{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:GIJ477TMCHPIVQJX4LTRT4TN25","short_pith_number":"pith:GIJ477TM","canonical_record":{"source":{"id":"1807.03818","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2018-07-10T18:36:13Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"241d17991c75137ecb83ac599343588856f035be5425435ba35b5cb6bd1bf89a","abstract_canon_sha256":"b54b15359d084877b3170d8154cad1642b5caf1fe5d465ee2e6c8d523bb16e55"},"schema_version":"1.0"},"canonical_sha256":"3213cffe6c11de8ac137e2e719f26dd76d5ac5adc727d7270ee9944110c18227","source":{"kind":"arxiv","id":"1807.03818","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.03818","created_at":"2026-05-17T23:52:15Z"},{"alias_kind":"arxiv_version","alias_value":"1807.03818v2","created_at":"2026-05-17T23:52:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.03818","created_at":"2026-05-17T23:52:15Z"},{"alias_kind":"pith_short_12","alias_value":"GIJ477TMCHPI","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"GIJ477TMCHPIVQJX","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"GIJ477TM","created_at":"2026-05-18T12:32:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:GIJ477TMCHPIVQJX4LTRT4TN25","target":"record","payload":{"canonical_record":{"source":{"id":"1807.03818","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2018-07-10T18:36:13Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"241d17991c75137ecb83ac599343588856f035be5425435ba35b5cb6bd1bf89a","abstract_canon_sha256":"b54b15359d084877b3170d8154cad1642b5caf1fe5d465ee2e6c8d523bb16e55"},"schema_version":"1.0"},"canonical_sha256":"3213cffe6c11de8ac137e2e719f26dd76d5ac5adc727d7270ee9944110c18227","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:52:15.923043Z","signature_b64":"HNHHWVuh6UHVMvR620EnQuTJ+albXOegpYhkdCdJcr93iBPlrPVDBoj9iseinwOjeUQ9oZIbCJ9+QTTOpdOrAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3213cffe6c11de8ac137e2e719f26dd76d5ac5adc727d7270ee9944110c18227","last_reissued_at":"2026-05-17T23:52:15.922203Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:52:15.922203Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1807.03818","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:52:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"j7xBbj6vjWuCY9Bghi+2iyjOnyZw/bIIh34K6sOMCCDA/3pA5LTS88H/fVpJfGPtz+ID3hXse1ZWTitkGZkZBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T18:35:53.329372Z"},"content_sha256":"e593a7025d99dd5ac0e5fbe6abd8d55878dbd07332773f3865fb7870765a7624","schema_version":"1.0","event_id":"sha256:e593a7025d99dd5ac0e5fbe6abd8d55878dbd07332773f3865fb7870765a7624"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:GIJ477TMCHPIVQJX4LTRT4TN25","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A geometrical instability for ultra-light fields during inflation?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"hep-th","authors_text":"Francisco G. Pedro, Gian Paolo Vacca, Michele Cicoli, Veronica Guidetti","submitted_at":"2018-07-10T18:36:13Z","abstract_excerpt":"Westudythebehaviourofisocurvatureperturbationsinnon-linearsigmamodels which naturally emerge in supergravity and string inflationary scenarios. We focus on the case of negatively curved field manifolds which can potentially lead to a geometrical destabilisation of isocurvature modes. We find however that heavy fields are stable when their effective mass is computed on the attractor background solution. On the other hand, we show that ultra-light fields can potentially suffer from a geometrical instability when the background trajectory is a geodesic in field space. In this case a full understa"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.03818","kind":"arxiv","version":2},"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":"2026-05-17T23:52:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"R4oQQu/jSLfjAXpVpVzTXpYEtkLvZf7mubdxhBjtK+FJ23jjumNqKAkVrKFyGK1GqfpO7j77BChxOGUwndD+Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T18:35:53.329717Z"},"content_sha256":"94e6df266d5a268ee44d131557c641148323d4cb90547f168036e25a95ae8878","schema_version":"1.0","event_id":"sha256:94e6df266d5a268ee44d131557c641148323d4cb90547f168036e25a95ae8878"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GIJ477TMCHPIVQJX4LTRT4TN25/bundle.json","state_url":"https://pith.science/pith/GIJ477TMCHPIVQJX4LTRT4TN25/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GIJ477TMCHPIVQJX4LTRT4TN25/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":"2026-06-03T18:35:53Z","links":{"resolver":"https://pith.science/pith/GIJ477TMCHPIVQJX4LTRT4TN25","bundle":"https://pith.science/pith/GIJ477TMCHPIVQJX4LTRT4TN25/bundle.json","state":"https://pith.science/pith/GIJ477TMCHPIVQJX4LTRT4TN25/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GIJ477TMCHPIVQJX4LTRT4TN25/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:GIJ477TMCHPIVQJX4LTRT4TN25","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":"b54b15359d084877b3170d8154cad1642b5caf1fe5d465ee2e6c8d523bb16e55","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2018-07-10T18:36:13Z","title_canon_sha256":"241d17991c75137ecb83ac599343588856f035be5425435ba35b5cb6bd1bf89a"},"schema_version":"1.0","source":{"id":"1807.03818","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.03818","created_at":"2026-05-17T23:52:15Z"},{"alias_kind":"arxiv_version","alias_value":"1807.03818v2","created_at":"2026-05-17T23:52:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.03818","created_at":"2026-05-17T23:52:15Z"},{"alias_kind":"pith_short_12","alias_value":"GIJ477TMCHPI","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"GIJ477TMCHPIVQJX","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"GIJ477TM","created_at":"2026-05-18T12:32:25Z"}],"graph_snapshots":[{"event_id":"sha256:94e6df266d5a268ee44d131557c641148323d4cb90547f168036e25a95ae8878","target":"graph","created_at":"2026-05-17T23:52:15Z","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":"Westudythebehaviourofisocurvatureperturbationsinnon-linearsigmamodels which naturally emerge in supergravity and string inflationary scenarios. We focus on the case of negatively curved field manifolds which can potentially lead to a geometrical destabilisation of isocurvature modes. We find however that heavy fields are stable when their effective mass is computed on the attractor background solution. On the other hand, we show that ultra-light fields can potentially suffer from a geometrical instability when the background trajectory is a geodesic in field space. In this case a full understa","authors_text":"Francisco G. Pedro, Gian Paolo Vacca, Michele Cicoli, Veronica Guidetti","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2018-07-10T18:36:13Z","title":"A geometrical instability for ultra-light fields during inflation?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.03818","kind":"arxiv","version":2},"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:e593a7025d99dd5ac0e5fbe6abd8d55878dbd07332773f3865fb7870765a7624","target":"record","created_at":"2026-05-17T23:52:15Z","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":"b54b15359d084877b3170d8154cad1642b5caf1fe5d465ee2e6c8d523bb16e55","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2018-07-10T18:36:13Z","title_canon_sha256":"241d17991c75137ecb83ac599343588856f035be5425435ba35b5cb6bd1bf89a"},"schema_version":"1.0","source":{"id":"1807.03818","kind":"arxiv","version":2}},"canonical_sha256":"3213cffe6c11de8ac137e2e719f26dd76d5ac5adc727d7270ee9944110c18227","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3213cffe6c11de8ac137e2e719f26dd76d5ac5adc727d7270ee9944110c18227","first_computed_at":"2026-05-17T23:52:15.922203Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:52:15.922203Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HNHHWVuh6UHVMvR620EnQuTJ+albXOegpYhkdCdJcr93iBPlrPVDBoj9iseinwOjeUQ9oZIbCJ9+QTTOpdOrAg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:52:15.923043Z","signed_message":"canonical_sha256_bytes"},"source_id":"1807.03818","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e593a7025d99dd5ac0e5fbe6abd8d55878dbd07332773f3865fb7870765a7624","sha256:94e6df266d5a268ee44d131557c641148323d4cb90547f168036e25a95ae8878"],"state_sha256":"2599fae40153022ab1ce83132b3e50a51c3d3c4d9abfad89444faf6d8a7fa4b0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FZ/dN2zV+qZs52acrsfYhgXOUhFXT7wCFbCKkTsJM73+HbDsn4acbJ/i+vz4jhacj2IO6T3FdcUbKgsYa7WQAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T18:35:53.331752Z","bundle_sha256":"660b4ee75466d1d68f1c2ab4d0f372d2cf084b3e2cb20de837a5088bab404d9c"}}