{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:YKZM44PLZGXQSQEYFVSG3RYTE5","short_pith_number":"pith:YKZM44PL","canonical_record":{"source":{"id":"2108.06077","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-08-13T06:13:41Z","cross_cats_sorted":[],"title_canon_sha256":"e7b2d7af8c545424dc53c11b4266c5f99c30425f0dbac761ad63c9f097c3908a","abstract_canon_sha256":"8b45e7ab25d72d4ffd38cff814e429a229d65fd96f7e6a52c47a4b635fb9908a"},"schema_version":"1.0"},"canonical_sha256":"c2b2ce71ebc9af0940982d646dc713276a4ed3175ebe17882e39602327a3cbef","source":{"kind":"arxiv","id":"2108.06077","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.06077","created_at":"2026-07-05T04:35:56Z"},{"alias_kind":"arxiv_version","alias_value":"2108.06077v1","created_at":"2026-07-05T04:35:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.06077","created_at":"2026-07-05T04:35:56Z"},{"alias_kind":"pith_short_12","alias_value":"YKZM44PLZGXQ","created_at":"2026-07-05T04:35:56Z"},{"alias_kind":"pith_short_16","alias_value":"YKZM44PLZGXQSQEY","created_at":"2026-07-05T04:35:56Z"},{"alias_kind":"pith_short_8","alias_value":"YKZM44PL","created_at":"2026-07-05T04:35:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:YKZM44PLZGXQSQEYFVSG3RYTE5","target":"record","payload":{"canonical_record":{"source":{"id":"2108.06077","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-08-13T06:13:41Z","cross_cats_sorted":[],"title_canon_sha256":"e7b2d7af8c545424dc53c11b4266c5f99c30425f0dbac761ad63c9f097c3908a","abstract_canon_sha256":"8b45e7ab25d72d4ffd38cff814e429a229d65fd96f7e6a52c47a4b635fb9908a"},"schema_version":"1.0"},"canonical_sha256":"c2b2ce71ebc9af0940982d646dc713276a4ed3175ebe17882e39602327a3cbef","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:35:56.755083Z","signature_b64":"Yk65HO4x0ys2OkdYlW/StgVCikEivXLkt6ERixHQWdpsZf3OmeCyTgT3qjYbk6Wotc4eN+8kHLYxMxL7a50nCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c2b2ce71ebc9af0940982d646dc713276a4ed3175ebe17882e39602327a3cbef","last_reissued_at":"2026-07-05T04:35:56.754700Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:35:56.754700Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2108.06077","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":"2026-07-05T04:35:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tezvpp9v2wUWVpbcYc7SWXMsDklnQtYSXXOOGhh848TPqQr3qui24fP+KNgfkzpYyipCZGavvZM7XOZblXVmBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T07:34:21.742135Z"},"content_sha256":"90a9b9178fbef98dbf58a33cdda4224135ed2a9dbef4c71ce24713467e13343f","schema_version":"1.0","event_id":"sha256:90a9b9178fbef98dbf58a33cdda4224135ed2a9dbef4c71ce24713467e13343f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:YKZM44PLZGXQSQEYFVSG3RYTE5","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Cosmological aspects of $f(R,T)$ gravity in a simple model with a parametrization of $q$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Ritika Nagpal, Shibesh Kumar Jas Pacif","submitted_at":"2021-08-13T06:13:41Z","abstract_excerpt":"In this paper, we have considered a quadratic variation of the deceleration parameter ($q$) as a function of cosmic time ($t$) which describes a smooth transition from the decelerating phase of the Universe to an accelerating one and also show some distinctive feature from the standard model. The logical move of this article is against the behavior of the future Universe, \\textit{i.e.} whether the Universe expands forever or ends with a Big Rip, and we observe that the outcome of the considered parametrization comes in favor of Big Rip future of the Universe. The whole set up of the parametriz"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.06077","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/2108.06077/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":"2026-07-05T04:35:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hIZejg/rucsQRSr1ATsR/w4kxWqaP9v8/R+mwTsl2rAC2fuF+ZHoNHCRmSMtrD755jf3jgIo0kjx7UQ0zcr6CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T07:34:21.742520Z"},"content_sha256":"b158f4e3a761562fb0d162d9340acd2c7e47944483f863279d27e5576e72a040","schema_version":"1.0","event_id":"sha256:b158f4e3a761562fb0d162d9340acd2c7e47944483f863279d27e5576e72a040"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YKZM44PLZGXQSQEYFVSG3RYTE5/bundle.json","state_url":"https://pith.science/pith/YKZM44PLZGXQSQEYFVSG3RYTE5/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YKZM44PLZGXQSQEYFVSG3RYTE5/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":"2026-07-06T07:34:21Z","links":{"resolver":"https://pith.science/pith/YKZM44PLZGXQSQEYFVSG3RYTE5","bundle":"https://pith.science/pith/YKZM44PLZGXQSQEYFVSG3RYTE5/bundle.json","state":"https://pith.science/pith/YKZM44PLZGXQSQEYFVSG3RYTE5/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YKZM44PLZGXQSQEYFVSG3RYTE5/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:YKZM44PLZGXQSQEYFVSG3RYTE5","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":"8b45e7ab25d72d4ffd38cff814e429a229d65fd96f7e6a52c47a4b635fb9908a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-08-13T06:13:41Z","title_canon_sha256":"e7b2d7af8c545424dc53c11b4266c5f99c30425f0dbac761ad63c9f097c3908a"},"schema_version":"1.0","source":{"id":"2108.06077","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2108.06077","created_at":"2026-07-05T04:35:56Z"},{"alias_kind":"arxiv_version","alias_value":"2108.06077v1","created_at":"2026-07-05T04:35:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2108.06077","created_at":"2026-07-05T04:35:56Z"},{"alias_kind":"pith_short_12","alias_value":"YKZM44PLZGXQ","created_at":"2026-07-05T04:35:56Z"},{"alias_kind":"pith_short_16","alias_value":"YKZM44PLZGXQSQEY","created_at":"2026-07-05T04:35:56Z"},{"alias_kind":"pith_short_8","alias_value":"YKZM44PL","created_at":"2026-07-05T04:35:56Z"}],"graph_snapshots":[{"event_id":"sha256:b158f4e3a761562fb0d162d9340acd2c7e47944483f863279d27e5576e72a040","target":"graph","created_at":"2026-07-05T04:35:56Z","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/2108.06077/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In this paper, we have considered a quadratic variation of the deceleration parameter ($q$) as a function of cosmic time ($t$) which describes a smooth transition from the decelerating phase of the Universe to an accelerating one and also show some distinctive feature from the standard model. The logical move of this article is against the behavior of the future Universe, \\textit{i.e.} whether the Universe expands forever or ends with a Big Rip, and we observe that the outcome of the considered parametrization comes in favor of Big Rip future of the Universe. The whole set up of the parametriz","authors_text":"Ritika Nagpal, Shibesh Kumar Jas Pacif","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-08-13T06:13:41Z","title":"Cosmological aspects of $f(R,T)$ gravity in a simple model with a parametrization of $q$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2108.06077","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":"sha256:90a9b9178fbef98dbf58a33cdda4224135ed2a9dbef4c71ce24713467e13343f","target":"record","created_at":"2026-07-05T04:35:56Z","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":"8b45e7ab25d72d4ffd38cff814e429a229d65fd96f7e6a52c47a4b635fb9908a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-08-13T06:13:41Z","title_canon_sha256":"e7b2d7af8c545424dc53c11b4266c5f99c30425f0dbac761ad63c9f097c3908a"},"schema_version":"1.0","source":{"id":"2108.06077","kind":"arxiv","version":1}},"canonical_sha256":"c2b2ce71ebc9af0940982d646dc713276a4ed3175ebe17882e39602327a3cbef","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c2b2ce71ebc9af0940982d646dc713276a4ed3175ebe17882e39602327a3cbef","first_computed_at":"2026-07-05T04:35:56.754700Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:35:56.754700Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Yk65HO4x0ys2OkdYlW/StgVCikEivXLkt6ERixHQWdpsZf3OmeCyTgT3qjYbk6Wotc4eN+8kHLYxMxL7a50nCg==","signature_status":"signed_v1","signed_at":"2026-07-05T04:35:56.755083Z","signed_message":"canonical_sha256_bytes"},"source_id":"2108.06077","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:90a9b9178fbef98dbf58a33cdda4224135ed2a9dbef4c71ce24713467e13343f","sha256:b158f4e3a761562fb0d162d9340acd2c7e47944483f863279d27e5576e72a040"],"state_sha256":"a1f81ea4fa838dbf86fb2c76dafc5d0991237414f742889d166aa459c5153bbc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1OaQnnQ5n77qC1qloQ+zfaYXQ9YM5ivkWewdg9Q5UAkZtDZCRVSp5+Cs6cF+BpW0XivMN7a9df5aw9DIq4BDAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-06T07:34:21.744478Z","bundle_sha256":"1744a81feee0cb98d179cfd38e231fab3132237c8ffe8cdf44b4d8312dc582f8"}}