Constraints on large-scale CMB EB correlations from Planck polarization

Constraints on large-scale CMB EB correlations from Planck polarization | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Constraints on large-scale CMB EB correlations from Planck polarization Vernando Simbolon This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8606300/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract We analyze large-scale parity-odd \((EB)\) correlations in the cosmic microwave background using Planck 2018 polarization data. Employing the SMICA component-separated maps, conservative sky masking, and Monte Carlo null simulations, we find no statistically significant deviation from the parity-symmetric expectation. From the null distribution, we place a two-sided 95% confidence-level upper bound on the magnitude of coherent, multipole-averaged correlations on large angular scales, \((|\EBavg| < 1.04 \times 10^{-12}\,\mu{\rm K}^2)\) for \((2 \le \ell \le 30)\) . These results provide robust, model-independent null limits on parity-odd correlations in the largest-scale CMB polarization field. The analysis serves as a conservative benchmark for large-scale EB null tests relevant to current and future CMB polarization experiments. Cosmic microwave background CMB polarization parity-odd correlations EB power spectrum null tests large angular scales Planck data Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-8606300","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":583516338,"identity":"99de1250-c74c-4d57-931d-39a7be84f1dd","order_by":0,"name":"Vernando Simbolon","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAABDUlEQVRIiWNgGAWjYDACZgY2BoYCBJ+xH0QmFOBSD9NigKRlZgNIiwEu9WCApmXDARCFR4t8O3fagw8GNnkMEsnHPhfU3JHdfH514ocHBgzy/GIHsGoxOMy73XCGQVoxg0Ra8uwZx54Zb7vxdrME0GGGM2cnYNfCzLtNmsfgcGIDzxljZh62w4nbbpzdANKSYHAbuxb5ZriW85+Zef4dTtw84+zmH/i0MByGaWHvYWbmbTucuIG/dxteW2B+SWxjbzNm5u07bDzjBu82iwQDCZx+ke8/u+3BhwqbxH5m5sfMPN8Oy/b3n91880eFjTy/NA6HwQAbnCUBVimBXzkq4D9AiupRMApGwSgYAQAADfVdWsR03mMAAAAASUVORK5CYII=","orcid":"","institution":"","correspondingAuthor":true,"prefix":"","firstName":"Vernando","middleName":"","lastName":"Simbolon","suffix":""}],"badges":[],"createdAt":"2026-01-15 03:08:12","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-8606300/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-8606300/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":105058945,"identity":"93980590-8b56-4e2d-8ee3-3bd5cd5ec0a4","added_by":"auto","created_at":"2026-03-20 12:12:03","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":256766,"visible":true,"origin":"","legend":"","description":"","filename":"submission.pdf","url":"https://assets-eu.researchsquare.com/files/rs-8606300/v1_covered_b62059dc-09cc-4aa6-9088-1c5b64e3ccbe.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Constraints on large-scale CMB EB correlations from Planck polarization","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"Cosmic microwave background, CMB polarization, parity-odd correlations, EB power spectrum, null tests, large angular scales, Planck data","lastPublishedDoi":"10.21203/rs.3.rs-8606300/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-8606300/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eWe analyze large-scale parity-odd \u003cspan class=\"InlineEquation\"\u003e\u003cspan class=\"mathinline\"\u003e\\((EB)\\)\u003c/span\u003e\u003c/span\u003e correlations in the cosmic microwave background using Planck 2018 polarization data. Employing the SMICA component-separated maps, conservative sky masking, and Monte Carlo null simulations, we find no statistically significant deviation from the parity-symmetric expectation. From the null distribution, we place a two-sided 95% confidence-level upper bound on the magnitude of coherent, multipole-averaged correlations on large angular scales, \u003cspan class=\"InlineEquation\"\u003e\u003cspan class=\"mathinline\"\u003e\\((|\\EBavg| \u0026lt; 1.04 \\times 10^{-12}\\,\\mu{\\rm K}^2)\\)\u003c/span\u003e\u003c/span\u003e for \u003cspan class=\"InlineEquation\"\u003e\u003cspan class=\"mathinline\"\u003e\\((2 \\le \\ell \\le 30)\\)\u003c/span\u003e\u003c/span\u003e. These results provide robust, model-independent null limits on parity-odd correlations in the largest-scale CMB polarization field. The analysis serves as a conservative benchmark for large-scale EB null tests relevant to current and future CMB polarization experiments.\u003c/p\u003e","manuscriptTitle":"Constraints on large-scale CMB EB correlations from Planck polarization","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2026-02-23 03:01:17","doi":"10.21203/rs.3.rs-8606300/v1","editorialEvents":[{"type":"communityComments","content":0}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"21e12d6e-0601-4391-b860-b1a9449442b9","owner":[],"postedDate":"February 23rd, 2026","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[],"tags":[],"updatedAt":"2026-03-20T12:11:03+00:00","versionOfRecord":[],"versionCreatedAt":"2026-02-23 03:01:17","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-8606300","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-8606300","identity":"rs-8606300","version":["v1"]},"buildId":"XKTyCvWXoU3ODBz1xrDgd","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}