Exploring the growth index γ L : Insights from different CMB dataset combinations and approaches

Specogna, Enrico; Di Valentino, Eleonora; Said, Jackson Levi; Nguyen, Nhat-Minh

doi:10.1103/PhysRevD.109.043528

Title: Exploring the growth index $γ_{L}$ : Insights from different CMB dataset combinations and approaches

Journal Article · 20 February 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.109.043528 · OSTI ID:2310418

Specogna, Enrico;

; Said, Jackson Levi; Nguyen, Nhat-Minh

In this study we investigate the growth index $γ_{L}$ , 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 : and __. In our analysis we uncover a deviation of the growth index from its expected $Λ CDM$ value of 0.55 when utilizing the Planck dataset, both in the case and in the __ 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 cosmic microwave background lensing data helps reconcile $γ_{L}$ with its $Λ$ -cold dark matter value in both cases. Conversely, the alternative ground-based telescopes Atacama Cosmology Telescope and South Pole Telescope consistently yield growth index values in agreement with $γ_{L} = 0.55$ . We conclude that the presence of the $A_{lens}$ problem in the Planck dataset contributes to the observed deviations, underscoring the importance of additional datasets in resolving these discrepancies. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-95ER40899

OSTI ID:: 2310418

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 4 Vol. 109; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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