Exploring new physics in the late Universe's expansion through non-parametric inference

Abstract

In this study, we investigate deviations from the Planck-$\Lambda$CDM model in the late universe ($z\lesssim 2.5$) using the Gaussian Processes method, with minimal assumptions. Our goal is to understand where exploring new physics in the late universe is most relevant. We analyze recent Cosmic Chronometers (CC), Type Ia Supernovae (SN), and Baryon Acoustic Oscillations (BAO) data. By examining reconstructions of the dimensionless parameter $\delta (z)$, which measures deviations of the Hubble parameter from the Planck-$\Lambda$CDM predictions, we identify intriguing features at low ($z\lesssim 0.5$) and high ($z\gtrsim 2$) redshifts. Deviations from the Planck-$\Lambda$CDM model were not significant between $0.5\lesssim z\lesssim 2$. Using the combined CC+SN+BAO dataset, we gain insights into dark energy (DE) dynamics, resembling characteristics of omnipotent DE, extending beyond quintessence and phantom models. DE exhibits n-quintessence traits for $z\gtrsim 2$, transitioning with a singularity around $z\sim 2$ to usual phantom traits in $1\lesssim z\lesssim 2$. DE characteristics differ between scenarios ($H_0$-SH0ES and $H_0$-$\Lambda$\&CMB), with $H_0$-SH0ES leaning towards phantom traits and $H_0$-$\Lambda$\&CMB towards quintessence. We suggest exploring new physics at $z\lesssim 0.5$ and $1.5\lesssim z\lesssim 2.5$, particularly around $z=2$, to understand cosmological tensions such as $H_0$ and $S_8$.

arXiv comment15 pages, 11 figures. Accepted for publication in EPJC

References in corpus (67)

• Dynamics of dark energy
• The Cosmological Constant and Dark Energy
• The Complete Light-curve Sample of Spectroscopically Confirmed Type Ia Supernovae from Pan-STARRS1 and Cosmological Constraints from The Combined Pantheon Sample
• In the Realm of the Hubble tension $-$ a Review of Solutions
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Cosmological Implications from two Decades of Spectroscopic Surveys at the Apache Point observatory
• Dark Energy Survey Year 3 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
• Tensions between the Early and the Late Universe
• Challenges for $\Lambda$CDM: An update
• Conservative Constraints on Early Cosmology: an illustration of the Monte Python cosmological parameter inference code
• KiDS-1000 Cosmology: Cosmic shear constraints and comparison between two point statistics
• The Hubble Hunter's Guide
• Cosmology Intertwined II: The Hubble Constant Tension
• The Expansion of the Universe is Faster than Expected
• Cosmology Intertwined III: $f{\sigma }_8$ and $S_8$
• Reconstruction of dark energy and expansion dynamics using Gaussian processes
• Non-minimal dark sector physics and cosmological tensions
• Can interacting dark energy solve the $H_0$ tension?
• Interacting dark energy in the early 2020s: a promising solution to the $H_0$ and cosmic shear tensions
• Gaussian Process Cosmography
• Model independent evidence for dark energy evolution from Baryon Acoustic Oscillations
• To H0 or not to H0?
• Type Ia Supernova Distances at z > 1.5 from the Hubble Space Telescope Multi-Cycle Treasury Programs: The Early Expansion Rate
• $H_0$ from cosmic chronometers and Type Ia supernovae, with Gaussian Processes and the novel Weighted Polynomial Regression method
• Echo of interactions in the dark sector
• Nonparametric Dark Energy Reconstruction from Supernova Data
• Interacting scenarios with dynamical dark energy: observational constraints and alleviation of the $H_0$ tension
• Interacting dark energy with time varying equation of state and the $H_0$ tension
• Revisiting a negative cosmological constant from low-redshift data
• Graduated dark energy: Observational hints of a spontaneous sign switch in the cosmological constant
• Update on Coupled Dark Energy and the $H_0$ tension
• Dark Energy with Phantom Crossing and the $H_0$ tension
• Dark sector interaction: a remedy of the tensions between CMB and LSS data
• Nonparametric Reconstruction of the Dark Energy Equation of State
• Cosmographic analysis with Chebyshev polynomials
• Cluster Cepheids with High Precision Gaia Parallaxes, Low Zeropoint Uncertainties, and Hubble Space Telescope Photometry
• Relaxing cosmological tensions with a sign switching cosmological constant
• Tensions in the dark: shedding light on Dark Matter-Dark Energy interactions
• An improved model-independent assessment of the late-time cosmic expansion
• Model independent $H(z)$ reconstruction using the cosmic inverse distance ladder
• Evolution of dark energy reconstructed from the latest observations
• Beyond $\Lambda$CDM with Low and High Redshift Data: Implications for Dark Energy
• Cosmographic Hubble fits to the supernova data
• Nonparametric Reconstruction of the Dark Energy Equation of State from Diverse Data Sets
• Relaxing cosmological tensions with a sign switching cosmological constant: Improved results with Planck, BAO, and Pantheon data
• Exploring the $H_0$ tension and the evidence of dark sector interaction from 2D BAO measurements
• Can dark energy be dynamical?
• Do cosmological observations allow a negative $\Lambda$?
• Model-independent reconstruction of the Interacting Dark Energy Kernel: Binned and Gaussian process
• Omnipotent dark energy: A phenomenological answer to the Hubble tension
• How to use GP: Effects of the mean function and hyperparameter selection on Gaussian Process regression
• Measurements of $H_0$ and reconstruction of the dark energy properties from a model-independent joint analysis
• Remedy of some cosmological tensions via effective phantom-like behavior of interacting vacuum energy
• Improved constraints on the dark energy equation of state using Gaussian processes
• The resilience of the Etherington-Hubble relation
• Gaussian processes reconstruction of modified gravitational wave propagation
• Testing the Mutual Consistency of the Pantheon and SDSS/eBOSS BAO Data Sets with Gaussian Processes
• Inferring $S_8(z)$ and $\gamma (z)$ with cosmic growth rate measurements using machine learning
• Is the dark energy equation of state parameter singular?
• Principal reconstructed modes of dark energy and gravity
• Model selection applied to reconstructions of the Dark Energy
• Influence of the Bounds of the Hyperparameters on the Reconstruction of Hubble Constant with Gaussian Process
• Cosmographic view on the $H_0$ and ${\sigma }_8$ tensions
• Model independent bounds on Type Ia supernova absolute peak magnitude
• Non-parametric reconstruction of interaction in the cosmic dark sector
• Evidence for cosmic acceleration with next-generation surveys: A model-independent approach
• A cosmic glitch in gravity
• A comparison of Bayesian and frequentist confidence intervals in the presence of a late Universe degeneracy

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• Revisiting the temperature evolution law of the CMB with gaussian processes
• Nonlinear Matter Power Spectrum from relativistic $N$-body Simulations: ${\Lambda }_{\mathrm{s}}$CDM versus $\Lambda$CDM
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