Constraining The Spatial Curvature With Cosmic Expansion History In A Cosmological Model With A Non-standard Sound Horizon
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 quant...
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ftmissouriunivst:oai:scholarsmine.mst.edu:phys_facwork-3762 2023-09-05T13:23:18+02:00 Constraining The Spatial Curvature With Cosmic Expansion History In A Cosmological Model With A Non-standard Sound Horizon Stevens, Jordan Khoraminezhad, Hasti Saito, Shun 2023-07-01T07:00:00Z https://scholarsmine.mst.edu/phys_facwork/2707 https://doi.org/10.1088/1475-7516/2023/07/046 unknown Scholars' Mine https://scholarsmine.mst.edu/phys_facwork/2707 doi:10.1088/1475-7516/2023/07/046 https://doi.org/10.1088/1475-7516/2023/07/046 © 2023 IOP Publishing, All rights reserved. Physics Faculty Research & Creative Works baryon acoustic oscillations dark energy theory Physics text 2023 ftmissouriunivst https://doi.org/10.1088/1475-7516/2023/07/046 2023-08-19T22:26:26Z 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 ΩK = -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, ΩK = -0.0001± 0.0018. Text South pole Missouri University of Science and Technology (Missouri S&T): Scholars' Mine South Pole Journal of Cosmology and Astroparticle Physics 2023 07 046 |
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Missouri University of Science and Technology (Missouri S&T): Scholars' Mine |
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baryon acoustic oscillations dark energy theory Physics |
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baryon acoustic oscillations dark energy theory Physics Stevens, Jordan Khoraminezhad, Hasti Saito, Shun Constraining The Spatial Curvature With Cosmic Expansion History In A Cosmological Model With A Non-standard Sound Horizon |
topic_facet |
baryon acoustic oscillations dark energy theory Physics |
description |
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 ΩK = -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, ΩK = -0.0001± 0.0018. |
format |
Text |
author |
Stevens, Jordan Khoraminezhad, Hasti Saito, Shun |
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 |
Scholars' Mine |
publishDate |
2023 |
url |
https://scholarsmine.mst.edu/phys_facwork/2707 https://doi.org/10.1088/1475-7516/2023/07/046 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
Physics Faculty Research & Creative Works |
op_relation |
https://scholarsmine.mst.edu/phys_facwork/2707 doi:10.1088/1475-7516/2023/07/046 https://doi.org/10.1088/1475-7516/2023/07/046 |
op_rights |
© 2023 IOP Publishing, All rights reserved. |
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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1776203878079922176 |