Testing the $n_s-H_0$ scaling relation with Planck-independent CMB data
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| Format: | Preprint |
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2023
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| _version_ | 1866911765807235072 |
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| author | Peng, Ze-Yu Piao, Yun-Song |
| author_facet | Peng, Ze-Yu Piao, Yun-Song |
| contents | In early dark energy (EDE) resolution of Hubble tension, the spectral index $n_s$ of primordial scalar perturbation follows a scaling relation ${δn_s}\simeq 0.4\frac{δH_0}{H_0}$, where $H_0$ is the Hubble constant. However, this $n_s-H_0$ relation was obtained based on the datasets including Planck cosmic microwave background (CMB) data. In this paper, we investigate this scaling relation with Planck-independent CMB data, i.e. ACT and SPT-3G combined with WMAP(+BAO+Pantheon), respectively. Our results show that the WMAP+SPT-3G dataset also follows this scaling relation, while the WMAP+ACT dataset seems to favor smaller $n_s$, which is related to the fact that the critical redshift $z_c$, at which EDE is excited, favored by the WMAP+ACT dataset is lower and closer to the recombination time. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2308_01012 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Testing the $n_s-H_0$ scaling relation with Planck-independent CMB data Peng, Ze-Yu Piao, Yun-Song Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology In early dark energy (EDE) resolution of Hubble tension, the spectral index $n_s$ of primordial scalar perturbation follows a scaling relation ${δn_s}\simeq 0.4\frac{δH_0}{H_0}$, where $H_0$ is the Hubble constant. However, this $n_s-H_0$ relation was obtained based on the datasets including Planck cosmic microwave background (CMB) data. In this paper, we investigate this scaling relation with Planck-independent CMB data, i.e. ACT and SPT-3G combined with WMAP(+BAO+Pantheon), respectively. Our results show that the WMAP+SPT-3G dataset also follows this scaling relation, while the WMAP+ACT dataset seems to favor smaller $n_s$, which is related to the fact that the critical redshift $z_c$, at which EDE is excited, favored by the WMAP+ACT dataset is lower and closer to the recombination time. |
| title | Testing the $n_s-H_0$ scaling relation with Planck-independent CMB data |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2308.01012 |