Exploring the growth index γ L : insights from different CMB dataset combinations and approaches
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 camb: mgcamb and camb_gammaprime_growth. In ou...
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ftunivmalta:oai:www.um.edu.mt:123456789/121557 2024-05-19T07:48:39+00:00 Exploring the growth index γ L : insights from different CMB dataset combinations and approaches Specogna, Enrico Valentino, Eleonora D. Said, Jackson Nguyen, Nhat-Minh 2024 https://www.um.edu.mt/library/oar/handle/123456789/121557 https://doi.org/10.1103/PhysRevD.109.043528 en eng American Physical Society Specogna, E., Di Valentino, E., Said, J. L., & Nguyen, N. M. (2024). Exploring the growth index γ L: Insights from different CMB dataset combinations and approaches. Physical Review D, 109(4), 043528. 24700010 https://www.um.edu.mt/library/oar/handle/123456789/121557 doi:10.1103/PhysRevD.109.043528 info:eu-repo/semantics/openAccess The copyright of tis work belongs to the author(s)/publisher. The rights of this work are as defined by the appropriate Copyright Legislation or as modified by any successive legislation. Users may access this work and can make use of the information contained in accordance with the Copyright Legislation provided that the author must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the prior permission of the copyright holder. Cosmic background radiation Dark matter (Astronomy) Gravitational waves Statistical astronomy Large scale structure (Astronomy) article 2024 ftunivmalta https://doi.org/10.1103/PhysRevD.109.043528 2024-05-01T00:12:31Z 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 camb: mgcamb and camb_gammaprime_growth. 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 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 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. peer-reviewed Article in Journal/Newspaper South pole University of Malta: OAR@UM Physical Review D 109 4 |
institution |
Open Polar |
collection |
University of Malta: OAR@UM |
op_collection_id |
ftunivmalta |
language |
English |
topic |
Cosmic background radiation Dark matter (Astronomy) Gravitational waves Statistical astronomy Large scale structure (Astronomy) |
spellingShingle |
Cosmic background radiation Dark matter (Astronomy) Gravitational waves Statistical astronomy Large scale structure (Astronomy) Specogna, Enrico Valentino, Eleonora D. Said, Jackson Nguyen, Nhat-Minh Exploring the growth index γ L : insights from different CMB dataset combinations and approaches |
topic_facet |
Cosmic background radiation Dark matter (Astronomy) Gravitational waves Statistical astronomy Large scale structure (Astronomy) |
description |
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 camb: mgcamb and camb_gammaprime_growth. 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 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 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. peer-reviewed |
format |
Article in Journal/Newspaper |
author |
Specogna, Enrico Valentino, Eleonora D. Said, Jackson Nguyen, Nhat-Minh |
author_facet |
Specogna, Enrico Valentino, Eleonora D. Said, Jackson Nguyen, Nhat-Minh |
author_sort |
Specogna, Enrico |
title |
Exploring the growth index γ L : insights from different CMB dataset combinations and approaches |
title_short |
Exploring the growth index γ L : insights from different CMB dataset combinations and approaches |
title_full |
Exploring the growth index γ L : insights from different CMB dataset combinations and approaches |
title_fullStr |
Exploring the growth index γ L : insights from different CMB dataset combinations and approaches |
title_full_unstemmed |
Exploring the growth index γ L : insights from different CMB dataset combinations and approaches |
title_sort |
exploring the growth index γ l : insights from different cmb dataset combinations and approaches |
publisher |
American Physical Society |
publishDate |
2024 |
url |
https://www.um.edu.mt/library/oar/handle/123456789/121557 https://doi.org/10.1103/PhysRevD.109.043528 |
genre |
South pole |
genre_facet |
South pole |
op_relation |
Specogna, E., Di Valentino, E., Said, J. L., & Nguyen, N. M. (2024). Exploring the growth index γ L: Insights from different CMB dataset combinations and approaches. Physical Review D, 109(4), 043528. 24700010 https://www.um.edu.mt/library/oar/handle/123456789/121557 doi:10.1103/PhysRevD.109.043528 |
op_rights |
info:eu-repo/semantics/openAccess The copyright of tis work belongs to the author(s)/publisher. The rights of this work are as defined by the appropriate Copyright Legislation or as modified by any successive legislation. Users may access this work and can make use of the information contained in accordance with the Copyright Legislation provided that the author must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the prior permission of the copyright holder. |
op_doi |
https://doi.org/10.1103/PhysRevD.109.043528 |
container_title |
Physical Review D |
container_volume |
109 |
container_issue |
4 |
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1799466966318055424 |