{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2014:IU7RK3FGKAQ54PTVIRDYUVYGOB","short_pith_number":"pith:IU7RK3FG","schema_version":"1.0","canonical_sha256":"453f156ca65021de3e7544478a5706706840a308b53688dcb55f4bfa294a389c","source":{"kind":"arxiv","id":"1408.0633","version":2},"attestation_state":"computed","paper":{"title":"Friedmann cosmology with particle creation in modified $f(R,T)$ gravity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"C.P.Singh, Vijay Singh","submitted_at":"2014-08-04T10:25:38Z","abstract_excerpt":"The theoretical and observational consequences of thermodynamics of open systems, which allow particle creation are investigated in modified $f(R,T)$ ($R$ is the Ricci scalar and $T$ is the trace of energy-momentum tensor) theory of gravity within the framework of a flat Friedmann-Robertson-Walker line element. A simplest particular model $f(R,T)=R+2f(T)$ and \"gamma-law\" equation of state $p=(\\gamma-1)\\rho$ are assumed to explore the role of particle creation in the early and late time evolution of the universe. A power-law expansion model is proposed for $0\\leq \\gamma \\leq 2$ by considering t"},"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":"1408.0633","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-08-04T10:25:38Z","cross_cats_sorted":[],"title_canon_sha256":"64bc2f73e75afc650f1dce86353c2ab22db3679d1d419a76875abe196c5801df","abstract_canon_sha256":"8b619df791ac828fa261b0311582fa71d7ac8ef7a09962652875e13816351150"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:44:25.373141Z","signature_b64":"ym8LtWQ4BXCG2axhRBQcYn+KqKK6CfaOk9ZJN6snQabdic9tlMppXfTIstThdhaRsvap6uNU3xs8TjifGoYmBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"453f156ca65021de3e7544478a5706706840a308b53688dcb55f4bfa294a389c","last_reissued_at":"2026-05-18T02:44:25.372780Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:44:25.372780Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Friedmann cosmology with particle creation in modified $f(R,T)$ gravity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"C.P.Singh, Vijay Singh","submitted_at":"2014-08-04T10:25:38Z","abstract_excerpt":"The theoretical and observational consequences of thermodynamics of open systems, which allow particle creation are investigated in modified $f(R,T)$ ($R$ is the Ricci scalar and $T$ is the trace of energy-momentum tensor) theory of gravity within the framework of a flat Friedmann-Robertson-Walker line element. A simplest particular model $f(R,T)=R+2f(T)$ and \"gamma-law\" equation of state $p=(\\gamma-1)\\rho$ are assumed to explore the role of particle creation in the early and late time evolution of the universe. A power-law expansion model is proposed for $0\\leq \\gamma \\leq 2$ by considering t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1408.0633","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":""},"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":"1408.0633","created_at":"2026-05-18T02:44:25.372837+00:00"},{"alias_kind":"arxiv_version","alias_value":"1408.0633v2","created_at":"2026-05-18T02:44:25.372837+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1408.0633","created_at":"2026-05-18T02:44:25.372837+00:00"},{"alias_kind":"pith_short_12","alias_value":"IU7RK3FGKAQ5","created_at":"2026-05-18T12:28:33.132498+00:00"},{"alias_kind":"pith_short_16","alias_value":"IU7RK3FGKAQ54PTV","created_at":"2026-05-18T12:28:33.132498+00:00"},{"alias_kind":"pith_short_8","alias_value":"IU7RK3FG","created_at":"2026-05-18T12:28:33.132498+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/IU7RK3FGKAQ54PTVIRDYUVYGOB","json":"https://pith.science/pith/IU7RK3FGKAQ54PTVIRDYUVYGOB.json","graph_json":"https://pith.science/api/pith-number/IU7RK3FGKAQ54PTVIRDYUVYGOB/graph.json","events_json":"https://pith.science/api/pith-number/IU7RK3FGKAQ54PTVIRDYUVYGOB/events.json","paper":"https://pith.science/paper/IU7RK3FG"},"agent_actions":{"view_html":"https://pith.science/pith/IU7RK3FGKAQ54PTVIRDYUVYGOB","download_json":"https://pith.science/pith/IU7RK3FGKAQ54PTVIRDYUVYGOB.json","view_paper":"https://pith.science/paper/IU7RK3FG","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1408.0633&json=true","fetch_graph":"https://pith.science/api/pith-number/IU7RK3FGKAQ54PTVIRDYUVYGOB/graph.json","fetch_events":"https://pith.science/api/pith-number/IU7RK3FGKAQ54PTVIRDYUVYGOB/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/IU7RK3FGKAQ54PTVIRDYUVYGOB/action/timestamp_anchor","attest_storage":"https://pith.science/pith/IU7RK3FGKAQ54PTVIRDYUVYGOB/action/storage_attestation","attest_author":"https://pith.science/pith/IU7RK3FGKAQ54PTVIRDYUVYGOB/action/author_attestation","sign_citation":"https://pith.science/pith/IU7RK3FGKAQ54PTVIRDYUVYGOB/action/citation_signature","submit_replication":"https://pith.science/pith/IU7RK3FGKAQ54PTVIRDYUVYGOB/action/replication_record"}},"created_at":"2026-05-18T02:44:25.372837+00:00","updated_at":"2026-05-18T02:44:25.372837+00:00"}