{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:CNFAS62QHC7XE6BV7ZL2USVQ5L","short_pith_number":"pith:CNFAS62Q","canonical_record":{"source":{"id":"2608.06675","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cond-mat.soft","submitted_at":"2026-08-07T00:44:55Z","cross_cats_sorted":[],"title_canon_sha256":"dd8109d5049dc7ee396a8c447195dfc3aa205b27683736d6904e06668760f084","abstract_canon_sha256":"aacf8a443d56fcc2600b1e3d1ef31d16b34489203c25ff182c119e3b3e1007f3"},"schema_version":"1.0"},"canonical_sha256":"134a097b5038bf727835fe57aa4ab0eafc88b1480e25ac39be2f73f7f8a7c3f3","source":{"kind":"arxiv","id":"2608.06675","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2608.06675","created_at":"2026-08-10T01:11:40Z"},{"alias_kind":"arxiv_version","alias_value":"2608.06675v1","created_at":"2026-08-10T01:11:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.06675","created_at":"2026-08-10T01:11:40Z"},{"alias_kind":"pith_short_12","alias_value":"CNFAS62QHC7X","created_at":"2026-08-10T01:11:40Z"},{"alias_kind":"pith_short_16","alias_value":"CNFAS62QHC7XE6BV","created_at":"2026-08-10T01:11:40Z"},{"alias_kind":"pith_short_8","alias_value":"CNFAS62Q","created_at":"2026-08-10T01:11:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:CNFAS62QHC7XE6BV7ZL2USVQ5L","target":"record","payload":{"canonical_record":{"source":{"id":"2608.06675","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cond-mat.soft","submitted_at":"2026-08-07T00:44:55Z","cross_cats_sorted":[],"title_canon_sha256":"dd8109d5049dc7ee396a8c447195dfc3aa205b27683736d6904e06668760f084","abstract_canon_sha256":"aacf8a443d56fcc2600b1e3d1ef31d16b34489203c25ff182c119e3b3e1007f3"},"schema_version":"1.0"},"canonical_sha256":"134a097b5038bf727835fe57aa4ab0eafc88b1480e25ac39be2f73f7f8a7c3f3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-08-10T01:11:40.587217Z","signature_b64":"GQ0D9j56/QY+VfO54Yi3xJLYj4QOKctyvtA13WYCg5k2gYOyGV6ODxqI+dTW7wMKh7t055A1K2sJ5Zsw99S+DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"134a097b5038bf727835fe57aa4ab0eafc88b1480e25ac39be2f73f7f8a7c3f3","last_reissued_at":"2026-08-10T01:11:40.584763Z","signature_status":"signed_v1","first_computed_at":"2026-08-10T01:11:40.584763Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2608.06675","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":"2026-08-10T01:11:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"W/wfmHy8ozvHhkp9/+lfQjjaASK1u+N/dsqsejKlB/Xj7XNZs0Zu2eoniKFwLacMQitg1gLmjhYw/Nlciu8+CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T10:28:57.488585Z"},"content_sha256":"38f0f085e998b7d60446dbfec303d0c2561906021cf2676e7c99942c4c10c137","schema_version":"1.0","event_id":"sha256:38f0f085e998b7d60446dbfec303d0c2561906021cf2676e7c99942c4c10c137"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:CNFAS62QHC7XE6BV7ZL2USVQ5L","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Non-uniqueness of restitution coefficients in oblique impacts of discs, even in cases of unique normal restitution","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.soft","authors_text":"Dominik Krengel","submitted_at":"2026-08-07T00:44:55Z","abstract_excerpt":"We investigate the different coefficients of restitution $e$ of a dissipative, frictional disc as a function of the impact angle $\\theta$ and the friction coefficient $\\mu$. We observe a non-monotonic, non-linear behaviour of $e_{\\mathrm{T}}$ and $e_{\\mathrm{kin}}$ with a clear minimum at $\\mu$-dependent values of $\\theta$ and a convergence for all $\\mu$ at large $\\theta$, bounded by the cases of pure rolling and pure sliding. Changing the dissipative normal interaction affects the $\\mu$ convergence at large $\\theta$ and leads to a convergence at low $\\theta$. The presence of initial angular v"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.06675","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/2608.06675/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":"2026-08-10T01:11:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GCTvB8Mdn6iDXZdewMxvZwTYUwRckFH9f4syN+0L59STlQ/yoneJdzMG0KfhKDa/gvQPH1agDS/9E14rO2asAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T10:28:57.489590Z"},"content_sha256":"a7226e31d78778b33bfeb6cef32e2eba64e0bcdd33943df3aafcc07593239160","schema_version":"1.0","event_id":"sha256:a7226e31d78778b33bfeb6cef32e2eba64e0bcdd33943df3aafcc07593239160"},{"event_type":"integrity_finding","subject_pith_number":"pith:2026:CNFAS62QHC7XE6BV7ZL2USVQ5L","target":"integrity","payload":{"note":"DOI in the printed bibliography is fragmented by whitespace or line breaks. A longer candidate (10.1007/s10035-026-01639-7) was visible in the surrounding text but could not be confirmed against doi.org as printed.","snippet":"D. Krengel, The inﬂuence of particle shape on planar im- pacts and the correlation between impact angle and par- ticle orientation, Granular Matter 28, 10.1007/s10035- 026-01639-7 (2026)","arxiv_id":"2608.06675","detector":"doi_compliance","evidence":{"ref_index":16,"verdict_class":"incontrovertible","resolved_title":null,"printed_excerpt":"10.1007/s10035-","reconstructed_doi":"10.1007/s10035-026-01639-7"},"severity":"advisory","ref_index":16,"audited_at":"2026-08-10T22:48:09.737266Z","event_type":"pith.integrity.v1","detected_doi":"10.1007/s10035-026-01639-7","detector_url":"https://pith.science/pith-integrity-protocol#doi_compliance","external_url":null,"finding_type":"recoverable_identifier","evidence_hash":"b2eee0c990eb4a4906090f30b9d98b4b349ff923608f29a33291d0edf5a820f4","paper_version":1,"verdict_class":"incontrovertible","resolved_title":null,"detector_version":"1.1.0","detected_arxiv_id":null,"integrity_event_id":18907,"payload_sha256":"9e2844584d9688187f95f4701a58b966153c547287eb118d2ea5fb4edea51f03","signature_b64":"x4PtW1c+YQtNoLFjF1zRq/c8K/fSZIeaMPfxjA8RamuUFndPpAVPBVhnjTgexQw/FsgxMwswMaq/rK8IzSezBw==","signing_key_id":"pith-v1-2026-05"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-08-10T22:48:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kq9rNmj/DT0QLNPQZKfDJDPfpFVRNNuglkdx6+H2Wqrwoqhy8mNaCO/ulHZS/D0DblUUoOHGAWA0iD23VVPSCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T10:28:57.496499Z"},"content_sha256":"a6afa34cba5d45a3caa29884e6844dd3fa218bd6be070e494fdc588ea3f7e952","schema_version":"1.0","event_id":"sha256:a6afa34cba5d45a3caa29884e6844dd3fa218bd6be070e494fdc588ea3f7e952"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CNFAS62QHC7XE6BV7ZL2USVQ5L/bundle.json","state_url":"https://pith.science/pith/CNFAS62QHC7XE6BV7ZL2USVQ5L/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CNFAS62QHC7XE6BV7ZL2USVQ5L/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":"2026-08-13T10:28:57Z","links":{"resolver":"https://pith.science/pith/CNFAS62QHC7XE6BV7ZL2USVQ5L","bundle":"https://pith.science/pith/CNFAS62QHC7XE6BV7ZL2USVQ5L/bundle.json","state":"https://pith.science/pith/CNFAS62QHC7XE6BV7ZL2USVQ5L/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CNFAS62QHC7XE6BV7ZL2USVQ5L/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:CNFAS62QHC7XE6BV7ZL2USVQ5L","merge_version":"pith-open-graph-merge-v1","event_count":3,"valid_event_count":3,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"aacf8a443d56fcc2600b1e3d1ef31d16b34489203c25ff182c119e3b3e1007f3","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cond-mat.soft","submitted_at":"2026-08-07T00:44:55Z","title_canon_sha256":"dd8109d5049dc7ee396a8c447195dfc3aa205b27683736d6904e06668760f084"},"schema_version":"1.0","source":{"id":"2608.06675","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2608.06675","created_at":"2026-08-10T01:11:40Z"},{"alias_kind":"arxiv_version","alias_value":"2608.06675v1","created_at":"2026-08-10T01:11:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.06675","created_at":"2026-08-10T01:11:40Z"},{"alias_kind":"pith_short_12","alias_value":"CNFAS62QHC7X","created_at":"2026-08-10T01:11:40Z"},{"alias_kind":"pith_short_16","alias_value":"CNFAS62QHC7XE6BV","created_at":"2026-08-10T01:11:40Z"},{"alias_kind":"pith_short_8","alias_value":"CNFAS62Q","created_at":"2026-08-10T01:11:40Z"}],"graph_snapshots":[{"event_id":"sha256:a7226e31d78778b33bfeb6cef32e2eba64e0bcdd33943df3aafcc07593239160","target":"graph","created_at":"2026-08-10T01:11:40Z","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/2608.06675/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We investigate the different coefficients of restitution $e$ of a dissipative, frictional disc as a function of the impact angle $\\theta$ and the friction coefficient $\\mu$. We observe a non-monotonic, non-linear behaviour of $e_{\\mathrm{T}}$ and $e_{\\mathrm{kin}}$ with a clear minimum at $\\mu$-dependent values of $\\theta$ and a convergence for all $\\mu$ at large $\\theta$, bounded by the cases of pure rolling and pure sliding. Changing the dissipative normal interaction affects the $\\mu$ convergence at large $\\theta$ and leads to a convergence at low $\\theta$. The presence of initial angular v","authors_text":"Dominik Krengel","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cond-mat.soft","submitted_at":"2026-08-07T00:44:55Z","title":"Non-uniqueness of restitution coefficients in oblique impacts of discs, even in cases of unique normal restitution"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.06675","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":"sha256:38f0f085e998b7d60446dbfec303d0c2561906021cf2676e7c99942c4c10c137","target":"record","created_at":"2026-08-10T01:11:40Z","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":"aacf8a443d56fcc2600b1e3d1ef31d16b34489203c25ff182c119e3b3e1007f3","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"cond-mat.soft","submitted_at":"2026-08-07T00:44:55Z","title_canon_sha256":"dd8109d5049dc7ee396a8c447195dfc3aa205b27683736d6904e06668760f084"},"schema_version":"1.0","source":{"id":"2608.06675","kind":"arxiv","version":1}},"canonical_sha256":"134a097b5038bf727835fe57aa4ab0eafc88b1480e25ac39be2f73f7f8a7c3f3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"134a097b5038bf727835fe57aa4ab0eafc88b1480e25ac39be2f73f7f8a7c3f3","first_computed_at":"2026-08-10T01:11:40.584763Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-08-10T01:11:40.584763Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"GQ0D9j56/QY+VfO54Yi3xJLYj4QOKctyvtA13WYCg5k2gYOyGV6ODxqI+dTW7wMKh7t055A1K2sJ5Zsw99S+DA==","signature_status":"signed_v1","signed_at":"2026-08-10T01:11:40.587217Z","signed_message":"canonical_sha256_bytes"},"source_id":"2608.06675","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:38f0f085e998b7d60446dbfec303d0c2561906021cf2676e7c99942c4c10c137","sha256:a7226e31d78778b33bfeb6cef32e2eba64e0bcdd33943df3aafcc07593239160","sha256:a6afa34cba5d45a3caa29884e6844dd3fa218bd6be070e494fdc588ea3f7e952"],"state_sha256":"ed13edd9077fc8c97b1bf389c61fff0cc69d1d43f25254104edf7d98cc3be72d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"izyij+AUo6IcOq3pmi4q3KEumIHtzNsvLiulvEolMMo057HJMYJ8m7CVPtFU/zeMFO1cv0Y6JbxxJ8BTnS8AAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-13T10:28:57.506001Z","bundle_sha256":"8e32dc8cadd166c7bc554f83757064263658dd4e6a53f2f999fcdd225b7bba88"}}