Constraining the spatial curvature with cosmic expansion history in a cosmological model with a non-standard sound horizon
Abstract Spatial curvature is one of the most fundamental parameters in our current concordance flat ΛCDM model of the Universe. The goal of this work is to investigate how the constraint on the spatial curvature is affected by an assumption on the sound horizon scale. The sound horizon is an essent...
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crioppubl:10.1088/1475-7516/2023/07/046 2024-09-15T18:36:48+00:00 Constraining the spatial curvature with cosmic expansion history in a cosmological model with a non-standard sound horizon Stevens, Jordan Khoraminezhad, Hasti Saito, Shun 2023 http://dx.doi.org/10.1088/1475-7516/2023/07/046 https://iopscience.iop.org/article/10.1088/1475-7516/2023/07/046 https://iopscience.iop.org/article/10.1088/1475-7516/2023/07/046/pdf unknown IOP Publishing https://iopscience.iop.org/page/copyright https://iopscience.iop.org/info/page/text-and-data-mining Journal of Cosmology and Astroparticle Physics volume 2023, issue 07, page 046 ISSN 1475-7516 journal-article 2023 crioppubl https://doi.org/10.1088/1475-7516/2023/07/046 2024-08-26T04:19:23Z Abstract Spatial curvature is one of the most fundamental parameters in our current concordance flat ΛCDM model of the Universe. The goal of this work is to investigate how the constraint on the spatial curvature is affected by an assumption on the sound horizon scale. The sound horizon is an essential quantity to use the standard ruler from the Cosmic Microwave Background (CMB) and Baryon Acoustic Oscillations (BAOs). As an example, we study the curvature constraint in an axion-like Early Dark Energy (EDE) model in light of recent cosmological datasets from Planck, the South Pole Telescope (SPT), and the Atacama Cosmology Telescope (ACT), as well as BAO data compiled in Sloan Digital Sky Survey Data Release 16. We find that, independent of the CMB datasets, the EDE model parameters are constrained only by the CMB power spectra as precisely and consistently as the flat case in previous work, even with the spatial curvature. We also demonstrate that combining CMB with BAO is extremely powerful to constrain the curvature parameter even with a reduction of the sound-horizon scale in an EDE model, resulting in Ω K = -0.0058± 0.0031 in the case of ACT+BAO after marginalizing over the parameters of the EDE model. This constraint is as competitive as the Planck+BAO result in a ΛCDM model, Ω K = -0.0001± 0.0018. Article in Journal/Newspaper South pole IOP Publishing Journal of Cosmology and Astroparticle Physics 2023 07 046 |
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Abstract Spatial curvature is one of the most fundamental parameters in our current concordance flat ΛCDM model of the Universe. The goal of this work is to investigate how the constraint on the spatial curvature is affected by an assumption on the sound horizon scale. The sound horizon is an essential quantity to use the standard ruler from the Cosmic Microwave Background (CMB) and Baryon Acoustic Oscillations (BAOs). As an example, we study the curvature constraint in an axion-like Early Dark Energy (EDE) model in light of recent cosmological datasets from Planck, the South Pole Telescope (SPT), and the Atacama Cosmology Telescope (ACT), as well as BAO data compiled in Sloan Digital Sky Survey Data Release 16. We find that, independent of the CMB datasets, the EDE model parameters are constrained only by the CMB power spectra as precisely and consistently as the flat case in previous work, even with the spatial curvature. We also demonstrate that combining CMB with BAO is extremely powerful to constrain the curvature parameter even with a reduction of the sound-horizon scale in an EDE model, resulting in Ω K = -0.0058± 0.0031 in the case of ACT+BAO after marginalizing over the parameters of the EDE model. This constraint is as competitive as the Planck+BAO result in a ΛCDM model, Ω K = -0.0001± 0.0018. |
format |
Article in Journal/Newspaper |
author |
Stevens, Jordan Khoraminezhad, Hasti Saito, Shun |
spellingShingle |
Stevens, Jordan Khoraminezhad, Hasti Saito, Shun Constraining the spatial curvature with cosmic expansion history in a cosmological model with a non-standard sound horizon |
author_facet |
Stevens, Jordan Khoraminezhad, Hasti Saito, Shun |
author_sort |
Stevens, Jordan |
title |
Constraining the spatial curvature with cosmic expansion history in a cosmological model with a non-standard sound horizon |
title_short |
Constraining the spatial curvature with cosmic expansion history in a cosmological model with a non-standard sound horizon |
title_full |
Constraining the spatial curvature with cosmic expansion history in a cosmological model with a non-standard sound horizon |
title_fullStr |
Constraining the spatial curvature with cosmic expansion history in a cosmological model with a non-standard sound horizon |
title_full_unstemmed |
Constraining the spatial curvature with cosmic expansion history in a cosmological model with a non-standard sound horizon |
title_sort |
constraining the spatial curvature with cosmic expansion history in a cosmological model with a non-standard sound horizon |
publisher |
IOP Publishing |
publishDate |
2023 |
url |
http://dx.doi.org/10.1088/1475-7516/2023/07/046 https://iopscience.iop.org/article/10.1088/1475-7516/2023/07/046 https://iopscience.iop.org/article/10.1088/1475-7516/2023/07/046/pdf |
genre |
South pole |
genre_facet |
South pole |
op_source |
Journal of Cosmology and Astroparticle Physics volume 2023, issue 07, page 046 ISSN 1475-7516 |
op_rights |
https://iopscience.iop.org/page/copyright https://iopscience.iop.org/info/page/text-and-data-mining |
op_doi |
https://doi.org/10.1088/1475-7516/2023/07/046 |
container_title |
Journal of Cosmology and Astroparticle Physics |
container_volume |
2023 |
container_issue |
07 |
container_start_page |
046 |
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1810480514188967936 |