{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:N7COPRWFJGKM7RQK3LAKX3DTFO","short_pith_number":"pith:N7COPRWF","canonical_record":{"source":{"id":"1502.01892","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-02-06T14:20:55Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"ac635611f05bbda8d3031af674d5f8b97d39ebbbd61962b372d37bacecf3f2f2","abstract_canon_sha256":"ec281ab449d921a50630ef5969377eadcccccf2429058b708418cc13c02a8657"},"schema_version":"1.0"},"canonical_sha256":"6fc4e7c6c54994cfc60adac0abec732bbb31fb371c60cd204d8434a57a0d95c3","source":{"kind":"arxiv","id":"1502.01892","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.01892","created_at":"2026-05-18T01:29:03Z"},{"alias_kind":"arxiv_version","alias_value":"1502.01892v1","created_at":"2026-05-18T01:29:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.01892","created_at":"2026-05-18T01:29:03Z"},{"alias_kind":"pith_short_12","alias_value":"N7COPRWFJGKM","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_16","alias_value":"N7COPRWFJGKM7RQK","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_8","alias_value":"N7COPRWF","created_at":"2026-05-18T12:29:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:N7COPRWFJGKM7RQK3LAKX3DTFO","target":"record","payload":{"canonical_record":{"source":{"id":"1502.01892","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-02-06T14:20:55Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"ac635611f05bbda8d3031af674d5f8b97d39ebbbd61962b372d37bacecf3f2f2","abstract_canon_sha256":"ec281ab449d921a50630ef5969377eadcccccf2429058b708418cc13c02a8657"},"schema_version":"1.0"},"canonical_sha256":"6fc4e7c6c54994cfc60adac0abec732bbb31fb371c60cd204d8434a57a0d95c3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:29:03.477505Z","signature_b64":"zYOdP3ZuYi6EntaOa1VhHmXPVnSJF/dRcMe5iBm7sv+TFYWD0KDf5pz6MR9/7dgaV6A1Ne3avE/REe8bLJFVDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6fc4e7c6c54994cfc60adac0abec732bbb31fb371c60cd204d8434a57a0d95c3","last_reissued_at":"2026-05-18T01:29:03.476875Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:29:03.476875Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1502.01892","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":"2026-05-18T01:29:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wxeMRDg+aQEbfJHE4LHhwmMu65M+IuimviQ9heYOcKpURx0psmVrvUs7FeozLJaUD1f+nXk8lcDXT23JqnssDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T17:20:05.280242Z"},"content_sha256":"e65ed67e059871e0cd2a4d7ba72b2614a733bc15766e761ff1e22a479129ec37","schema_version":"1.0","event_id":"sha256:e65ed67e059871e0cd2a4d7ba72b2614a733bc15766e761ff1e22a479129ec37"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:N7COPRWFJGKM7RQK3LAKX3DTFO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Breakdown of the semiclassical approximation during the early stages of preheating","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-th"],"primary_cat":"gr-qc","authors_text":"Carmen Molina-Paris, Dillon H. Sanders, Paul R. Anderson","submitted_at":"2015-02-06T14:20:55Z","abstract_excerpt":"The validity of the semiclassical approximation is investigated during the preheating phase in models of chaotic inflation using a modification of a criterion previously proposed for semiclassical gravity. If the modified criterion is violated then fluctuations of the two-point function for the quantum fields are large and the semiclassical approximation is not valid. Evidence is provided that the semiclassical approximation breaks down during the early stages of preheating, well before either scattering effects or backreaction effects are important."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.01892","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":""},"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":"2026-05-18T01:29:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8Vc1pe1DFtKhTLQMfEDYiy5IjNPJVyHuHw0vzncjMb6RXZHARznpiavnDLuD+Doz4G/N21/nnTHeDWVIIgIDDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T17:20:05.280954Z"},"content_sha256":"ad502495a831bf74efae0230bf96dd064df68620037d83f9f6c847a4cc01cbd9","schema_version":"1.0","event_id":"sha256:ad502495a831bf74efae0230bf96dd064df68620037d83f9f6c847a4cc01cbd9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/N7COPRWFJGKM7RQK3LAKX3DTFO/bundle.json","state_url":"https://pith.science/pith/N7COPRWFJGKM7RQK3LAKX3DTFO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/N7COPRWFJGKM7RQK3LAKX3DTFO/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":"2026-05-27T17:20:05Z","links":{"resolver":"https://pith.science/pith/N7COPRWFJGKM7RQK3LAKX3DTFO","bundle":"https://pith.science/pith/N7COPRWFJGKM7RQK3LAKX3DTFO/bundle.json","state":"https://pith.science/pith/N7COPRWFJGKM7RQK3LAKX3DTFO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/N7COPRWFJGKM7RQK3LAKX3DTFO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:N7COPRWFJGKM7RQK3LAKX3DTFO","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":"ec281ab449d921a50630ef5969377eadcccccf2429058b708418cc13c02a8657","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-02-06T14:20:55Z","title_canon_sha256":"ac635611f05bbda8d3031af674d5f8b97d39ebbbd61962b372d37bacecf3f2f2"},"schema_version":"1.0","source":{"id":"1502.01892","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1502.01892","created_at":"2026-05-18T01:29:03Z"},{"alias_kind":"arxiv_version","alias_value":"1502.01892v1","created_at":"2026-05-18T01:29:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1502.01892","created_at":"2026-05-18T01:29:03Z"},{"alias_kind":"pith_short_12","alias_value":"N7COPRWFJGKM","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_16","alias_value":"N7COPRWFJGKM7RQK","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_8","alias_value":"N7COPRWF","created_at":"2026-05-18T12:29:32Z"}],"graph_snapshots":[{"event_id":"sha256:ad502495a831bf74efae0230bf96dd064df68620037d83f9f6c847a4cc01cbd9","target":"graph","created_at":"2026-05-18T01:29:03Z","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":"The validity of the semiclassical approximation is investigated during the preheating phase in models of chaotic inflation using a modification of a criterion previously proposed for semiclassical gravity. If the modified criterion is violated then fluctuations of the two-point function for the quantum fields are large and the semiclassical approximation is not valid. Evidence is provided that the semiclassical approximation breaks down during the early stages of preheating, well before either scattering effects or backreaction effects are important.","authors_text":"Carmen Molina-Paris, Dillon H. Sanders, Paul R. Anderson","cross_cats":["hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-02-06T14:20:55Z","title":"Breakdown of the semiclassical approximation during the early stages of preheating"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1502.01892","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:e65ed67e059871e0cd2a4d7ba72b2614a733bc15766e761ff1e22a479129ec37","target":"record","created_at":"2026-05-18T01:29:03Z","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":"ec281ab449d921a50630ef5969377eadcccccf2429058b708418cc13c02a8657","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-02-06T14:20:55Z","title_canon_sha256":"ac635611f05bbda8d3031af674d5f8b97d39ebbbd61962b372d37bacecf3f2f2"},"schema_version":"1.0","source":{"id":"1502.01892","kind":"arxiv","version":1}},"canonical_sha256":"6fc4e7c6c54994cfc60adac0abec732bbb31fb371c60cd204d8434a57a0d95c3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6fc4e7c6c54994cfc60adac0abec732bbb31fb371c60cd204d8434a57a0d95c3","first_computed_at":"2026-05-18T01:29:03.476875Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:29:03.476875Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zYOdP3ZuYi6EntaOa1VhHmXPVnSJF/dRcMe5iBm7sv+TFYWD0KDf5pz6MR9/7dgaV6A1Ne3avE/REe8bLJFVDg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:29:03.477505Z","signed_message":"canonical_sha256_bytes"},"source_id":"1502.01892","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e65ed67e059871e0cd2a4d7ba72b2614a733bc15766e761ff1e22a479129ec37","sha256:ad502495a831bf74efae0230bf96dd064df68620037d83f9f6c847a4cc01cbd9"],"state_sha256":"a202622ecbcca6d0f81360d0ac682ee815c13d2ac5d3f8dc16a2cff9dde8ee55"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WCURyNABnfLGLtAXu4wEOA098HhDlCKDpUvfLA3mzqc+NGk/25CdtGTTEH7rR/6pdpzy6jDWDnZ7cC5Q2kbJAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T17:20:05.284756Z","bundle_sha256":"d23e3ea8ee41a0c0952a20f47ba0d376410112faf5ac4e56ad113c35cbdb0f13"}}