Exploring the Growth Index ${\gamma }_L$: Insights from Different CMB Dataset Combinations and Approaches

Abstract

In this study we investigate the growth index ${\gamma }_L$, which characterizes the growth of linear matter perturbations, while analysing different cosmological datasets. We compare the approaches implemented by two different patches of the cosmological solver CAMB: MGCAMB and CAMB_GammaPrime_Growth. In our analysis we uncover a deviation of the growth index from its expected $\Lambda$CDM value of $0.55$ when utilizing the Planck dataset, both in the MGCAMB case and in the CAMB_GammaPrime_Growth case, but in opposite directions. This deviation is accompanied by a change in the direction of correlations with derived cosmological parameters. However, the incorporation of CMB lensing data helps reconcile ${\gamma }_L$ with its $\Lambda$CDM value in both cases. Conversely, the alternative ground-based telescopes ACT and SPT consistently yield growth index values in agreement with ${\gamma }_L=0.55$. We conclude that the presence of the A${}_{\mathrm{lens}}$ problem in the Planck dataset contributes to the observed deviations, underscoring the importance of additional datasets in resolving these discrepancies.

arXiv comment14 pages, 8 figures, 7 tables. V2: Match version accepted for publication in PRD

References in corpus (68)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• Dynamics of dark energy
• The Cosmological Constant and Dark Energy
• Efficient Computation of CMB anisotropies in closed FRW models
• Cosmological parameters from CMB and other data: a Monte-Carlo approach
• Exploring the Expansion History of the Universe
• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Final Maps and Results
• 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
• In the Realm of the Hubble tension $-$ a Review of Solutions
• Planck 2018 results. I. Overview and the cosmological legacy of Planck
• Results from a search for dark matter in the complete LUX exposure
• 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
• H0LiCOW XIII. A 2.4% measurement of $H_0$ from lensed quasars: $5.3\sigma$ tension between early and late-Universe probes
• Planck 2018 results. V. CMB power spectra and likelihoods
• Primordial Black Holes as Dark Matter
• Cluster Abundance Constraints on Quintessence Models
• Challenges for $\Lambda$CDM: An update
• Cosmic Growth History and Expansion History
• KiDS-1000 Cosmology: Multi-probe weak gravitational lensing and spectroscopic galaxy clustering constraints
• Planck 2018 results. VIII. Gravitational lensing
• The Hubble Hunter's Guide
• The Atacama Cosmology Telescope: DR4 Maps and Cosmological Parameters
• Planck evidence for a closed Universe and a possible crisis for cosmology
• Efficient sampling of fast and slow cosmological parameters
• Measurements of the Hubble Constant: Tensions in Perspective
• Cosmology Intertwined II: The Hubble Constant Tension
• CMB power spectrum parameter degeneracies in the era of precision cosmology
• The Expansion of the Universe is Faster than Expected
• Cosmology Intertwined III: $f{\sigma }_8$ and $S_8$
• Calibration of the Tip of the Red Giant Branch (TRGB)
• Curvature tension: evidence for a closed universe
• The Megamaser Cosmology Project. XIII. Combined Hubble constant constraints
• Cosmic Structure Growth and Dark Energy
• The Atacama Cosmology Telescope: A Measurement of the Cosmic Microwave Background Power Spectra at 98 and 150 GHz
• Measurements of the E-Mode Polarization and Temperature-E-Mode Correlation of the CMB from SPT-3G 2018 Data
• Searching for modified growth patterns with tomographic surveys
• Cosmic Microwave Weak lensing data as a test for the dark universe
• Testing gravity with CAMB and CosmoMC
• Hyper Suprime-Cam Year 3 Results: Cosmology from Cosmic Shear Power Spectra
• Why reducing the cosmic sound horizon alone can not fully resolve the Hubble tension
• Hubble Space Telescope Observations of Mira Variables in the Type Ia Supernova Host NGC 1559: An Alternative Candle to Measure the Hubble Constant
• Arbitrating the $S_8$ discrepancy with growth rate measurements from Redshift-Space Distortions
• The Hubble Constant from Infrared Surface Brightness Fluctuation Distances
• Running Hubble Tension and a H0 Diagnostic
• The Pantheon+ Analysis: SuperCal-Fragilistic Cross Calibration, Retrained SALT2 Light Curve Model, and Calibration Systematic Uncertainty
• How to optimally parametrize deviations from General Relativity in the evolution of cosmological perturbations
• Investigating Cosmic Discordance
• A combined analysis of the $H_0$ late time direct measurements and the impact on the Dark Energy sector
• Cluster Cepheids with High Precision Gaia Parallaxes, Low Zeropoint Uncertainties, and Hubble Space Telescope Photometry
• Probing Gravitation, Dark Energy, and Acceleration
• Cosmicflows 4: The Calibration of Optical and Infrared Tully-Fisher Relations
• Using The Baryonic Tully-Fisher Relation to Measure $H_o$
• Weak lensing of the CMB
• TDCOSMO. XII. Improved Hubble constant measurement from lensing time delays using spatially resolved stellar kinematics of the lens galaxy
• Evidence for suppression of structure growth in the concordance cosmological model
• Cosmology Intertwined I: Perspectives for the Next Decade
• A 5% measurement of the Hubble constant from Type II supernovae
• MGCAMB with massive neutrinos and dynamical dark energy
• Health checkup test of the standard cosmological model in view of recent Cosmic Microwave Background Anisotropies experiments
• $S_8$ increases with effective redshift in $\Lambda$CDM cosmology
• New MGCAMB tests of gravity with CosmoMC and Cobaya
• Growth Index after the Planck Results
• Sweeping Horndeski Canvas: New Growth-Rate Parameterization for Modified-Gravity Theories
• The End of Cosmic Growth
• Dark Energy, Expansion History of the Universe, and SNAP

Cited by in corpus (12)

• Measuring the reionization optical depth without large-scale CMB polarization
• Planck-PR4 anisotropy spectra show (better) consistency with General Relativity
• Neutrino mass tension or suppressed growth rate of matter perturbations?
• Linear matter density perturbations in the ${\Lambda }_{\mathrm{s}}$CDM model: Examining growth dynamics and addressing the $S_8$ tension
• ${\Lambda }_{\mathrm{s}}$CDM cosmology from a type-II minimally modified gravity
• Revisiting CPL with sign-switching density: To cross or not to cross the NECB
• Late-time Background Constraints on Linear and Non-linear Interacting Dark Energy after DESI DR2
• Explaining JWST star formation history at $z\sim 17$ by modifying $\Lambda$CDM
• Observational constraints on the growth index parameters in $f(Q)$ gravity
• Inflation in non-local hybrid metric-Palatini gravity
• Crunching, Bouncing, and Cyclical Cosmologies from Dark Sector Interactions
• Joint Curvature and Growth Rate measurements with Supernova Peculiar Velocities and the CMB