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While the existence of a PMF is still hypothetical, there will certainly be a contribution to CMB FR from the magnetic field of the Milky Way. We use existing estimates of the Milky Way rotation measure (RM) to forecast its detectability with upcoming and future CMB experiments. We find that the galactic RM will not be seen in polarization measurements by Planck, but that it will need to be accounted for by CMB exp"},"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":"1305.7225","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2013-05-30T19:59:26Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"3b5e33a6df9725b509f5645bbc9cbfb83112fa254a1db5634c34fb8d89629b80","abstract_canon_sha256":"fe4acce356b4fb56bf440b1ec260d93870897fd2080588c68b6e9e0ab737d35b"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:11:46.570354Z","signature_b64":"rxWsBOx+RGLIDQiFaRFP2gpmKZ1nbvVNIZ47MZUCoqczutHCuw1uCkZxgNvMOhe4G+YuvvfGjMkMv6d2e4WhAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ba55d581c1c315843ea3c5d3fbfbce93426feb73d6d289dbcd3a731068f13084","last_reissued_at":"2026-05-18T03:11:46.569705Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:11:46.569705Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"CMB Faraday rotation as seen through the Milky Way","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.CO","authors_text":"Levon Pogosian, Soma De, Tanmay Vachaspati","submitted_at":"2013-05-30T19:59:26Z","abstract_excerpt":"Faraday Rotation (FR) of CMB polarization, as measured through mode-coupling correlations of E and B modes, can be a promising probe of a stochastic primordial magnetic field (PMF). 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