CMB Anomalies and the Hubble Tension

Abstract

The standard $\Lambda$CDM model of cosmology is largely successful in describing many observations, including precise measurements of the Cosmic Microwave Background (CMB) radiation. However, some intriguing anomalies remain currently unexplained within this theoretical framework. Such discrepancies can be broadly categorized into two groups: those involving CMB-independent probes and those within different CMB experiments. Examples of the former category include the $H_0$-tension between the value of the present-day expansion rate of the Universe inferred by CMB observations and local distance ladder measurements. The latter category involves anomalies between the values of cosmological parameters obtained by different CMB experiments, as well as their consistency with the predictions of $\Lambda$CDM. In this chapter, we primarily focus on this second category and study the agreement among the most recent CMB measurements to acquire a better understanding of the limitations and uncertainties underlying both the current data and the cosmological model. Finally, we discuss the implications for the $H_0$-tension.

Invited chapter for the edited book "Hubble Constant Tension" (Eds. E. Di Valentino and D. Brout, Springer Singapore, expected in 2024)

References in corpus (9)

• The trouble with $H_0$
• Planck evidence for a closed Universe and a possible crisis for cosmology
• Towards early dark energy and $n_s$=1 with Planck, ACT and SPT
• A Comparison of Cosmological Parameters Determined from CMB Temperature Power Spectra from the South Pole Telescope and the Planck Satellite
• Health checkup test of the standard cosmological model in view of recent Cosmic Microwave Background Anisotropies experiments
• Towards hybrid inflation with $n_s=1$ in light of Hubble tension and primordial gravitational waves
• Quantifying the global "CMB tension" between the Atacama Cosmology Telescope and the Planck satellite in extended models of cosmology
• Cosmology Intertwined: A Review of the Particle Physics, Astrophysics, and Cosmology Associated with the Cosmological Tensions and Anomalies
• A Measurement of the CMB Temperature Power Spectrum and Constraints on Cosmology from the SPT-3G 2018 TT/TE/EE Data Set

Cited by in corpus (21)

• Robust Preference for Dynamical Dark Energy in DESI BAO and SN Measurements
• An overview of what current data can (and cannot yet) say about evolving dark energy
• The state of the dark energy equation of state circa 2023
• A double take on early and interacting dark energy from JWST
• Pressure Parametrization of Dark Energy: First and Second-Order Constraints with Latest Cosmological Data
• Inflationary Potential as seen from Different Angles: Model Compatibility from Multiple CMB Missions
• Exploring the Hubble tension with a late time Modified Gravity scenario
• Planck-PR4 anisotropy spectra show (better) consistency with General Relativity
• Tracking the Multifield Dynamics with Cosmological Data: A Monte Carlo approach
• Do we need wavelets in the late Universe?
• ${\Lambda }_{\mathrm{s}}$CDM cosmology from a type-II minimally modified gravity
• I. Linear Interacting Dark Energy: Analytical Solutions and Theoretical Pathologies
• One Extension to Explain Them All, One Scale-Invariant Spectrum to Test Them All, and in One Model Bind Them
• Resilience and implications of adiabatic CMB cooling
• A New Window on Dynamical Dark Energy: Combining DESI-DR2 BAO with future Gravitational Wave Observations
• Inflation in non-local hybrid metric-Palatini gravity
• Nonlinear Matter Power Spectrum from relativistic $N$-body Simulations: ${\Lambda }_{\mathrm{s}}$CDM versus $\Lambda$CDM
• Neural Networks for cosmological model selection and feature importance using Cosmic Microwave Background data
• Revisiting the Matter Creation Process: Observational Constraints on Gravitationally Induced Dark Energy and the Hubble Tension
• Resolving the Hubble Tension in the Early Dark Energy Framework with JWST and DESI Data
• Modifying $\Lambda$CDM dynamics via out-of-equilibrium axions: reconciling SH0ES and DESI $H_0$ values