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We consider a CPT-violating interaction in the photon sector $\\mathcal{L}_{\\rm cs}\\sim p_\\mu A_\\nu \\tilde{F}^{\\mu\\nu}$ which gives rise to a rotation of the polarization vectors of the propagating CMB photons. By combining the nine-year WMAP, BOOMERanG 2003 and BICEP1 observations, we obtain the current constraint on the isotropic rotation angle $\\bar{\\alpha} = -2.12 \\pm 1.14$ ($1\\sigma$), indicating an about $2\\sigma$ significance of the CPT violati"},"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":"1405.5637","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2014-05-22T06:55:33Z","cross_cats_sorted":["hep-ph","hep-th"],"title_canon_sha256":"920442ece49c175bdf3acfe7273dfbb4d14108b4bc493942af1f9495b19b7203","abstract_canon_sha256":"60148495a566c9a39bc45cf60bfeadeae38b144385d56d2f008b2fe7e7cf575a"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:43:09.432214Z","signature_b64":"yoIeqbDuxfZTWBAZCrmf9oXQ7thfGiZs6tqmRXtL5gLYd4RNCFLt963ZYlkpnUTQoQeNfyQuAkbBIkLJ5v4ICQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"10739944f261c0d3c8be0a29cba1db14f099ea573710d2cb8e0c13a76b8b2c77","last_reissued_at":"2026-05-18T01:43:09.431441Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:43:09.431441Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Testing CPT Symmetry with Current and Future CMB Measurements","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ph","hep-th"],"primary_cat":"astro-ph.CO","authors_text":"Hong Li, Jun-Qing Xia, Mingzhe Li, Si-Yu Li, Xinmin Zhang","submitted_at":"2014-05-22T06:55:33Z","abstract_excerpt":"In this paper we use the current and future cosmic microwave background (CMB) experiments to test the Charge-Parity-Time Reversal (CPT) symmetry. 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