Null test for interactions in the dark sector

Abstract

Since there is no known symmetry in Nature that prevents a non-minimal coupling between the dark energy (DE) and cold dark matter (CDM) components, such a possibility constitutes an alternative to standard cosmology, with its theoretical and observational consequences being of great interest. In this paper we propose a new null test on the standard evolution of the dark sector based on the time dependence of the ratio between the CDM and DE energy densities which, in the standard $\Lambda$CDM scenario, scales necessarily as $a^{-3}$. We use the latest measurements of type Ia supernovae, cosmic chronometers and angular baryonic acoustic oscillations to reconstruct the expansion history using model-independent Machine Learning techniques, namely, the Linear Model formalism and Gaussian Processes. We find that while the standard evolution is consistent with the data at $3\sigma$ level, some deviations from the $\Lambda$CDM model are found at low redshifts, which may be associated with the current tension between local and global determinations of $H_0$.

15 pages, 12 figures

References in corpus (9)

• Dynamics of dark energy
• Raising the bar: new constraints on the Hubble parameter with cosmic chronometers at z$\sim$2
• Aspects of the cosmological "coincidence problem"
• Dynamics of interacting dark energy
• Nonparametric Dark Energy Reconstruction from Supernova Data
• Tracing The Sound Horizon Scale With Photometric Redshift Surveys
• CMB and matter power spectra with non-linear dark-sector interactions
• Reconstruction of cosmological matter perturbations in Modified Gravity
• Interactions in the dark sector of the Universe

Cited by in corpus (33)

• Late universe decaying dark matter can relieve the H_0 tension
• Nonlinear interacting cosmological models after Planck 2018 legacy release and the $H_0$ tension
• Listening to the sound of dark sector interactions with gravitational wave standard sirens
• What can Machine Learning tell us about the background expansion of the Universe?
• Cosmological constraints on late-universe decaying dark matter as a solution to the $H_0$ tension
• Constraints on interacting dark energy models through cosmic chronometers and Gaussian process
• Dark degeneracy I: Dynamical or interacting dark energy?
• Novel null tests for the spatial curvature and homogeneity of the Universe and their machine learning reconstructions
• Neural Network Reconstruction of Late-Time Cosmology and Null Tests
• Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
• Reconstruction of the dark sectors' interaction: A model-independent inference and forecast from GW standard sirens
• Evidence for cosmic acceleration with next-generation surveys: A model-independent approach
• A model-independent reconstruction of dark sector interactions
• Euclid: Forecast constraints on consistency tests of the $\Lambda$CDM model
• Possible Hints of Sterile Neutrinos in Recent Measurements of the Hubble Parameter
• The Hubble constant tension with next-generation galaxy surveys
• Stability analysis and constraints on interacting viscous cosmology
• Inferring galaxy dark halo properties from visible matter with Machine Learning
• Kinematic Constraints on Spatial Curvature from Supernovae Ia and Cosmic Chronometers
• Improved null tests of $\Lambda$CDM and FLRW in light of DESI DR2
• A test of the standard dark matter density evolution law using galaxy clusters and cosmic chronometers
• Testing the $\Lambda$CDM paradigm with growth rate data and machine learning
• An estimate of the dark matter density from galaxy clusters and supernovae data
• One-parameter dynamical dark-energy from the generalized Chaplygin gas
• J-PLUS DR3: Galaxy-Star-Quasar classification
• Probing the dark matter density evolution law with large scale structures
• Generalized Model of Interacting Dark Energy and Dark Matter : Phase Portrait Analysis of Evolving Universe
• Unveiling the Universe with Emerging Cosmological Probes
• Non-parametric reconstruction of the fine structure constant with galaxy clusters
• Spatial Curvature and Large Scale Lorentz Violation
• Forecast constraints on null tests of the $\Lambda$CDM model with SPHEREx
• New tests of dark sector interactions from the full-shape galaxy power spectrum
• The $H_0$ and $S_8$ tensions necessitate early and late time changes to $\Lambda$CDM