Addressing the Hubble and $S_8$ Tensions with a Kinetically Mixed Dark Sector

Abstract

We present a kinetically mixed dark sector (KMIX) model to address the Hubble and $S_8$ tensions. Inspired from string theory, our model includes two fields: an axion, which plays a role similar to the scalar field in early dark energy models, and a dilaton. This theory differs from other axio-dilaton models aimed at the Hubble tension in that there is necessarily kinetic mixing between the two fields which allows for efficient energy transfer from the axion into the dilaton which has $w\approx 1$. As a direct consequence of these dynamics, we find the model does not need to resort to a fine-tuned potential to solve the Hubble tension and naturally accommodates a standard axion potential. Furthermore, the axion will necessarily makeup a small (fuzzy) fraction of ${\Omega }_{\mathrm{cdm}}$ once it begins to oscillate at the bottom of its potential and will suppress the growth of perturbations on scales sensitive to $S_8$. Interestingly, the scale of the potential for the dilaton has to be small, $\lesssim \mathcal{O}(10\mathrm{meV}{)}^4$, suggesting the possibility for a connection to dark energy. Implementing the dynamics for the background and perturbations in a modified Boltzmann code we calculate the CMB and matter power spectra for our theory. Exploring the parameter space of our model, we find regions which can accommodate a $\sim 10\%$ increase in $H_0$ from the Planck inferred value and $S_8$ values that are consistent with large-scale structure constraints.

arXiv comment22 pages, 5 figures, replaced with version accepted for publication in JCAP

References in corpus (65)

• A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team
• The Cosmic Linear Anisotropy Solving System (CLASS) II: Approximation schemes
• In the Realm of the Hubble tension $-$ a Review of Solutions
• Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
• String Axiverse
• Cosmological Perturbation Theory in the Synchronous vs. Conformal Newtonian Gauge
• Cosmological Perturbation Theory in the Synchronous and Conformal Newtonian Gauges
• Axions In String Theory
• The String Landscape, Black Holes and Gravity as the Weakest Force
• On the Geometry of the String Landscape and the Swampland
• Dark Energy Survey Year 3 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
• Tensions between the Early and the Late Universe
• Early Dark Energy Can Resolve The Hubble Tension
• Four-dimensional String Compactifications with D-Branes, Orientifolds and Fluxes
• Flux compactifications in string theory: a comprehensive review
• KiDS-1000 Cosmology: Cosmic shear constraints and comparison between two point statistics
• Cosmology from cosmic shear power spectra with Subaru Hyper Suprime-Cam first-year data
• The Cosmic Linear Anisotropy Solving System (CLASS) I: Overview
• The type IIB string axiverse and its low-energy phenomenology
• The $H_0$ Olympics: A fair ranking of proposed models
• A search for ultra-light axions using precision cosmological data
• Structure Formation with Generalized Dark Matter
• Calibration of the Tip of the Red Giant Branch (TRGB)
• Dark Energy Survey Year 3 Results: Cosmology from Cosmic Shear and Robustness to Modeling Uncertainty
• Early dark energy, the Hubble-parameter tension, and the string axiverse
• Oscillating scalar fields and the Hubble tension: a resolution with novel signatures
• Early Dark Energy Does Not Restore Cosmological Concordance
• The Hubble Constant: A Summary of the HST Program for the Luminosity Calibration of Type Ia Supernovae by Means of Cepheids
• Cosmological implications of ultra-light axion-like fields
• Early dark energy from massive neutrinos -- a natural resolution of the Hubble tension
• Acoustic Dark Energy: Potential Conversion of the Hubble Tension
• Constraining Early Dark Energy with Large-Scale Structure
• Is the Hubble tension a hint of AdS phase around recombination?
• New Early Dark Energy
• Hubble Space Telescope Observations of Mira Variables in the Type Ia Supernova Host NGC 1559: An Alternative Candle to Measure the Hubble Constant
• Consistency tests of $\Lambda$CDM from the early integrated Sachs-Wolfe effect: Implications for early-time new physics and the Hubble tension
• Dark Matter from an ultra-light pseudo-Goldsone-boson
• Arbitrating the $S_8$ discrepancy with growth rate measurements from Redshift-Space Distortions
• Ultra-Light Scalar Fields and the Growth of Structure in the Universe
• Early dark energy is not excluded by current large-scale structure data
• The Hubble Tension in Light of the Full-Shape Analysis of Large-Scale Structure Data
• The Atacama Cosmology Telescope: Constraints on Pre-Recombination Early Dark Energy
• New constraint on Early Dark Energy from Planck and BOSS data using the profile likelihood
• Unified framework for Early Dark Energy from $\alpha$-attractors
• Axion as a Cold Dark Matter candidate
• Thermal Friction as a Solution to the Hubble Tension
• Axion-Dilaton Destabilization and the Hubble Tension
• Restoring cosmological concordance with early dark energy and massive neutrinos?
• A Step in Understanding the Hubble Tension
• Dark Sector to Restore Cosmological Concordance
• Early mass varying neutrino dark energy: Nugget formation and Hubble anomaly
• Heterotic Moduli Stabilisation
• The Early Dark Sector, the Hubble Tension, and the Swampland
• Resolving the $H_0$ tension with diffusion
• Axion Monodromy Inflation on Warped Throats
• Chain Early Dark Energy: Solving the Hubble Tension and Explaining Today's Dark Energy
• Fuzzy Dark Matter Candidates from String Theory
• Closing the window on fuzzy dark matter with the 21cm signal
• Yoga Dark Energy: Natural Relaxation and Other Dark Implications of a Supersymmetric Gravity Sector
• Observable Chiral Gravitational Waves from Inflation in String Theory
• Thraxions: Ultralight Throat Axions
• Thermal Friction as a Solution to the Hubble and Large-Scale Structure Tensions
• On The Warped Heterotic Axion
• Altered Axion Abundance from a Dynamical Peccei-Quinn Scale
• Towards a Dark Sector Model from String Theory

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• Ultra-light axions and the $S_8$ tension: joint constraints from the cosmic microwave background and galaxy clustering
• Observational constraints on early dark energy
• Cold New Early Dark Energy pulls the trigger on the $H_0$ and $S_8$ tensions: a simultaneous solution to both tensions without new ingredients
• A Dark Matter Trigger for Early Dark Energy Coincidence
• Early Dark Energy in Type IIB String Theory
• Kinetically Coupled Scalar Fields Model and Cosmological Tensions
• Does the fraction of dark matter diminish with early dark energy?
• Forecasts for interacting dark energy with time-dependent momentum exchange
• The Hubble tension from the standpoint of quantum cosmology
• Cosmological constraints on mass-varying dark matter