{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2021:6B2PJBTYKWDY247R5U3DOM6KYX","short_pith_number":"pith:6B2PJBTY","schema_version":"1.0","canonical_sha256":"f074f4867855878d73f1ed363733cac5f9b3ac0ab99642eb3fa3ad78fa1dbc0b","source":{"kind":"arxiv","id":"2109.01052","version":2},"attestation_state":"computed","paper":{"title":"The dark side of the torsion: Dark Energy from propagating torsion","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc","hep-ph"],"primary_cat":"astro-ph.CO","authors_text":"Armin van de Venn, David Benisty, David Vasak, Eduardo I. Guendelman, Horst Stoecker, J\\\"urgen Struckmeier","submitted_at":"2021-09-02T16:07:53Z","abstract_excerpt":"An extension to the Einstein-Cartan (EC) action is discussed in terms of cosmological solutions. The torsion incorporated in the EC Lagrangian is assumed to be totally anti-symmetric, represented by a time-like axial vector $S^\\mu$. The dynamics of torsion is invoked by a novel kinetic term. Here we show that this kinetic term gives rise to dark energy, while the quadratic torsion term, emanating from the EC part, represents a stiff fluid that leads to a bouncing cosmology solution. A constraint on the bouncing solution is calculated using cosmological data from different epochs."},"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":"2109.01052","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2021-09-02T16:07:53Z","cross_cats_sorted":["gr-qc","hep-ph"],"title_canon_sha256":"2dc8977443388a6a8eb6aa616cd2cd23bac3eae467f64e54e0cb3f1e71ef7786","abstract_canon_sha256":"9af926328c5d4f16357a098f5a8d11350b8c272083ad72b7e88d9fa1578dff65"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:09:15.139704Z","signature_b64":"s3Zr9B0HvsHlaJGwh2FwYnQdm/GObp6Fy9437y3b6kUaqpQ23XupGjeI9AkCEDrn720Uzfu+JCM0HUV/DXSoAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f074f4867855878d73f1ed363733cac5f9b3ac0ab99642eb3fa3ad78fa1dbc0b","last_reissued_at":"2026-07-05T04:09:15.139273Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:09:15.139273Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The dark side of the torsion: Dark Energy from propagating torsion","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc","hep-ph"],"primary_cat":"astro-ph.CO","authors_text":"Armin van de Venn, David Benisty, David Vasak, Eduardo I. Guendelman, Horst Stoecker, J\\\"urgen Struckmeier","submitted_at":"2021-09-02T16:07:53Z","abstract_excerpt":"An extension to the Einstein-Cartan (EC) action is discussed in terms of cosmological solutions. The torsion incorporated in the EC Lagrangian is assumed to be totally anti-symmetric, represented by a time-like axial vector $S^\\mu$. The dynamics of torsion is invoked by a novel kinetic term. Here we show that this kinetic term gives rise to dark energy, while the quadratic torsion term, emanating from the EC part, represents a stiff fluid that leads to a bouncing cosmology solution. A constraint on the bouncing solution is calculated using cosmological data from different epochs."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.01052","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/2109.01052/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":"2109.01052","created_at":"2026-07-05T04:09:15.139343+00:00"},{"alias_kind":"arxiv_version","alias_value":"2109.01052v2","created_at":"2026-07-05T04:09:15.139343+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.01052","created_at":"2026-07-05T04:09:15.139343+00:00"},{"alias_kind":"pith_short_12","alias_value":"6B2PJBTYKWDY","created_at":"2026-07-05T04:09:15.139343+00:00"},{"alias_kind":"pith_short_16","alias_value":"6B2PJBTYKWDY247R","created_at":"2026-07-05T04:09:15.139343+00:00"},{"alias_kind":"pith_short_8","alias_value":"6B2PJBTY","created_at":"2026-07-05T04:09:15.139343+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":0,"sample":[{"citing_arxiv_id":"2606.27433","citing_title":"Tidal Forces in the Presence of Torsion and Nonmetricity","ref_index":20,"is_internal_anchor":false}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/6B2PJBTYKWDY247R5U3DOM6KYX","json":"https://pith.science/pith/6B2PJBTYKWDY247R5U3DOM6KYX.json","graph_json":"https://pith.science/api/pith-number/6B2PJBTYKWDY247R5U3DOM6KYX/graph.json","events_json":"https://pith.science/api/pith-number/6B2PJBTYKWDY247R5U3DOM6KYX/events.json","paper":"https://pith.science/paper/6B2PJBTY"},"agent_actions":{"view_html":"https://pith.science/pith/6B2PJBTYKWDY247R5U3DOM6KYX","download_json":"https://pith.science/pith/6B2PJBTYKWDY247R5U3DOM6KYX.json","view_paper":"https://pith.science/paper/6B2PJBTY","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2109.01052&json=true","fetch_graph":"https://pith.science/api/pith-number/6B2PJBTYKWDY247R5U3DOM6KYX/graph.json","fetch_events":"https://pith.science/api/pith-number/6B2PJBTYKWDY247R5U3DOM6KYX/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/6B2PJBTYKWDY247R5U3DOM6KYX/action/timestamp_anchor","attest_storage":"https://pith.science/pith/6B2PJBTYKWDY247R5U3DOM6KYX/action/storage_attestation","attest_author":"https://pith.science/pith/6B2PJBTYKWDY247R5U3DOM6KYX/action/author_attestation","sign_citation":"https://pith.science/pith/6B2PJBTYKWDY247R5U3DOM6KYX/action/citation_signature","submit_replication":"https://pith.science/pith/6B2PJBTYKWDY247R5U3DOM6KYX/action/replication_record"}},"created_at":"2026-07-05T04:09:15.139343+00:00","updated_at":"2026-07-05T04:09:15.139343+00:00"}