarce in acoustic systems. In this work, sound propagation in a space-time modulated medium is theoretically studied. Finite-difference time-domain (FDTD) simulations are carried out to verify the results. Functionalities such as mode conversion, parametric amplificatio","authors_text":"Chen Shen, Junfei Li, Steven A. Cummer, Yangbo Xie","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2018-10-20T02:31:19Z","title":"Non-reciprocal sound propagation in space-time modulated media"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.04130","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:b03cb04a8245dc01b4281367567e329c1613c68d508c7253518fa63c57459934","target":"record","created_at":"2026-05-17T23:47:19Z","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":"8544bc8c23b469dfe61c0e5bdc6ffcf328a83451d4e5db02b90e7795275c747c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.app-ph","submitted_at":"2018-10-20T02:31:19Z","title_canon_sha256":"4cbd5304bc17af05d678889b79bfa18574e03fab17fa774b29993c86d67f891a"},"schema_version":"1.0","source":{"id":"1811.04130","kind":"arxiv","version":1}},"canonical_sha256":"0c7c13a98dc962617bc04f3e01e43991c9a2438aa436d37ee18f06d7cdb8a5ef","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0c7c13a98dc962617bc04f3e01e43991c9a2438aa436d37ee18f06d7cdb8a5ef","first_computed_at":"2026-05-17T23:47:19.995950Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:47:19.995950Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5JZRp+ydXPZgQx9Qz0TMINM/sP0WqG4aYBRFnt45iDd26j52+eiok8LdUDHCjGrsJoPg0M6/7qDjA3KkU2OIBQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:47:19.996570Z","signed_message":"canonical_sha256_bytes"},"source_id":"1811.04130","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b03cb04a8245dc01b4281367567e329c1613c68d508c7253518fa63c57459934","sha256:726e424f49e5f3358ce61a648a927bf59f3e4519774e6e9a0b9870a22dab1f27"],"state_sha256":"d0b4e2122ab4cf84d21a70e8f04e58c8b6270fc971504dca9716a35677c6ec21"}