Cosmological distance forecasts for the CSST Galaxy Survey using BAO peaks
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2025
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| author | Shi, Feng Tian, Jieyi Ding, Zhejie Yang, Xiaohu Gu, Yizhou Saulder, Christoph Li, Xiaoping Liu, Yanming Wang, Zitong Zhan, Hu Li, Ming Li, Xiaolei Guo, Hong Gong, Yan Han, Yunkun Li, Cheng Jing, Yipeng Sui, Jipeng Wen, Run Zhao, Gong-Bo Zou, Hu Zhang, Pengjie Zheng, Xianzhong Zhou, Xingchen |
| author_facet | Shi, Feng Tian, Jieyi Ding, Zhejie Yang, Xiaohu Gu, Yizhou Saulder, Christoph Li, Xiaoping Liu, Yanming Wang, Zitong Zhan, Hu Li, Ming Li, Xiaolei Guo, Hong Gong, Yan Han, Yunkun Li, Cheng Jing, Yipeng Sui, Jipeng Wen, Run Zhao, Gong-Bo Zou, Hu Zhang, Pengjie Zheng, Xianzhong Zhou, Xingchen |
| contents | The measurement of cosmological distances using baryon acoustic oscillations (BAO) is crucial for studying the universe's expansion. The Chinese Space Station Telescope (CSST) galaxy redshift survey, with its vast volume and sky coverage, provides an opportunity to address key challenges in cosmology. However, redshift uncertainties in galaxy surveys can degrade both angular and radial distance estimates. In this study, we forecast the precision of BAO distance measurements using mock CSST galaxy samples, applying a two-point correlation function (2PCF) wedge approach to mitigate redshift errors. We simulate redshift uncertainties of $σ_0 = 0.003$ and $σ_0 = 0.006$, representative of expected CSST errors, and examine their effects on the BAO peak and distance scaling factors, $α_\perp$ and $α_\parallel$, across redshift bins within $0.0 < z \leqslant 1.0$. The wedge 2PCF method proves more effective in detecting the BAO peak compared to the monopole 2PCF, particularly for $σ_0 = 0.006$. Constraints on the BAO peaks show that $α_\perp$ is well constrained around 1.0, regardless of $σ_0$, with precision between 1% and 3% across redshift bins. In contrast, $α_\parallel$ measurements are more sensitive to increases in $σ_0$. For $σ_0 = 0.003$, the results remain close to the fiducial value, with uncertainties ranging between 4% and 9%; for $σ_0 = 0.006$, significant deviations from the fiducial value are observed. We also study the ability to measure parameters $(Ω_m, H_0r_\mathrm{d})$ using distance measurements, proving robust constraints as a cosmological probe under CSST-like redshift uncertainties. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_08503 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Cosmological distance forecasts for the CSST Galaxy Survey using BAO peaks Shi, Feng Tian, Jieyi Ding, Zhejie Yang, Xiaohu Gu, Yizhou Saulder, Christoph Li, Xiaoping Liu, Yanming Wang, Zitong Zhan, Hu Li, Ming Li, Xiaolei Guo, Hong Gong, Yan Han, Yunkun Li, Cheng Jing, Yipeng Sui, Jipeng Wen, Run Zhao, Gong-Bo Zou, Hu Zhang, Pengjie Zheng, Xianzhong Zhou, Xingchen Cosmology and Nongalactic Astrophysics The measurement of cosmological distances using baryon acoustic oscillations (BAO) is crucial for studying the universe's expansion. The Chinese Space Station Telescope (CSST) galaxy redshift survey, with its vast volume and sky coverage, provides an opportunity to address key challenges in cosmology. However, redshift uncertainties in galaxy surveys can degrade both angular and radial distance estimates. In this study, we forecast the precision of BAO distance measurements using mock CSST galaxy samples, applying a two-point correlation function (2PCF) wedge approach to mitigate redshift errors. We simulate redshift uncertainties of $σ_0 = 0.003$ and $σ_0 = 0.006$, representative of expected CSST errors, and examine their effects on the BAO peak and distance scaling factors, $α_\perp$ and $α_\parallel$, across redshift bins within $0.0 < z \leqslant 1.0$. The wedge 2PCF method proves more effective in detecting the BAO peak compared to the monopole 2PCF, particularly for $σ_0 = 0.006$. Constraints on the BAO peaks show that $α_\perp$ is well constrained around 1.0, regardless of $σ_0$, with precision between 1% and 3% across redshift bins. In contrast, $α_\parallel$ measurements are more sensitive to increases in $σ_0$. For $σ_0 = 0.003$, the results remain close to the fiducial value, with uncertainties ranging between 4% and 9%; for $σ_0 = 0.006$, significant deviations from the fiducial value are observed. We also study the ability to measure parameters $(Ω_m, H_0r_\mathrm{d})$ using distance measurements, proving robust constraints as a cosmological probe under CSST-like redshift uncertainties. |
| title | Cosmological distance forecasts for the CSST Galaxy Survey using BAO peaks |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2501.08503 |