Emergent Quantum Dynamics from Interacting Semiclassical Universes with Variable Gravitational Coupling

Emergent Quantum Dynamics from Interacting Semiclassical Universes with Variable Gravitational Coupling | 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 Emergent Quantum Dynamics from Interacting Semiclassical Universes with Variable Gravitational Coupling Andrew Kiruluta This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8522502/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 propose a covariant multiverse framework in which quantum phenomena arise effectively for observers restricted to a single semiclassical universe. Each universe is endowed with a classical Lorentzian metric and a scalar--tensor sector that realizes a spacetime- and age-dependent gravitational coupling \(G(x,\tau)\), where \(\tau\) is a cosmic-age scalar defined with respect to a preferred cosmological congruence. Inter-universe interactions are modeled by proximity-weighted couplings that permit coherent amplitude exchange between nearby universes and by stochastic sector events that induce transitions and decoherence. For an observer in a given universe, tracing over the remaining sectors yields a reduced, open-system description that is linear and completely positive in the weak-coupling/Markovian regime, providing an explicit route to Lindblad-type generators. Metric superpositions are excluded within each universe by construction; apparent ``superpositions of geometries'' are instead identified with coherence over universe labels, with a definite classical geometry in every sector. We relate this construction to Many-Interacting-Worlds models, semiclassical and stochastic gravity, and standard open-quantum-systems techniques, and we outline phenomenological constraints from bounds on \(\dot G/G\) and proposed gravitationally mediated entanglement tests. We outline concrete next steps, including toy-model demonstrations of interference and tunneling, parameterization of scalar–tensor functions consistent with Solar-System bounds, and quantitative predictions for gravitationally mediated entanglement experiments. We supplement the conceptual framework with quantitative toy-model demonstrations (qutrit and oscillator), including plots of coherence $C_{01}(t)$, purity $\mathcal{P}(t)$, and interferometric visibility $\mathcal{V}(t)$, and we illustrate departures from Markovian LGKS dynamics via time-dependent rates in a non-Markovian variant. Astrophysics and Cosmology 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-8522502","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":569635820,"identity":"b9f2ec18-c56a-4e6c-b24b-d1b9e92729bc","order_by":0,"name":"Andrew Kiruluta","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAABBklEQVRIiWNgGAWjYHACAxDBDOPJgYgDD0jRYgzWkkCEFjhIbACR+LTwz27e9uFjGwM7v/Tho5t5GLalzw87/BBoi52cbgN2LRJ3jhXPnNnGwCzZl5Z2m4fhdu7G22kGQC3JxmYHcFhzI8eYmXcbA7PBGR4ziJbZCSAtBxK34dAiD9LyF6jF/gz/N5CWdMPZ6R/wajEAaWEE2cLDwwbSkiAvnYPfFsMbacWMvf8kmCXOsJndnGNw23CDdE7BgQQD3H6Ru5G8meHHGZtk/h7mZzfeVNyWl5+dvvnDhwo7OZzehwCJZBDJxAOMIwOwSgO8ysHADkQw/gAS8g2EVY+CUTAKRsHIAgAa7F4YIGA+yAAAAABJRU5ErkJggg==","orcid":"https://orcid.org/0009-0002-2042-5009","institution":"UC Berkeley","correspondingAuthor":true,"prefix":"","firstName":"Andrew","middleName":"","lastName":"Kiruluta","suffix":""}],"badges":[],"createdAt":"2026-01-05 14:38:22","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-8522502/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-8522502/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":99799074,"identity":"6738c2a7-1531-4a55-8460-78c45fcbc66f","added_by":"auto","created_at":"2026-01-08 13:49:13","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":711144,"visible":true,"origin":"","legend":"","description":"","filename":"QMGR.pdf","url":"https://assets-eu.researchsquare.com/files/rs-8522502/v1_covered_8f2ebfde-7a8e-4e4e-b147-349fc7198805.pdf"}],"financialInterests":"The authors declare no competing interests.","formattedTitle":"\u003cp\u003eEmergent Quantum Dynamics from Interacting Semiclassical Universes with Variable Gravitational Coupling\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":"","lastPublishedDoi":"10.21203/rs.3.rs-8522502/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-8522502/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eWe propose a covariant multiverse framework in which quantum phenomena arise effectively for observers restricted to a single semiclassical universe. Each universe is endowed with a classical Lorentzian metric and a scalar--tensor sector that realizes a spacetime- and age-dependent gravitational coupling \\(G(x,\\tau)\\), where \\(\\tau\\) is a cosmic-age scalar defined with respect to a preferred cosmological congruence. Inter-universe interactions are modeled by proximity-weighted couplings that permit coherent amplitude exchange between nearby universes and by stochastic sector events that induce transitions and decoherence. For an observer in a given universe, tracing over the remaining sectors yields a reduced, open-system description that is linear and completely positive in the weak-coupling/Markovian regime, providing an explicit route to Lindblad-type generators. Metric superpositions are excluded within each universe by construction; apparent ``superpositions of geometries'' are instead identified with coherence over universe labels, with a definite classical geometry in every sector. 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