Interplay between Swampland and Bayesian Machine Learning in constraining cosmological models

Abstract

Constraints on a dark energy dominated Universe are obtained from an interplay between Bayesian Machine Learning and string Swampland criteria. The approach here differs from previous studies, since in the generative process Swampland criteria are used and, only later, the results of the fit are validated, by using observational data-sets. A generative process based Bayesian Learning approach is applied to two models and the results are validated by means of available $H(z)$ data. For the first model, a parametrization of the Hubble constant is considered and, for the second, a parametrization of the deceleration parameter. This study is motivated by a recent work, where constraints on string Swampland criteria have been obtained from a Gaussian Process and $H(z)$ data. However, the results obtained here are fully independent of the observational data and allow to estimate how the high-redshift behavior of the Universe will affect the low-redshift one. Moreover, both parameterizations in the generative process, for the Hubble and for the deceleration parameters, are independent of the dark energy model. The outcome, both data- and dark energy model-independent, may highlight, in the future, the borders of the Swampland for the low-redshift Universe and help to develop new string-theory motivated dark-energy models. The string Swampland criteria considered might be in tension with recent observations indicating that phantom dark energy cannot be in the Swampland. Finally, a spontaneous sign switch in the dark energy equation of state parameter is observed when the field traverses are in the $z\in [0,5]$ redshift range, a remarkable phenomenon requiring further analysis.

arXiv comment12 pages, 4 figures, 2 tables

References in corpus (44)

• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• de Sitter Vacua in String Theory
• Modified Gravity Theories on a Nutshell: Inflation, Bounce and Late-time Evolution
• On the Geometry of the String Landscape and the Swampland
• Supergravity description of field theories on curved manifolds and a no go theorem
• Systematics of Moduli Stabilisation in Calabi-Yau Flux Compactifications
• Distance and de Sitter Conjectures on the Swampland
• Non-minimal dark sector physics and cosmological tensions
• Bounds on Slow Roll and the de Sitter Swampland
• LambdaCDM epoch reconstruction from F(R,G) and modified Gauss-Bonnet gravities
• Early dark energy from massive neutrinos -- a natural resolution of the Hubble tension
• Reconstructing the universe history, from inflation to acceleration, with phantom and canonical scalar fields
• The landscape, the swampland and the era of precision cosmology
• Inflationary Constraints on Type IIA String Theory
• de Sitter String Vacua from Kahler Uplifting
• Swampland Implications of GW170817-compatible Einstein-Gauss-Bonnet Gravity
• Structure formation in $f(T)$ gravity and a solution for $H_0$ tension
• Dark Energy in the Swampland
• Explicit de Sitter Flux Vacua for Global String Models with Chiral Matter
• Towards de Sitter from 10D
• Model-independent reconstruction of $f(T)$ gravity from Gaussian Processes
• Micromanaging de Sitter holography
• Flux moduli stabilisation, Supergravity algebras and no-go theorems
• A sufficient condition for de Sitter vacua in type IIB string theory
• Constraining de Sitter Space in String Theory
• de Sitter Swampland, $H_0$ tension & observation
• Observational constraints on the acceleration of the Universe
• Stability Constraints on Classical de Sitter Vacua
• Moduli Stabilization and Cosmology of Type IIB on SU(2)-Structure Orientifolds
• Unifying inflation with dark energy in modified F(R) Horava-Lifshitz gravity
• Constraints on String Cosmology
• Test of the cosmic evolution using Gaussian processes
• Dark energy beyond quintessence: Constraints from the swampland
• Refining the boundaries of the classical de Sitter landscape
• On Cosmological Constants from alpha'-Corrections
• An analysis of the $H_0$ tension problem in a universe with a viscous dark fluid
• Tachyons in Classical de Sitter Vacua
• Swampland criteria for a dark-energy dominated universe, ensuing from Gaussian process and H(z) data analysis
• Accelerated Universes from type IIA Compactifications
• Hints of dark energy anisotropic stress using Machine Learning
• $H_0$ tension and the String Swampland
• Multi-field Inflation in High-Slope Potentials
• Emergent Dark Universe and the Swampland Criteria
• Model-Independent Perspectives on Coupled Dark Energy and the Swampland

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• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme