{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:T53KARIKLW4QX2GSIAFAK5Z6UY","short_pith_number":"pith:T53KARIK","canonical_record":{"source":{"id":"2108.07101","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-08-16T14:12:36Z","cross_cats_sorted":["astro-ph.CO","hep-th"],"title_canon_sha256":"d7e5f4de039b8c92bd70d0d6bd0da932dc9164eaf1e683662989222086f65625","abstract_canon_sha256":"526f0bbfb3a24c8ea4294fd7a54a7cf482f0046864f09eab061778c3b8f4a7ca"},"schema_version":"1.0"},"canonical_sha256":"9f76a0450a5db90be8d2400a05773ea612d5d6ac124004589ad8b13eb58f5674","source":{"kind":"arxiv","id":"2108.07101","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.07101","created_at":"2026-07-05T04:20:53Z"},{"alias_kind":"arxiv_version","alias_value":"2108.07101v2","created_at":"2026-07-05T04:20:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.07101","created_at":"2026-07-05T04:20:53Z"},{"alias_kind":"pith_short_12","alias_value":"T53KARIKLW4Q","created_at":"2026-07-05T04:20:53Z"},{"alias_kind":"pith_short_16","alias_value":"T53KARIKLW4QX2GS","created_at":"2026-07-05T04:20:53Z"},{"alias_kind":"pith_short_8","alias_value":"T53KARIK","created_at":"2026-07-05T04:20:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:T53KARIKLW4QX2GSIAFAK5Z6UY","target":"record","payload":{"canonical_record":{"source":{"id":"2108.07101","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-08-16T14:12:36Z","cross_cats_sorted":["astro-ph.CO","hep-th"],"title_canon_sha256":"d7e5f4de039b8c92bd70d0d6bd0da932dc9164eaf1e683662989222086f65625","abstract_canon_sha256":"526f0bbfb3a24c8ea4294fd7a54a7cf482f0046864f09eab061778c3b8f4a7ca"},"schema_version":"1.0"},"canonical_sha256":"9f76a0450a5db90be8d2400a05773ea612d5d6ac124004589ad8b13eb58f5674","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:20:53.449551Z","signature_b64":"ObMTmZ83Ky6b+j9JcnnrVn48S/d1c+QnUhJxUEEmfY2ZnSjQ49pu7lVgRBus+pZo9LeBFe551qh5W/dwZ0ZtBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9f76a0450a5db90be8d2400a05773ea612d5d6ac124004589ad8b13eb58f5674","last_reissued_at":"2026-07-05T04:20:53.449049Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:20:53.449049Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2108.07101","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":"2026-07-05T04:20:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RuJJJjUuoW1/VwdkFu5hYStL3ztBX0Jnfy7r55Kx8WLnDpX+zL+IsQb8ZknA/wGo5SgXRGKOdeeslUdL4OuPBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T01:47:18.186753Z"},"content_sha256":"dfeb6a4a66d35e12010b35fd63485d5c8b140a5a18cb3145aa364e08e7338b31","schema_version":"1.0","event_id":"sha256:dfeb6a4a66d35e12010b35fd63485d5c8b140a5a18cb3145aa364e08e7338b31"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:T53KARIKLW4QX2GSIAFAK5Z6UY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Entropy, Black holes, and the New Cyclic Universe","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","hep-th"],"primary_cat":"gr-qc","authors_text":"Anna Ijjas, Paul J. Steinhardt","submitted_at":"2021-08-16T14:12:36Z","abstract_excerpt":"We track the evolution of entropy and black holes in a cyclic universe that undergoes repeated intervals of expansion followed by slow contraction and a smooth (non-singular) bounce. In this kind of cyclic scenario, there is no big crunch and no chaotic mixmaster behavior. We explain why the entropy following each bounce is naturally partitioned into near-maximal entropy in the matter-radiation sector and near-minimal in the gravitational sector, satisfying the Weyl curvature conditions conjectured to be essential for a cosmology consistent with observations. As a result, this kind of cyclic u"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.07101","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2108.07101/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T04:20:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"g2UBdsubtfxHW0VEqYfuBFacnlcucHVqpcjmS0Iv/BcnB//52tyO+DjUQC9kVyax07E3qG0uUFU5MpolcNdzCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T01:47:18.187651Z"},"content_sha256":"b641094ccc94e3956d645dde207c0e54d7fb37a6cfadcfee67ec1449dd8b70ba","schema_version":"1.0","event_id":"sha256:b641094ccc94e3956d645dde207c0e54d7fb37a6cfadcfee67ec1449dd8b70ba"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/T53KARIKLW4QX2GSIAFAK5Z6UY/bundle.json","state_url":"https://pith.science/pith/T53KARIKLW4QX2GSIAFAK5Z6UY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/T53KARIKLW4QX2GSIAFAK5Z6UY/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":"2026-08-05T01:47:18Z","links":{"resolver":"https://pith.science/pith/T53KARIKLW4QX2GSIAFAK5Z6UY","bundle":"https://pith.science/pith/T53KARIKLW4QX2GSIAFAK5Z6UY/bundle.json","state":"https://pith.science/pith/T53KARIKLW4QX2GSIAFAK5Z6UY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/T53KARIKLW4QX2GSIAFAK5Z6UY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:T53KARIKLW4QX2GSIAFAK5Z6UY","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":"526f0bbfb3a24c8ea4294fd7a54a7cf482f0046864f09eab061778c3b8f4a7ca","cross_cats_sorted":["astro-ph.CO","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-08-16T14:12:36Z","title_canon_sha256":"d7e5f4de039b8c92bd70d0d6bd0da932dc9164eaf1e683662989222086f65625"},"schema_version":"1.0","source":{"id":"2108.07101","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.07101","created_at":"2026-07-05T04:20:53Z"},{"alias_kind":"arxiv_version","alias_value":"2108.07101v2","created_at":"2026-07-05T04:20:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.07101","created_at":"2026-07-05T04:20:53Z"},{"alias_kind":"pith_short_12","alias_value":"T53KARIKLW4Q","created_at":"2026-07-05T04:20:53Z"},{"alias_kind":"pith_short_16","alias_value":"T53KARIKLW4QX2GS","created_at":"2026-07-05T04:20:53Z"},{"alias_kind":"pith_short_8","alias_value":"T53KARIK","created_at":"2026-07-05T04:20:53Z"}],"graph_snapshots":[{"event_id":"sha256:b641094ccc94e3956d645dde207c0e54d7fb37a6cfadcfee67ec1449dd8b70ba","target":"graph","created_at":"2026-07-05T04:20:53Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2108.07101/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We track the evolution of entropy and black holes in a cyclic universe that undergoes repeated intervals of expansion followed by slow contraction and a smooth (non-singular) bounce. In this kind of cyclic scenario, there is no big crunch and no chaotic mixmaster behavior. We explain why the entropy following each bounce is naturally partitioned into near-maximal entropy in the matter-radiation sector and near-minimal in the gravitational sector, satisfying the Weyl curvature conditions conjectured to be essential for a cosmology consistent with observations. As a result, this kind of cyclic u","authors_text":"Anna Ijjas, Paul J. Steinhardt","cross_cats":["astro-ph.CO","hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-08-16T14:12:36Z","title":"Entropy, Black holes, and the New Cyclic Universe"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.07101","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:dfeb6a4a66d35e12010b35fd63485d5c8b140a5a18cb3145aa364e08e7338b31","target":"record","created_at":"2026-07-05T04:20:53Z","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":"526f0bbfb3a24c8ea4294fd7a54a7cf482f0046864f09eab061778c3b8f4a7ca","cross_cats_sorted":["astro-ph.CO","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-08-16T14:12:36Z","title_canon_sha256":"d7e5f4de039b8c92bd70d0d6bd0da932dc9164eaf1e683662989222086f65625"},"schema_version":"1.0","source":{"id":"2108.07101","kind":"arxiv","version":2}},"canonical_sha256":"9f76a0450a5db90be8d2400a05773ea612d5d6ac124004589ad8b13eb58f5674","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9f76a0450a5db90be8d2400a05773ea612d5d6ac124004589ad8b13eb58f5674","first_computed_at":"2026-07-05T04:20:53.449049Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:20:53.449049Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ObMTmZ83Ky6b+j9JcnnrVn48S/d1c+QnUhJxUEEmfY2ZnSjQ49pu7lVgRBus+pZo9LeBFe551qh5W/dwZ0ZtBw==","signature_status":"signed_v1","signed_at":"2026-07-05T04:20:53.449551Z","signed_message":"canonical_sha256_bytes"},"source_id":"2108.07101","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:dfeb6a4a66d35e12010b35fd63485d5c8b140a5a18cb3145aa364e08e7338b31","sha256:b641094ccc94e3956d645dde207c0e54d7fb37a6cfadcfee67ec1449dd8b70ba"],"state_sha256":"1fc909bac8249e8abe1d5d5d98dbfc554976ba4e33e339ec746e67a13ad33dd8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/5bFDYvZ+x9cOoWDcmfkUdHqvzzYQYZwe58GFYNP4SEVza6h6jYgTD8SXeZAn2VFrbxeUboK1enITr9HWH3KAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T01:47:18.194819Z","bundle_sha256":"5ad5f814d30d5734ae9dff8a3caa2309dc2e0b133d9a0abab21ebd943d628ed5"}}