{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2021:LGAIMLHZYDGI25ADBEI7VFKQD4","short_pith_number":"pith:LGAIMLHZ","schema_version":"1.0","canonical_sha256":"5980862cf9c0cc8d74030911fa95501f26abe825f6e8fe3a3ebc2ac4500f176c","source":{"kind":"arxiv","id":"2108.12553","version":1},"attestation_state":"computed","paper":{"title":"Quantum gravity might restrict a cyclic evolution","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","hep-th"],"primary_cat":"gr-qc","authors_text":"Bao-Fei Li, Parampreet Singh","submitted_at":"2021-08-28T02:31:58Z","abstract_excerpt":"It is generally expected that in a non-singular cosmological model a cyclic evolution is straightforward to obtain on introduction of a suitable choice of a scalar field with a negative potential or a negative cosmological constant which causes a recollapse at some time in the evolution. We present a counter example to this conventional wisdom. Working in the realm of loop cosmological models with non-perturbative quantum gravity modifications we show that a modified version of standard loop quantum cosmology based on Thiemann's regularization of the Hamiltonian constraint while generically no"},"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":"2108.12553","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-08-28T02:31:58Z","cross_cats_sorted":["astro-ph.CO","hep-th"],"title_canon_sha256":"deefa104f3c3dff03293e130599424277660c6726bafcc5e0bae764e9bb71db9","abstract_canon_sha256":"51c49cda27b511e865b207ebb72cc642a3e47f70461a29077a3c11980fb17976"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:04:20.338647Z","signature_b64":"vI1AmBjg6FTeedP/E4mjSEhJD+KF4qGurYXbrybPC2XckPkirlGTADuGxnVCAU77fbixCd2fpOwNHhv/DYkdAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5980862cf9c0cc8d74030911fa95501f26abe825f6e8fe3a3ebc2ac4500f176c","last_reissued_at":"2026-07-05T04:04:20.338238Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:04:20.338238Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Quantum gravity might restrict a cyclic evolution","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","hep-th"],"primary_cat":"gr-qc","authors_text":"Bao-Fei Li, Parampreet Singh","submitted_at":"2021-08-28T02:31:58Z","abstract_excerpt":"It is generally expected that in a non-singular cosmological model a cyclic evolution is straightforward to obtain on introduction of a suitable choice of a scalar field with a negative potential or a negative cosmological constant which causes a recollapse at some time in the evolution. We present a counter example to this conventional wisdom. Working in the realm of loop cosmological models with non-perturbative quantum gravity modifications we show that a modified version of standard loop quantum cosmology based on Thiemann's regularization of the Hamiltonian constraint while generically no"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.12553","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/2108.12553/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2108.12553","created_at":"2026-07-05T04:04:20.338295+00:00"},{"alias_kind":"arxiv_version","alias_value":"2108.12553v1","created_at":"2026-07-05T04:04:20.338295+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.12553","created_at":"2026-07-05T04:04:20.338295+00:00"},{"alias_kind":"pith_short_12","alias_value":"LGAIMLHZYDGI","created_at":"2026-07-05T04:04:20.338295+00:00"},{"alias_kind":"pith_short_16","alias_value":"LGAIMLHZYDGI25AD","created_at":"2026-07-05T04:04:20.338295+00:00"},{"alias_kind":"pith_short_8","alias_value":"LGAIMLHZ","created_at":"2026-07-05T04:04:20.338295+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2502.09718","citing_title":"Lessons from gauge fixing and polymerization of loop quantum black holes with a cosmological constant","ref_index":13,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/LGAIMLHZYDGI25ADBEI7VFKQD4","json":"https://pith.science/pith/LGAIMLHZYDGI25ADBEI7VFKQD4.json","graph_json":"https://pith.science/api/pith-number/LGAIMLHZYDGI25ADBEI7VFKQD4/graph.json","events_json":"https://pith.science/api/pith-number/LGAIMLHZYDGI25ADBEI7VFKQD4/events.json","paper":"https://pith.science/paper/LGAIMLHZ"},"agent_actions":{"view_html":"https://pith.science/pith/LGAIMLHZYDGI25ADBEI7VFKQD4","download_json":"https://pith.science/pith/LGAIMLHZYDGI25ADBEI7VFKQD4.json","view_paper":"https://pith.science/paper/LGAIMLHZ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2108.12553&json=true","fetch_graph":"https://pith.science/api/pith-number/LGAIMLHZYDGI25ADBEI7VFKQD4/graph.json","fetch_events":"https://pith.science/api/pith-number/LGAIMLHZYDGI25ADBEI7VFKQD4/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/LGAIMLHZYDGI25ADBEI7VFKQD4/action/timestamp_anchor","attest_storage":"https://pith.science/pith/LGAIMLHZYDGI25ADBEI7VFKQD4/action/storage_attestation","attest_author":"https://pith.science/pith/LGAIMLHZYDGI25ADBEI7VFKQD4/action/author_attestation","sign_citation":"https://pith.science/pith/LGAIMLHZYDGI25ADBEI7VFKQD4/action/citation_signature","submit_replication":"https://pith.science/pith/LGAIMLHZYDGI25ADBEI7VFKQD4/action/replication_record"}},"created_at":"2026-07-05T04:04:20.338295+00:00","updated_at":"2026-07-05T04:04:20.338295+00:00"}