{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:JLYCZKM7ZWCHTQ4IVTL4FR2WLH","short_pith_number":"pith:JLYCZKM7","canonical_record":{"source":{"id":"1912.05201","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2019-12-11T09:39:59Z","cross_cats_sorted":["physics.flu-dyn"],"title_canon_sha256":"4d821e99d5edf938527365bfb0bcac4a9ff625bc6533ffb6744a9804a12f374c","abstract_canon_sha256":"4bb0604d6dba8db478494bc276042a0ecaebfd9b922ae57854bd7dd37da3ac01"},"schema_version":"1.0"},"canonical_sha256":"4af02ca99fcd8479c388acd7c2c75659cb440cb56a15b52b1f8df2a051df95c5","source":{"kind":"arxiv","id":"1912.05201","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1912.05201","created_at":"2026-07-05T00:48:51Z"},{"alias_kind":"arxiv_version","alias_value":"1912.05201v1","created_at":"2026-07-05T00:48:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1912.05201","created_at":"2026-07-05T00:48:51Z"},{"alias_kind":"pith_short_12","alias_value":"JLYCZKM7ZWCH","created_at":"2026-07-05T00:48:51Z"},{"alias_kind":"pith_short_16","alias_value":"JLYCZKM7ZWCHTQ4I","created_at":"2026-07-05T00:48:51Z"},{"alias_kind":"pith_short_8","alias_value":"JLYCZKM7","created_at":"2026-07-05T00:48:51Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:JLYCZKM7ZWCHTQ4IVTL4FR2WLH","target":"record","payload":{"canonical_record":{"source":{"id":"1912.05201","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2019-12-11T09:39:59Z","cross_cats_sorted":["physics.flu-dyn"],"title_canon_sha256":"4d821e99d5edf938527365bfb0bcac4a9ff625bc6533ffb6744a9804a12f374c","abstract_canon_sha256":"4bb0604d6dba8db478494bc276042a0ecaebfd9b922ae57854bd7dd37da3ac01"},"schema_version":"1.0"},"canonical_sha256":"4af02ca99fcd8479c388acd7c2c75659cb440cb56a15b52b1f8df2a051df95c5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:48:51.404680Z","signature_b64":"Ka+wFrL9FHf9Lr3Vs7v08Hl+9PitQmURlqilqW3cf1m0CGf3GFIMjCp10Y9/hslvcwCuJ18GI+IMcaNx3GXRBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4af02ca99fcd8479c388acd7c2c75659cb440cb56a15b52b1f8df2a051df95c5","last_reissued_at":"2026-07-05T00:48:51.404144Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:48:51.404144Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1912.05201","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":"2026-07-05T00:48:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nGkS3lEJycSOyV13y1ivrK2Ug16BcV+OnDI/O56ERNz0EGaoU/PcyZRJOnDR8carB4exJXs7Qn/fKPzxTy9XCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T18:02:57.197482Z"},"content_sha256":"e88774fde93a588f9e77ac24c9308e9d653bd9c95435cce08da34e6e41f455b1","schema_version":"1.0","event_id":"sha256:e88774fde93a588f9e77ac24c9308e9d653bd9c95435cce08da34e6e41f455b1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:JLYCZKM7ZWCHTQ4IVTL4FR2WLH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Activity induced nematic order in isotropic liquid crystals","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.flu-dyn"],"primary_cat":"cond-mat.soft","authors_text":"Amin Doostmohammadi, Julia M. Yeomans, Mehrana R. Nejad, Sreejith Santhosh, Sumesh P. Thampi","submitted_at":"2019-12-11T09:39:59Z","abstract_excerpt":"We use linear stability analysis to show that an isotropic phase of elongated particles with dipolar flow fields can develop nematic order as a result of their activity. We argue that ordering is favoured if the particles are flow-aligning and is strongest if the wavevector of the order perturbation is neither parallel nor perpendicular to the nematic director. Numerical solutions of the hydrodynamic equations of motion of an active nematic confirm the results. The instability is contrasted to the well-known hydrodynamic instability of an ordered active nematic."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1912.05201","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/1912.05201/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":"2026-07-05T00:48:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/8mk/6zKvdPA2Lk5lAkOQr+7hYOPOG54HH5A+yrTpaBhJqi3HqZUGSyv053ciejNH7m1/mLSBwJdkQ9AvofSAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-09T18:02:57.198014Z"},"content_sha256":"66db99e596f196308d2c81c6195bfc74f06f948f435238c99a0fc9e367747a75","schema_version":"1.0","event_id":"sha256:66db99e596f196308d2c81c6195bfc74f06f948f435238c99a0fc9e367747a75"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JLYCZKM7ZWCHTQ4IVTL4FR2WLH/bundle.json","state_url":"https://pith.science/pith/JLYCZKM7ZWCHTQ4IVTL4FR2WLH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JLYCZKM7ZWCHTQ4IVTL4FR2WLH/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":"2026-08-09T18:02:57Z","links":{"resolver":"https://pith.science/pith/JLYCZKM7ZWCHTQ4IVTL4FR2WLH","bundle":"https://pith.science/pith/JLYCZKM7ZWCHTQ4IVTL4FR2WLH/bundle.json","state":"https://pith.science/pith/JLYCZKM7ZWCHTQ4IVTL4FR2WLH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JLYCZKM7ZWCHTQ4IVTL4FR2WLH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:JLYCZKM7ZWCHTQ4IVTL4FR2WLH","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":"4bb0604d6dba8db478494bc276042a0ecaebfd9b922ae57854bd7dd37da3ac01","cross_cats_sorted":["physics.flu-dyn"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2019-12-11T09:39:59Z","title_canon_sha256":"4d821e99d5edf938527365bfb0bcac4a9ff625bc6533ffb6744a9804a12f374c"},"schema_version":"1.0","source":{"id":"1912.05201","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1912.05201","created_at":"2026-07-05T00:48:51Z"},{"alias_kind":"arxiv_version","alias_value":"1912.05201v1","created_at":"2026-07-05T00:48:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1912.05201","created_at":"2026-07-05T00:48:51Z"},{"alias_kind":"pith_short_12","alias_value":"JLYCZKM7ZWCH","created_at":"2026-07-05T00:48:51Z"},{"alias_kind":"pith_short_16","alias_value":"JLYCZKM7ZWCHTQ4I","created_at":"2026-07-05T00:48:51Z"},{"alias_kind":"pith_short_8","alias_value":"JLYCZKM7","created_at":"2026-07-05T00:48:51Z"}],"graph_snapshots":[{"event_id":"sha256:66db99e596f196308d2c81c6195bfc74f06f948f435238c99a0fc9e367747a75","target":"graph","created_at":"2026-07-05T00:48:51Z","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/1912.05201/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We use linear stability analysis to show that an isotropic phase of elongated particles with dipolar flow fields can develop nematic order as a result of their activity. We argue that ordering is favoured if the particles are flow-aligning and is strongest if the wavevector of the order perturbation is neither parallel nor perpendicular to the nematic director. Numerical solutions of the hydrodynamic equations of motion of an active nematic confirm the results. The instability is contrasted to the well-known hydrodynamic instability of an ordered active nematic.","authors_text":"Amin Doostmohammadi, Julia M. Yeomans, Mehrana R. Nejad, Sreejith Santhosh, Sumesh P. Thampi","cross_cats":["physics.flu-dyn"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2019-12-11T09:39:59Z","title":"Activity induced nematic order in isotropic liquid crystals"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1912.05201","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:e88774fde93a588f9e77ac24c9308e9d653bd9c95435cce08da34e6e41f455b1","target":"record","created_at":"2026-07-05T00:48:51Z","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":"4bb0604d6dba8db478494bc276042a0ecaebfd9b922ae57854bd7dd37da3ac01","cross_cats_sorted":["physics.flu-dyn"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2019-12-11T09:39:59Z","title_canon_sha256":"4d821e99d5edf938527365bfb0bcac4a9ff625bc6533ffb6744a9804a12f374c"},"schema_version":"1.0","source":{"id":"1912.05201","kind":"arxiv","version":1}},"canonical_sha256":"4af02ca99fcd8479c388acd7c2c75659cb440cb56a15b52b1f8df2a051df95c5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4af02ca99fcd8479c388acd7c2c75659cb440cb56a15b52b1f8df2a051df95c5","first_computed_at":"2026-07-05T00:48:51.404144Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:48:51.404144Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Ka+wFrL9FHf9Lr3Vs7v08Hl+9PitQmURlqilqW3cf1m0CGf3GFIMjCp10Y9/hslvcwCuJ18GI+IMcaNx3GXRBg==","signature_status":"signed_v1","signed_at":"2026-07-05T00:48:51.404680Z","signed_message":"canonical_sha256_bytes"},"source_id":"1912.05201","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e88774fde93a588f9e77ac24c9308e9d653bd9c95435cce08da34e6e41f455b1","sha256:66db99e596f196308d2c81c6195bfc74f06f948f435238c99a0fc9e367747a75"],"state_sha256":"33bf38f2120b3baeeaf0f9d7ed5c7d88d9497177b71e624adbd53440cb67a904"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wznvOmQmnqpKiQb2hJLdM3RwvLlO+uFUUa53JulL2+8dNwJ7ByKY9iXZe/iY6t6OxUiM5O9dbpFSnh5E6IqAAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-09T18:02:57.203462Z","bundle_sha256":"8762d962348fbde58528f43d6a5fda1767810e820e1e0779dee0c3555b18f6f3"}}