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Through this coupling, the rolling inflaton produces quanta of the gauge field, that in their turn source the tensor components of the metric perturbations. Due to the parity-violating nature of the system, the right- and the left-handed tensor modes have different amplitudes. Such an asymmetry manifests itself in the form of non-vanishing TB and EB correlation functions in the Cosmic Microwave Background (CMB). We compute the amplitude of the parity-v"},"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":"1101.1525","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-01-07T21:04:03Z","cross_cats_sorted":["hep-ph","hep-th"],"title_canon_sha256":"b56bb9f497b6d4a0da9160f501db62552611475838b06f938c733155039faffb","abstract_canon_sha256":"42a907181e65f14453d9794737b422f565feb8cc2413b5a558551149a3b22818"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:04:11.728642Z","signature_b64":"qWds+SkQr0BpAki+V6ZknNQgSdRyAAxuzBW8k1sEZu4TyeNZ9LQ2DKiveGL0zhuRJ50y3ZD1FgbFNvEcZItqAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cc17c5c5f9e7b96b37218ed7230c3b5a62706450cc59d7eecc45b14a25f62d85","last_reissued_at":"2026-05-18T02:04:11.728001Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:04:11.728001Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Parity violation in the Cosmic Microwave Background from a pseudoscalar inflaton","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ph","hep-th"],"primary_cat":"astro-ph.CO","authors_text":"Lorenzo Sorbo","submitted_at":"2011-01-07T21:04:03Z","abstract_excerpt":"If the inflaton is a pseudoscalar, then it naturally interacts with gauge fields via an axion-like coupling to $F_{\\mu\\nu} \\tilde{F}^{\\mu\\nu}$. 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