{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:SXTBOSLFOXVJWLJG3GJ3AML5ZM","short_pith_number":"pith:SXTBOSLF","canonical_record":{"source":{"id":"2601.15261","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2026-01-21T18:41:23Z","cross_cats_sorted":[],"title_canon_sha256":"a3d7d01f8042dc9fb0dee9905e56ed8c6863d2d71edec98a372e283c89ac5f76","abstract_canon_sha256":"673736d324f021cdf69493c3cac37b74f24b697d3da5c1ac77e899db440e905c"},"schema_version":"1.0"},"canonical_sha256":"95e617496575ea9b2d26d993b0317dcb130c4fa990bd252053b414f16bc1b8de","source":{"kind":"arxiv","id":"2601.15261","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2601.15261","created_at":"2026-07-29T01:25:33Z"},{"alias_kind":"arxiv_version","alias_value":"2601.15261v1","created_at":"2026-07-29T01:25:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2601.15261","created_at":"2026-07-29T01:25:33Z"},{"alias_kind":"pith_short_12","alias_value":"SXTBOSLFOXVJ","created_at":"2026-07-29T01:25:33Z"},{"alias_kind":"pith_short_16","alias_value":"SXTBOSLFOXVJWLJG","created_at":"2026-07-29T01:25:33Z"},{"alias_kind":"pith_short_8","alias_value":"SXTBOSLF","created_at":"2026-07-29T01:25:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:SXTBOSLFOXVJWLJG3GJ3AML5ZM","target":"record","payload":{"canonical_record":{"source":{"id":"2601.15261","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2026-01-21T18:41:23Z","cross_cats_sorted":[],"title_canon_sha256":"a3d7d01f8042dc9fb0dee9905e56ed8c6863d2d71edec98a372e283c89ac5f76","abstract_canon_sha256":"673736d324f021cdf69493c3cac37b74f24b697d3da5c1ac77e899db440e905c"},"schema_version":"1.0"},"canonical_sha256":"95e617496575ea9b2d26d993b0317dcb130c4fa990bd252053b414f16bc1b8de","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-29T01:25:33.657189Z","signature_b64":"724HXgEoGxEPNzoysYw2ZOrxYdpPDKkFjqQqZpEeELHFTGFnnYO8ctw51WyyI8e1t2gjBE9Nh0tZ0MNRWxt3BA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"95e617496575ea9b2d26d993b0317dcb130c4fa990bd252053b414f16bc1b8de","last_reissued_at":"2026-07-29T01:25:33.656247Z","signature_status":"signed_v1","first_computed_at":"2026-07-29T01:25:33.656247Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2601.15261","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":"2026-07-29T01:25:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Iq+TvbxjaGUxzgi2eGKKK7NSnuEuu8gdpDBgY7ZNljq1i5UaQluFZnhVKHbNjZ0xR0RTbVTAf6STex3s2NngDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T09:38:58.082368Z"},"content_sha256":"cc764115dbd38fb1cb72a8980f9f9a31926b1c6dc69ea9946b92bba614cc1d68","schema_version":"1.0","event_id":"sha256:cc764115dbd38fb1cb72a8980f9f9a31926b1c6dc69ea9946b92bba614cc1d68"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:SXTBOSLFOXVJWLJG3GJ3AML5ZM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Orbital angular momentum of spatiotemporal vortices: a ray-mechanical analogy","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"Konstantin Y. Bliokh, Miguel A. Alonso, Sophie Vo","submitted_at":"2026-01-21T18:41:23Z","abstract_excerpt":"Spatiotemporal vortex pulses (STVPs) are wavepackets that carry transverse orbital angular momentum (OAM), whose proper quantification has been the subject of recent debate. In this work, we introduce a simplified mechanical model of STVPs, consisting of a loop of non-interacting point particles traveling at a uniform constant speed but at slightly di!erent angles. We examine di!erent initial conditions for the particle loop, including configurations that are elliptic in space at a given time and configurations that are elliptic in spacetime at a fixed propagation distance. Furthermore, employ"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2601.15261","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/2601.15261/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":"2026-07-29T01:25:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"N771f25IUiXg6wMpbZkn18VcVzcpnQMinOEHqUwFZPdDgH/ZZcvIAJbwhiBKsl6+OYnIoUUm8NmZGtGex8L2Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T09:38:58.082869Z"},"content_sha256":"65c7d17c59c1d095c47aa9e4cbd7890ab7762a6c38c60fc06a7e13e5de3bb951","schema_version":"1.0","event_id":"sha256:65c7d17c59c1d095c47aa9e4cbd7890ab7762a6c38c60fc06a7e13e5de3bb951"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SXTBOSLFOXVJWLJG3GJ3AML5ZM/bundle.json","state_url":"https://pith.science/pith/SXTBOSLFOXVJWLJG3GJ3AML5ZM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SXTBOSLFOXVJWLJG3GJ3AML5ZM/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":"2026-08-16T09:38:58Z","links":{"resolver":"https://pith.science/pith/SXTBOSLFOXVJWLJG3GJ3AML5ZM","bundle":"https://pith.science/pith/SXTBOSLFOXVJWLJG3GJ3AML5ZM/bundle.json","state":"https://pith.science/pith/SXTBOSLFOXVJWLJG3GJ3AML5ZM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SXTBOSLFOXVJWLJG3GJ3AML5ZM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:SXTBOSLFOXVJWLJG3GJ3AML5ZM","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":"673736d324f021cdf69493c3cac37b74f24b697d3da5c1ac77e899db440e905c","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2026-01-21T18:41:23Z","title_canon_sha256":"a3d7d01f8042dc9fb0dee9905e56ed8c6863d2d71edec98a372e283c89ac5f76"},"schema_version":"1.0","source":{"id":"2601.15261","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2601.15261","created_at":"2026-07-29T01:25:33Z"},{"alias_kind":"arxiv_version","alias_value":"2601.15261v1","created_at":"2026-07-29T01:25:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2601.15261","created_at":"2026-07-29T01:25:33Z"},{"alias_kind":"pith_short_12","alias_value":"SXTBOSLFOXVJ","created_at":"2026-07-29T01:25:33Z"},{"alias_kind":"pith_short_16","alias_value":"SXTBOSLFOXVJWLJG","created_at":"2026-07-29T01:25:33Z"},{"alias_kind":"pith_short_8","alias_value":"SXTBOSLF","created_at":"2026-07-29T01:25:33Z"}],"graph_snapshots":[{"event_id":"sha256:65c7d17c59c1d095c47aa9e4cbd7890ab7762a6c38c60fc06a7e13e5de3bb951","target":"graph","created_at":"2026-07-29T01:25:33Z","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/2601.15261/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Spatiotemporal vortex pulses (STVPs) are wavepackets that carry transverse orbital angular momentum (OAM), whose proper quantification has been the subject of recent debate. In this work, we introduce a simplified mechanical model of STVPs, consisting of a loop of non-interacting point particles traveling at a uniform constant speed but at slightly di!erent angles. We examine di!erent initial conditions for the particle loop, including configurations that are elliptic in space at a given time and configurations that are elliptic in spacetime at a fixed propagation distance. Furthermore, employ","authors_text":"Konstantin Y. Bliokh, Miguel A. Alonso, Sophie Vo","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2026-01-21T18:41:23Z","title":"Orbital angular momentum of spatiotemporal vortices: a ray-mechanical analogy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2601.15261","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:cc764115dbd38fb1cb72a8980f9f9a31926b1c6dc69ea9946b92bba614cc1d68","target":"record","created_at":"2026-07-29T01:25:33Z","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":"673736d324f021cdf69493c3cac37b74f24b697d3da5c1ac77e899db440e905c","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2026-01-21T18:41:23Z","title_canon_sha256":"a3d7d01f8042dc9fb0dee9905e56ed8c6863d2d71edec98a372e283c89ac5f76"},"schema_version":"1.0","source":{"id":"2601.15261","kind":"arxiv","version":1}},"canonical_sha256":"95e617496575ea9b2d26d993b0317dcb130c4fa990bd252053b414f16bc1b8de","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"95e617496575ea9b2d26d993b0317dcb130c4fa990bd252053b414f16bc1b8de","first_computed_at":"2026-07-29T01:25:33.656247Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-29T01:25:33.656247Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"724HXgEoGxEPNzoysYw2ZOrxYdpPDKkFjqQqZpEeELHFTGFnnYO8ctw51WyyI8e1t2gjBE9Nh0tZ0MNRWxt3BA==","signature_status":"signed_v1","signed_at":"2026-07-29T01:25:33.657189Z","signed_message":"canonical_sha256_bytes"},"source_id":"2601.15261","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cc764115dbd38fb1cb72a8980f9f9a31926b1c6dc69ea9946b92bba614cc1d68","sha256:65c7d17c59c1d095c47aa9e4cbd7890ab7762a6c38c60fc06a7e13e5de3bb951"],"state_sha256":"5601ba257760bcb8dfa79b7eb9abef265ea82d9f01549ff9c69d69ba34ed6ae3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fPx777HwnlEBvjwSKsuJ7C1cMU8DZCL/z0Ncswa1U+s6jTNdxYNmzTxrK+VpDbKRx8I10w3aMKb4wq6od0RNBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T09:38:58.086386Z","bundle_sha256":"c6e7b657caee43d52e6b5d23b42b4c8178cb02224249a0387a800d46c94d03f6"}}