Semiclassical Determination of ΩΛ from Standard Model Horizon Loading

Semiclassical Determination of ΩΛ from Standard Model Horizon Loading | 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Article Semiclassical Determination of Ω Λ from Standard Model Horizon Loading Robert Mereau This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8682178/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 The cosmological constant problem—QFT vacuum energy exceeding observations by —remains unsolved without fine-tuning or anthropics. We present a semiclassical determination of from Standard Model field content on a spherical cosmological horizon. Under a small set of discrete modeling assumptions (M1–M4), we project Standard Model fields onto the monopole () block of a spherical horizon at radius , apply Kubo-Martin-Schwinger (KMS) thermal weighting at the Gibbons-Hawking temperature , and use symmetry-fixed greybody factors. All boundary terms vanish by gauge/color/parity symmetries, with a geometric heat-kernel correction for bosons. The calculation yields a dimensionless loading , which maps to via a geometric normalization fixed by the causal diamond solid angle. Comparison with DESI 2024 + CMB data shows agreement within . Every coefficient derives from Standard Model structure, spherical geometry, or thermal physics—no uncanceled UV divergences or fitted continuous parameters under assumptions M1–M4. Astrophysics and Cosmology cosmological constant dark energy horizon thermodynamics Standard Model semiclassical gravity heat kernel KMS thermal state Full Text Additional Declarations The authors declare no competing interests. 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-8682178","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":579556532,"identity":"e325a86d-7558-4f8e-9ecc-e4fca315acd6","order_by":0,"name":"Robert Mereau","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA4ElEQVRIiWNgGAWjYPACGwYDZiDF2MAgA+IeIEJLGlALM1gLD7FaDjMYMCBpwQt023sfPvjZdj5xOzv/wce8O+x4+BmYH+K1xezMcWPD3rbbiTubmZmNec8k80g2sBng13IjjU2Ct+127obDzGzSuW3MPED1BLTcf8b+82/bOZAW9t+5bfU89gfYPxCwhY2NmbftANgW5ty2wzwGDDwEbDmTxiwtcy65HqjFWPpv23EeicM8Bfi1HD/G+PFNmZ2xwfmDDz/ObKuW429v3/wBnxYsgJlE9aNgFIyCUTAKMAEA/m9Kkkz5fawAAAAASUVORK5CYII=","orcid":"https://orcid.org/0009-0004-6576-5028","institution":"","correspondingAuthor":true,"prefix":"","firstName":"Robert","middleName":"","lastName":"Mereau","suffix":""}],"badges":[],"createdAt":"2026-01-23 19:48:25","currentVersionCode":1,"declarations":{"humanSubjects":false,"vertebrateSubjects":false,"conflictsOfInterestStatement":false,"humanSubjectEthicalGuidelines":false,"humanSubjectConsent":false,"humanSubjectClinicalTrial":false,"humanSubjectCaseReport":false,"vertebrateSubjectEthicalGuidelines":false},"doi":"10.21203/rs.3.rs-8682178/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-8682178/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":101297669,"identity":"1b8b90e7-3284-4454-aefd-55976c39027f","added_by":"auto","created_at":"2026-01-28 09:28:30","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":278300,"visible":true,"origin":"","legend":"","description":"","filename":"SemiclassicalOmegaLambdaSMHorizon1.pdf","url":"https://assets-eu.researchsquare.com/files/rs-8682178/v1_covered_b289f8bd-2b2f-4476-a85f-115e78dceded.pdf"}],"financialInterests":"The authors declare no competing interests.","formattedTitle":"\u003cp\u003eSemiclassical Determination of Ω\u003csub\u003eΛ\u003c/sub\u003e from Standard Model Horizon Loading\u003c/p\u003e","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":"cosmological constant, dark energy, horizon thermodynamics, Standard Model, semiclassical gravity, heat kernel, KMS thermal state","lastPublishedDoi":"10.21203/rs.3.rs-8682178/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-8682178/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eThe cosmological constant problem—QFT vacuum energy exceeding observations by —remains unsolved without fine-tuning or anthropics. We present a semiclassical determination of \u0026nbsp;from Standard Model field content on a spherical cosmological horizon. Under a small set of discrete modeling assumptions (M1–M4), we project Standard Model fields onto the monopole () block of a spherical horizon at radius , apply Kubo-Martin-Schwinger (KMS) thermal weighting at the Gibbons-Hawking temperature , and use symmetry-fixed greybody factors. All boundary terms vanish by gauge/color/parity symmetries, with a geometric heat-kernel correction for bosons. The calculation yields a dimensionless loading , which maps to \u0026nbsp;via a geometric normalization fixed by the causal diamond solid angle. Comparison with DESI 2024 + CMB data \u0026nbsp;shows agreement within . 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