{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2004:NWVW2CB3P23HOGYK4T2CUWF6VH","short_pith_number":"pith:NWVW2CB3","schema_version":"1.0","canonical_sha256":"6dab6d083b7eb6771b0ae4f42a58bea9e6b304a7b75c4acf3f66aea668648fa0","source":{"kind":"arxiv","id":"hep-th/0408083","version":1},"attestation_state":"computed","paper":{"title":"M Theory Model of a Big Crunch/Big Bang Transition","license":"","headline":"","cross_cats":["astro-ph","gr-qc"],"primary_cat":"hep-th","authors_text":"Malcolm Perry, Neil Turok, Paul J. Steinhardt","submitted_at":"2004-08-10T20:51:21Z","abstract_excerpt":"We consider a picture in which the transition from a big crunch to a big bang corresponds to the collision of two empty orbifold planes approaching each other at a constant non-relativistic speed in a locally flat background space-time, a situation relevant to recently proposed cosmological models. We show that $p$-brane states which wind around the extra dimension propagate smoothly and unambiguously across the orbifold plane collision. In particular we calculate the quantum mechanical production of winding M2-branes extending from one orbifold to the other. We find that the resulting density"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"hep-th/0408083","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-th","submitted_at":"2004-08-10T20:51:21Z","cross_cats_sorted":["astro-ph","gr-qc"],"title_canon_sha256":"4c76e2a2c180f793efb5b27b660020cd80b3ce51c3d6cad1c936c5693eeb472f","abstract_canon_sha256":"cf47af0e51f11e0bd9fc426bf8fb11686cabe2d3c661355a115e1ab6814504a1"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:35:39.626171Z","signature_b64":"NGgHdO9xvrhNdop3lJKwKXnZlGTQQ7HhC7qa1GNcZZSdVu1UaglAtBqo6xaZuYuMD1Oi8Czi3kfyKu54ooI8DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6dab6d083b7eb6771b0ae4f42a58bea9e6b304a7b75c4acf3f66aea668648fa0","last_reissued_at":"2026-05-18T02:35:39.625749Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:35:39.625749Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"M Theory Model of a Big Crunch/Big Bang Transition","license":"","headline":"","cross_cats":["astro-ph","gr-qc"],"primary_cat":"hep-th","authors_text":"Malcolm Perry, Neil Turok, Paul J. Steinhardt","submitted_at":"2004-08-10T20:51:21Z","abstract_excerpt":"We consider a picture in which the transition from a big crunch to a big bang corresponds to the collision of two empty orbifold planes approaching each other at a constant non-relativistic speed in a locally flat background space-time, a situation relevant to recently proposed cosmological models. We show that $p$-brane states which wind around the extra dimension propagate smoothly and unambiguously across the orbifold plane collision. In particular we calculate the quantum mechanical production of winding M2-branes extending from one orbifold to the other. We find that the resulting density"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-th/0408083","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"hep-th/0408083","created_at":"2026-05-18T02:35:39.625798+00:00"},{"alias_kind":"arxiv_version","alias_value":"hep-th/0408083v1","created_at":"2026-05-18T02:35:39.625798+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-th/0408083","created_at":"2026-05-18T02:35:39.625798+00:00"},{"alias_kind":"pith_short_12","alias_value":"NWVW2CB3P23H","created_at":"2026-05-18T12:25:52.687210+00:00"},{"alias_kind":"pith_short_16","alias_value":"NWVW2CB3P23HOGYK","created_at":"2026-05-18T12:25:52.687210+00:00"},{"alias_kind":"pith_short_8","alias_value":"NWVW2CB3","created_at":"2026-05-18T12:25:52.687210+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/NWVW2CB3P23HOGYK4T2CUWF6VH","json":"https://pith.science/pith/NWVW2CB3P23HOGYK4T2CUWF6VH.json","graph_json":"https://pith.science/api/pith-number/NWVW2CB3P23HOGYK4T2CUWF6VH/graph.json","events_json":"https://pith.science/api/pith-number/NWVW2CB3P23HOGYK4T2CUWF6VH/events.json","paper":"https://pith.science/paper/NWVW2CB3"},"agent_actions":{"view_html":"https://pith.science/pith/NWVW2CB3P23HOGYK4T2CUWF6VH","download_json":"https://pith.science/pith/NWVW2CB3P23HOGYK4T2CUWF6VH.json","view_paper":"https://pith.science/paper/NWVW2CB3","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=hep-th/0408083&json=true","fetch_graph":"https://pith.science/api/pith-number/NWVW2CB3P23HOGYK4T2CUWF6VH/graph.json","fetch_events":"https://pith.science/api/pith-number/NWVW2CB3P23HOGYK4T2CUWF6VH/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/NWVW2CB3P23HOGYK4T2CUWF6VH/action/timestamp_anchor","attest_storage":"https://pith.science/pith/NWVW2CB3P23HOGYK4T2CUWF6VH/action/storage_attestation","attest_author":"https://pith.science/pith/NWVW2CB3P23HOGYK4T2CUWF6VH/action/author_attestation","sign_citation":"https://pith.science/pith/NWVW2CB3P23HOGYK4T2CUWF6VH/action/citation_signature","submit_replication":"https://pith.science/pith/NWVW2CB3P23HOGYK4T2CUWF6VH/action/replication_record"}},"created_at":"2026-05-18T02:35:39.625798+00:00","updated_at":"2026-05-18T02:35:39.625798+00:00"}