Extreme Axions Unveiled: a Novel Fluid Approach for Cosmological Modeling
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| Format: | Preprint |
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2023
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| _version_ | 1866917691061698560 |
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| author | Winch, Harrison Hlozek, Renee Marsh, David J. E. Grin, Daniel Rogers, Keir |
| author_facet | Winch, Harrison Hlozek, Renee Marsh, David J. E. Grin, Daniel Rogers, Keir |
| contents | Axion-like particles (ALPs) are a well-motivated dark matter candidate that solve some of the problems in the clustering of large scale structure in cosmology. ALPs are often described by a simplified quadratic potential to specify the dynamics of the axion field, and are included in cosmological analysis codes using a modified fluid prescription. In this paper we consider the extreme axion: a version of the axion with a high initial field angle that produces an enhancement (rather than a suppression) of structure on small scales around the Jeans length, which can be probed by measurements of clustering such as the eBOSS DR14 Ly-$α$ forest. We present a novel method of modeling the extreme axion as a cosmological fluid, combining the Generalized Dark Matter model with the effective fluid approach presented in the \texttt{axionCAMB} software, as well as implementing a series of computational innovations to efficiently simulate the extreme axions. We find that for axion masses between $10^{-23} \mathrm{\ eV} \lesssim m_\mathrm{ax} \lesssim 10^{-22.5} \mathrm{\ eV}$, constraints on the axion fraction imposed by the eBOSS DR14 Ly-$α$ forest can be significantly weakened by allowing them to be in the form of extreme axions with a starting angle between $π- 10^{-1} \lesssim θ_i \lesssim π- 10^{-2}$. This work motivates and enables a more robust hydrodynamical analysis of extreme axions in order to compare them to high-resolution Ly-$α$ forest data in the future. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2311_02052 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Extreme Axions Unveiled: a Novel Fluid Approach for Cosmological Modeling Winch, Harrison Hlozek, Renee Marsh, David J. E. Grin, Daniel Rogers, Keir Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology Axion-like particles (ALPs) are a well-motivated dark matter candidate that solve some of the problems in the clustering of large scale structure in cosmology. ALPs are often described by a simplified quadratic potential to specify the dynamics of the axion field, and are included in cosmological analysis codes using a modified fluid prescription. In this paper we consider the extreme axion: a version of the axion with a high initial field angle that produces an enhancement (rather than a suppression) of structure on small scales around the Jeans length, which can be probed by measurements of clustering such as the eBOSS DR14 Ly-$α$ forest. We present a novel method of modeling the extreme axion as a cosmological fluid, combining the Generalized Dark Matter model with the effective fluid approach presented in the \texttt{axionCAMB} software, as well as implementing a series of computational innovations to efficiently simulate the extreme axions. We find that for axion masses between $10^{-23} \mathrm{\ eV} \lesssim m_\mathrm{ax} \lesssim 10^{-22.5} \mathrm{\ eV}$, constraints on the axion fraction imposed by the eBOSS DR14 Ly-$α$ forest can be significantly weakened by allowing them to be in the form of extreme axions with a starting angle between $π- 10^{-1} \lesssim θ_i \lesssim π- 10^{-2}$. This work motivates and enables a more robust hydrodynamical analysis of extreme axions in order to compare them to high-resolution Ly-$α$ forest data in the future. |
| title | Extreme Axions Unveiled: a Novel Fluid Approach for Cosmological Modeling |
| topic | Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2311.02052 |