{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2015:DESVG4PSN5S4J7AGNGQXNJTA7J","short_pith_number":"pith:DESVG4PS","schema_version":"1.0","canonical_sha256":"19255371f26f65c4fc0669a176a660fa58656f29afd2af6b4fee58f0b283fae7","source":{"kind":"arxiv","id":"1505.00228","version":1},"attestation_state":"computed","paper":{"title":"Criticality and Big Brake singularities in the tachyonic evolutions of closed Friedmann universes with cold dark matter","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Alexander Yu. Kamenshchik, L\\'aszl\\'o \\'A. Gergely, Zolt\\'an Keresztes, Zsolt Horv\\'ath","submitted_at":"2015-05-01T17:32:44Z","abstract_excerpt":"The evolution of a closed Friedmann universe filled by a tachyon scalar field with a trigonometric potential and cold dark matter (CDM) is investigated. A subset of the evolutions consistent to 1$\\sigma $ confidence level with the Union 2.1 supernova data set is identified. The evolutions of the tachyon field are classified. Some of them evolve into a de Sitter attractor, while others proceed through a pseudo-tachyonic regime into a sudden future singularity. Critical evolutions leading to Big Brake singularities in the presence of CDM are found and a new type of cosmological evolution charact"},"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":"1505.00228","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2015-05-01T17:32:44Z","cross_cats_sorted":[],"title_canon_sha256":"61e4f149fd6b16461b499cd463e630d03807abae71c9d5d339f390a30af8db44","abstract_canon_sha256":"7f889e0c153515aca6a495151b9e3a4d3241b346262c16bcb5da7cfecd13689c"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:03:59.494574Z","signature_b64":"tz57JuXhH8SRvFAP7s7dJKSVIjuzAkID7t8g4PAML2P6HLUHy2PRwqNBTFHlqsL4Mv6OiDUnLM8l8B/2jApEDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"19255371f26f65c4fc0669a176a660fa58656f29afd2af6b4fee58f0b283fae7","last_reissued_at":"2026-05-18T02:03:59.493828Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:03:59.493828Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Criticality and Big Brake singularities in the tachyonic evolutions of closed Friedmann universes with cold dark matter","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Alexander Yu. Kamenshchik, L\\'aszl\\'o \\'A. Gergely, Zolt\\'an Keresztes, Zsolt Horv\\'ath","submitted_at":"2015-05-01T17:32:44Z","abstract_excerpt":"The evolution of a closed Friedmann universe filled by a tachyon scalar field with a trigonometric potential and cold dark matter (CDM) is investigated. A subset of the evolutions consistent to 1$\\sigma $ confidence level with the Union 2.1 supernova data set is identified. The evolutions of the tachyon field are classified. Some of them evolve into a de Sitter attractor, while others proceed through a pseudo-tachyonic regime into a sudden future singularity. Critical evolutions leading to Big Brake singularities in the presence of CDM are found and a new type of cosmological evolution charact"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.00228","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":"1505.00228","created_at":"2026-05-18T02:03:59.493954+00:00"},{"alias_kind":"arxiv_version","alias_value":"1505.00228v1","created_at":"2026-05-18T02:03:59.493954+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.00228","created_at":"2026-05-18T02:03:59.493954+00:00"},{"alias_kind":"pith_short_12","alias_value":"DESVG4PSN5S4","created_at":"2026-05-18T12:29:17.054201+00:00"},{"alias_kind":"pith_short_16","alias_value":"DESVG4PSN5S4J7AG","created_at":"2026-05-18T12:29:17.054201+00:00"},{"alias_kind":"pith_short_8","alias_value":"DESVG4PS","created_at":"2026-05-18T12:29:17.054201+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/DESVG4PSN5S4J7AGNGQXNJTA7J","json":"https://pith.science/pith/DESVG4PSN5S4J7AGNGQXNJTA7J.json","graph_json":"https://pith.science/api/pith-number/DESVG4PSN5S4J7AGNGQXNJTA7J/graph.json","events_json":"https://pith.science/api/pith-number/DESVG4PSN5S4J7AGNGQXNJTA7J/events.json","paper":"https://pith.science/paper/DESVG4PS"},"agent_actions":{"view_html":"https://pith.science/pith/DESVG4PSN5S4J7AGNGQXNJTA7J","download_json":"https://pith.science/pith/DESVG4PSN5S4J7AGNGQXNJTA7J.json","view_paper":"https://pith.science/paper/DESVG4PS","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1505.00228&json=true","fetch_graph":"https://pith.science/api/pith-number/DESVG4PSN5S4J7AGNGQXNJTA7J/graph.json","fetch_events":"https://pith.science/api/pith-number/DESVG4PSN5S4J7AGNGQXNJTA7J/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/DESVG4PSN5S4J7AGNGQXNJTA7J/action/timestamp_anchor","attest_storage":"https://pith.science/pith/DESVG4PSN5S4J7AGNGQXNJTA7J/action/storage_attestation","attest_author":"https://pith.science/pith/DESVG4PSN5S4J7AGNGQXNJTA7J/action/author_attestation","sign_citation":"https://pith.science/pith/DESVG4PSN5S4J7AGNGQXNJTA7J/action/citation_signature","submit_replication":"https://pith.science/pith/DESVG4PSN5S4J7AGNGQXNJTA7J/action/replication_record"}},"created_at":"2026-05-18T02:03:59.493954+00:00","updated_at":"2026-05-18T02:03:59.493954+00:00"}