Hydrodynamic Origin of the 4.8 keV Migdal Effect Signal

Hydrodynamic Origin of the 4.8 keV Migdal Effect Signal | 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PDF Article Hydrodynamic Origin of the 4.8 keV Migdal Effect Signal Alexander Shlyapik This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8950310/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 Recent detection of a 5.01-sigma Migdal effect signal (UCAS, January 2026) revealed a mysterious 4.8 keV particle. Here we demonstrate that this signal is not a standalone dark matter candidate, but a localized excitation of a universal viscous fermion condensate (psi-field). By integrating laboratory data with astrophysical observations from XRISM and Chandra (6.2-sigma resonance), we show that the 4.8 keV mass dictates the cosmic viscosity (eta = 1.2e-15 Pa-s). This framework provides a single-parameter solution to the Hubble (H0) and S8 tensions, identifying the 4.8 keV fermion as the fundamental constituent of the space-time medium. Physical sciences/Physics/Fluid dynamics Physical sciences/Physics/Astronomy and astrophysics/Dark energy and dark matter Full Text Additional Declarations There is NO Competing Interest. 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. 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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-8950310","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":598423828,"identity":"cceb680e-5652-4ac5-883b-8e23da4bf761","order_by":0,"name":"Alexander Shlyapik","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA+ElEQVRIiWNgGAWjYBACAyjJIwGiE37YAEnGxgPEa3nYkwbS0kCEFiAAaWF8wHYYzMGrxZy999mDDwXbZCTbzxg+SOA5b7e2/TDQlhqbaFxaLHuOmxvOMLjNI82TY2yQYHE7eduZRKCWY2m5DbgcdiONTZoHqEWOIS1NIoHndrLZAaAWxobDuLXcfwbVwv8MqIXtXLLZ+YcEtNxgg2iRlkg+BtRywM7sBiFbzqSxg/0iOePxYYPEnuQEsxtAWxLw+eX4MbYHH/7ctpc4n9j48McPO3uz8+kPH3yoscGpBQjYUHiJYJUJuJVjarHHr3gUjIJRMApGIgAAcLphcXMQ3AEAAAAASUVORK5CYII=","orcid":"https://orcid.org/0009-0003-7726-109X","institution":"Independent Researcher","correspondingAuthor":true,"prefix":"","firstName":"Alexander","middleName":"","lastName":"Shlyapik","suffix":""}],"badges":[],"createdAt":"2026-02-23 19:50:31","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-8950310/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-8950310/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":103798795,"identity":"ffa77550-e9c8-42d5-9940-55ba879c03b8","added_by":"auto","created_at":"2026-03-03 05:14:32","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":221493,"visible":true,"origin":"","legend":"","description":"","filename":"HydrodynamicInterpretationofthe4.8keVMigdalEffectSignalasaViscousFermionCondensate.pdf","url":"https://assets-eu.researchsquare.com/files/rs-8950310/v1_covered_1ba79ccd-fbf9-4d5a-a4a8-d0b77da3cbb0.pdf"}],"financialInterests":"There is \u003cb\u003eNO\u003c/b\u003e Competing Interest.","formattedTitle":"Hydrodynamic Origin of the 4.8 keV Migdal Effect Signal","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":true,"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":"","lastPublishedDoi":"10.21203/rs.3.rs-8950310/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-8950310/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"Recent detection of a 5.01-sigma Migdal effect signal (UCAS, January 2026) revealed a mysterious 4.8 keV particle. 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