Constraints on DBI dark energy with chameleon mechanism

Constraints on DBI dark energy with chameleon mechanism | 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on DBI dark energy with chameleon mechanism Burin Gumjudpai, Nandan Roy, John Ward This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7955676/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 In this work, we investigate the Dirac–Born–Infeld chameleon scalar field model in light of the latest cosmological observations, analyzing the model both with the incorporation of the chameleon mechanism and without it. Results from current cosmological observations, such as Pantheon Plus, DES Y5, DESI DR2, and the compressed Planck likelihood, are used to constrain the model. We consider the AdS throat in the form of f (ϕ) = λ/ϕ4 and a potential V (ϕ) = m0 2ϕ 2 + m1 2 ϕ4 .One interesting finding from our analysis is that, without the chameleon mechanism, the mean value of m1 ≃ 0 indicates the self-interaction of the DBI field could potentially be negligible. Constraints on the potential parameters do not appear when considering the chameleon mechanism, but the warp parameter and chameleon coupling parameter are forced to satisfy η ≥ 0 and β ≤ 0. Different choices of β render the same background cosmological parameters. The equation of state wDE resides more in the quintessence region in the past. There is no phantom crossing in this model under our assumption of the warp throat and potential. By computing the ∆AIC relative to the ΛCDM model, we study statistical model comparison. The model as a candidate of dynamical dark energy is observationally viable at the cosmological background level. 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-7955676","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":540279106,"identity":"f40d902d-f541-4ae7-9ff1-2a766b65f583","order_by":0,"name":"Burin Gumjudpai","email":"","orcid":"","institution":"NAS, Mahidol University","correspondingAuthor":false,"prefix":"","firstName":"Burin","middleName":"","lastName":"Gumjudpai","suffix":""},{"id":540279107,"identity":"2d96001f-98bd-42fa-b70e-a02ea69dc1e5","order_by":1,"name":"Nandan Roy","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA/klEQVRIiWNgGAWjYJACCQjFfICBsUGCsYEdwk0gQgtbAkQLM5hnQIwWHgOgFgbCWszZzx688XMHQz6/RM7XDT93WMj2MzMwfvjB8CcPlxbLnrxky94zDJYzZ+Ruu9l7RsJ4ZjMDs2QPg0ExLi0GB3LMJHjbGAwMbuRuu8HbJpG44TADgzRQIrEBl5bzb8wk/4K15Dy7+Reihfk3Xi03csykIbbksN2G2sKG35Ybb4ytZdskDCR7npndBjKAfmFss+wxMMbjsBzDm2/bbAz42ZOfARl1sv3szYdv/KiQw6kFCoBRI5AA4wBjh8EAv3oI4D9AjKpRMApGwSgYiQAAmctWgMg3Qo8AAAAASUVORK5CYII=","orcid":"","institution":"NAS, Mahidol University","correspondingAuthor":true,"prefix":"","firstName":"Nandan","middleName":"","lastName":"Roy","suffix":""},{"id":540279108,"identity":"5fd3e5c5-f9f5-4c59-8cd7-77b4e13c1b49","order_by":2,"name":"John Ward","email":"","orcid":"","institution":"Arbutus Studios","correspondingAuthor":false,"prefix":"","firstName":"John","middleName":"","lastName":"Ward","suffix":""}],"badges":[],"createdAt":"2025-10-27 11:41:00","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-7955676/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-7955676/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":95911483,"identity":"b2c2e49c-82dd-4d1e-8daa-96ef4f9363b2","added_by":"auto","created_at":"2025-11-14 10:37:02","extension":"json","order_by":0,"title":"","display":"","copyAsset":false,"role":"acdc-reference","size":4628,"visible":true,"origin":"","legend":"","description":"","filename":"485d30228350436983169ca4795ee9a0.json","url":"https://assets-eu.researchsquare.com/files/rs-7955676/v1/39fbcf06de4d95fd9fd0fc90.json"},{"id":108807166,"identity":"6802648a-b4bf-4fcb-8648-d6ecab74d69a","added_by":"auto","created_at":"2026-05-08 15:30:14","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":1886580,"visible":true,"origin":"","legend":"","description":"","filename":"DBIchameleo.pdf","url":"https://assets-eu.researchsquare.com/files/rs-7955676/v1_covered_60b57af0-974c-47cc-96da-1837206e1f0e.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Constraints on DBI dark energy with chameleon mechanism","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":"","lastPublishedDoi":"10.21203/rs.3.rs-7955676/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-7955676/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":" In this work, we investigate the Dirac–Born–Infeld chameleon scalar field model in light of the latest cosmological observations, analyzing the model both with the incorporation of the chameleon mechanism and without it. Results from current cosmological observations, such as Pantheon Plus, DES Y5, DESI DR2, and the compressed Planck likelihood, are used to constrain the model. We consider the AdS throat in the form of f (ϕ) = λ/ϕ4 and a potential V (ϕ) = m0 2ϕ 2 + m1 2 ϕ4 .One interesting finding from our analysis is that, without the chameleon mechanism, the mean value of m1 ≃ 0 indicates the self-interaction of the DBI field could potentially be negligible. Constraints on the potential parameters do not appear when considering the chameleon mechanism, but the warp parameter and chameleon coupling parameter are forced to satisfy η ≥ 0 and β ≤ 0. Different choices of β render the same background cosmological parameters. The equation of state wDE resides more in the quintessence region in the past. There is no phantom crossing in this model under our assumption of the warp throat and potential. By computing the ∆AIC relative to the ΛCDM model, we study statistical model comparison. The model as a candidate of dynamical dark energy is observationally viable at the cosmological background level.","manuscriptTitle":"Constraints on DBI dark energy with chameleon mechanism","msid":"","msnumber":"","nonDraftVersions":[{"code":1,"date":"2025-11-14 10:36:57","doi":"10.21203/rs.3.rs-7955676/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":"e8fcd8eb-0622-404c-b728-6b5745d40e8e","owner":[],"postedDate":"November 14th, 2025","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[],"tags":[],"updatedAt":"2026-05-08T11:57:01+00:00","versionOfRecord":[],"versionCreatedAt":"2025-11-14 10:36:57","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v1","identity":"rs-7955676","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-7955676","identity":"rs-7955676","version":["v1"]},"buildId":"XKTyCvWXoU3ODBz1xrDgd","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}