{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:FIXNFCUU62HRS5BHMRJNUMMILM","short_pith_number":"pith:FIXNFCUU","canonical_record":{"source":{"id":"2003.14211","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2020-03-29T12:01:43Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"15625c6f9ad6dc9c7c148231b089f2831f752af6dd66fd6ae726bd0920ac6aea","abstract_canon_sha256":"d087589ed38b3ac87958c428f68b2160814dc88a109a179bc20d6e9ea30e7ee6"},"schema_version":"1.0"},"canonical_sha256":"2a2ed28a94f68f1974276452da31885b3f154a07278c2698124eb3280b20b09e","source":{"kind":"arxiv","id":"2003.14211","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2003.14211","created_at":"2026-07-05T00:52:53Z"},{"alias_kind":"arxiv_version","alias_value":"2003.14211v1","created_at":"2026-07-05T00:52:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2003.14211","created_at":"2026-07-05T00:52:53Z"},{"alias_kind":"pith_short_12","alias_value":"FIXNFCUU62HR","created_at":"2026-07-05T00:52:53Z"},{"alias_kind":"pith_short_16","alias_value":"FIXNFCUU62HRS5BH","created_at":"2026-07-05T00:52:53Z"},{"alias_kind":"pith_short_8","alias_value":"FIXNFCUU","created_at":"2026-07-05T00:52:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:FIXNFCUU62HRS5BHMRJNUMMILM","target":"record","payload":{"canonical_record":{"source":{"id":"2003.14211","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2020-03-29T12:01:43Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"15625c6f9ad6dc9c7c148231b089f2831f752af6dd66fd6ae726bd0920ac6aea","abstract_canon_sha256":"d087589ed38b3ac87958c428f68b2160814dc88a109a179bc20d6e9ea30e7ee6"},"schema_version":"1.0"},"canonical_sha256":"2a2ed28a94f68f1974276452da31885b3f154a07278c2698124eb3280b20b09e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:52:53.597561Z","signature_b64":"wm/84pLtMvVQJdVwzbwQ/wP6+v700LmXlZKOYXhmB8OTTN9k/gajD3EKpQG3zHmWZUM0YHcfVq5ue8h7lOwfDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2a2ed28a94f68f1974276452da31885b3f154a07278c2698124eb3280b20b09e","last_reissued_at":"2026-07-05T00:52:53.597139Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:52:53.597139Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2003.14211","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":"2026-07-05T00:52:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aYYEW+WG0PeM7XlGjAzFZ3GibtsOHA6tFrfQ8WZ0VT/gf9UwO2MHVFTAGutdas8Fj40rpBcRyaLkA05Ao6FuDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T16:52:39.560642Z"},"content_sha256":"5578b44e7ccecc23a230b92453a44c4f606088ded25a5e6090817a93be5524ec","schema_version":"1.0","event_id":"sha256:5578b44e7ccecc23a230b92453a44c4f606088ded25a5e6090817a93be5524ec"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:FIXNFCUU62HRS5BHMRJNUMMILM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Comprehensive Analysis of a Non-Singular Bounce in $f(R,T)$ Gravitation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-th"],"primary_cat":"gr-qc","authors_text":"P.K. Sahoo, Snehasish Bhattacharjee","submitted_at":"2020-03-29T12:01:43Z","abstract_excerpt":"The present paper is devoted to the study of bouncing cosmology in $f(R,T)$ modified gravity where we presume $f(R,T) = R + 2 \\lambda T$, with $R$ the Ricci scalar, $T$ the trace of energy momentum tensor and $\\lambda$ the model parameter. We present here a novel parametrization of Hubble parameter which is apt in representing a successful bouncing scenario undergoing no singularity. We proceed to present a complete analysis of the proposed bouncing model by studying the evolution of primordial curvature perturbations, energy conditions and stability against linear homogeneous perturbations in"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2003.14211","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/2003.14211/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":"2026-07-05T00:52:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zUAfs42xpZIKnDDzSd6K5BEMfRS5O5oZFxy8xnzgctcVo5mm8k/D6m0irthiCpNPCXcENLtlGNR67zjHD3fMDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T16:52:39.561250Z"},"content_sha256":"f02d94e0a249b1f0f0a830b59cf118bb8f1312ae8bfe9b120e395103feadb140","schema_version":"1.0","event_id":"sha256:f02d94e0a249b1f0f0a830b59cf118bb8f1312ae8bfe9b120e395103feadb140"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FIXNFCUU62HRS5BHMRJNUMMILM/bundle.json","state_url":"https://pith.science/pith/FIXNFCUU62HRS5BHMRJNUMMILM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FIXNFCUU62HRS5BHMRJNUMMILM/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":"2026-08-16T16:52:39Z","links":{"resolver":"https://pith.science/pith/FIXNFCUU62HRS5BHMRJNUMMILM","bundle":"https://pith.science/pith/FIXNFCUU62HRS5BHMRJNUMMILM/bundle.json","state":"https://pith.science/pith/FIXNFCUU62HRS5BHMRJNUMMILM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FIXNFCUU62HRS5BHMRJNUMMILM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:FIXNFCUU62HRS5BHMRJNUMMILM","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":"d087589ed38b3ac87958c428f68b2160814dc88a109a179bc20d6e9ea30e7ee6","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2020-03-29T12:01:43Z","title_canon_sha256":"15625c6f9ad6dc9c7c148231b089f2831f752af6dd66fd6ae726bd0920ac6aea"},"schema_version":"1.0","source":{"id":"2003.14211","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2003.14211","created_at":"2026-07-05T00:52:53Z"},{"alias_kind":"arxiv_version","alias_value":"2003.14211v1","created_at":"2026-07-05T00:52:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2003.14211","created_at":"2026-07-05T00:52:53Z"},{"alias_kind":"pith_short_12","alias_value":"FIXNFCUU62HR","created_at":"2026-07-05T00:52:53Z"},{"alias_kind":"pith_short_16","alias_value":"FIXNFCUU62HRS5BH","created_at":"2026-07-05T00:52:53Z"},{"alias_kind":"pith_short_8","alias_value":"FIXNFCUU","created_at":"2026-07-05T00:52:53Z"}],"graph_snapshots":[{"event_id":"sha256:f02d94e0a249b1f0f0a830b59cf118bb8f1312ae8bfe9b120e395103feadb140","target":"graph","created_at":"2026-07-05T00:52:53Z","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/2003.14211/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The present paper is devoted to the study of bouncing cosmology in $f(R,T)$ modified gravity where we presume $f(R,T) = R + 2 \\lambda T$, with $R$ the Ricci scalar, $T$ the trace of energy momentum tensor and $\\lambda$ the model parameter. We present here a novel parametrization of Hubble parameter which is apt in representing a successful bouncing scenario undergoing no singularity. We proceed to present a complete analysis of the proposed bouncing model by studying the evolution of primordial curvature perturbations, energy conditions and stability against linear homogeneous perturbations in","authors_text":"P.K. Sahoo, Snehasish Bhattacharjee","cross_cats":["hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2020-03-29T12:01:43Z","title":"Comprehensive Analysis of a Non-Singular Bounce in $f(R,T)$ Gravitation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2003.14211","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":"sha256:5578b44e7ccecc23a230b92453a44c4f606088ded25a5e6090817a93be5524ec","target":"record","created_at":"2026-07-05T00:52:53Z","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":"d087589ed38b3ac87958c428f68b2160814dc88a109a179bc20d6e9ea30e7ee6","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2020-03-29T12:01:43Z","title_canon_sha256":"15625c6f9ad6dc9c7c148231b089f2831f752af6dd66fd6ae726bd0920ac6aea"},"schema_version":"1.0","source":{"id":"2003.14211","kind":"arxiv","version":1}},"canonical_sha256":"2a2ed28a94f68f1974276452da31885b3f154a07278c2698124eb3280b20b09e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2a2ed28a94f68f1974276452da31885b3f154a07278c2698124eb3280b20b09e","first_computed_at":"2026-07-05T00:52:53.597139Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:52:53.597139Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wm/84pLtMvVQJdVwzbwQ/wP6+v700LmXlZKOYXhmB8OTTN9k/gajD3EKpQG3zHmWZUM0YHcfVq5ue8h7lOwfDA==","signature_status":"signed_v1","signed_at":"2026-07-05T00:52:53.597561Z","signed_message":"canonical_sha256_bytes"},"source_id":"2003.14211","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5578b44e7ccecc23a230b92453a44c4f606088ded25a5e6090817a93be5524ec","sha256:f02d94e0a249b1f0f0a830b59cf118bb8f1312ae8bfe9b120e395103feadb140"],"state_sha256":"c12248d841522addb9526fb0ff205523771afa4dd42d4ffbf34b063ea658d813"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1h7V3Iv2rw//+waTlJe/9/1ly1yaE0SELAwlUJc6jmiPUhiH4mzaCeHmRFoq2aiZZ5d/qei0NdPZzMl10+FwAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T16:52:39.566229Z","bundle_sha256":"0a96cfeb5e9c3a037e54a3f61d4d5b32b775cbdddb89e95cdde998132be93743"}}