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| Main Author: | |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2410.10559 |
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| _version_ | 1866916602063093760 |
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| author | Jiang, Jun-Qian |
| author_facet | Jiang, Jun-Qian |
| contents | The early dark energy (EDE) model is one of the promising solutions to the Hubble tension. One of the successes of the EDE model is that it can provide a similar fit to the $Λ$CDM model for the CMB power spectrum. In this work, I analyze the phenomenology of the EDE and $Λ$CDM parameters on the CMB temperature power spectrum and notice that this cannot hold on all scales. Thus, if the real cosmology is as described by the EDE model, the $Λ$CDM parameters will be scale-dependent when fitting the CMB power spectrum with the $Λ$CDM model, which can be hints for the EDE model. I examine CMB-S4-like observations through mock data analysis and find that parameter shifts are notable. As observations include smaller scales, I find lower $H_0$, $n_s$, $ω_b$ and higher $ω_m$, $A_s e^{-2τ}$, which will also constitute new tensions with other observations. They can serve as a possible signal for the EDE model. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_10559 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Scale-dependence in $Λ$CDM parameters inferred from the CMB: a possible sign of Early Dark Energy Jiang, Jun-Qian Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory The early dark energy (EDE) model is one of the promising solutions to the Hubble tension. One of the successes of the EDE model is that it can provide a similar fit to the $Λ$CDM model for the CMB power spectrum. In this work, I analyze the phenomenology of the EDE and $Λ$CDM parameters on the CMB temperature power spectrum and notice that this cannot hold on all scales. Thus, if the real cosmology is as described by the EDE model, the $Λ$CDM parameters will be scale-dependent when fitting the CMB power spectrum with the $Λ$CDM model, which can be hints for the EDE model. I examine CMB-S4-like observations through mock data analysis and find that parameter shifts are notable. As observations include smaller scales, I find lower $H_0$, $n_s$, $ω_b$ and higher $ω_m$, $A_s e^{-2τ}$, which will also constitute new tensions with other observations. They can serve as a possible signal for the EDE model. |
| title | Scale-dependence in $Λ$CDM parameters inferred from the CMB: a possible sign of Early Dark Energy |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2410.10559 |