Quantum Statistical Effects on Warm Dark Matter and the Mass Constraint from the Cosmic Structure at Small Scales
The suppression of the small-scale matter power spectrum is a distinct feature of warm dark matter (WDM), which permits a constraint on the WDM mass from galaxy surveys. In the thermal relic WDM scenario, quantum statistical effects are not manifest. In a unified framework, we investigate the quantu...
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal Letters |
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| Online Access: | https://doi.org/10.3847/2041-8213/ad772c |
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| author | Zhijian Zhang Weikang Lin |
| author_facet | Zhijian Zhang Weikang Lin |
| author_sort | Zhijian Zhang |
| collection | DOAJ |
| description | The suppression of the small-scale matter power spectrum is a distinct feature of warm dark matter (WDM), which permits a constraint on the WDM mass from galaxy surveys. In the thermal relic WDM scenario, quantum statistical effects are not manifest. In a unified framework, we investigate the quantum statistical effects for a fermion case with degenerate pressure and a boson case with Bose–Einstein condensation (BEC). Compared to the thermal relic case, the degenerate fermion case only slightly lowers the mass bound, while the boson case with a high initial BEC fraction (≳90%) significantly lowers it. On the other hand, the BEC fraction drops during the relativistic-to-nonrelativistic transition and completely disappears if the initial fraction is below ∼64%. Given the rising interest in resolving the late-time galaxy-scale problems with boson condensation, a question is posed on how a high initial BEC fraction can be dynamically created so that a dark matter condensed component remains today. |
| format | Article |
| id | doaj-art-eefa361b28c94af7a1edd41ee2771bb0 |
| institution | OA Journals |
| issn | 2041-8205 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal Letters |
| spelling | doaj-art-eefa361b28c94af7a1edd41ee2771bb02025-08-20T01:54:26ZengIOP PublishingThe Astrophysical Journal Letters2041-82052024-01-019732L4210.3847/2041-8213/ad772cQuantum Statistical Effects on Warm Dark Matter and the Mass Constraint from the Cosmic Structure at Small ScalesZhijian Zhang0https://orcid.org/0009-0001-3227-2225Weikang Lin1https://orcid.org/0000-0003-2240-7031South-Western Institute For Astronomy Research, Yunnan University , Kunming 650500, Yunnan, People’s Republic of China ; weikanglin@ynu.edu.cnSouth-Western Institute For Astronomy Research, Yunnan University , Kunming 650500, Yunnan, People’s Republic of China ; weikanglin@ynu.edu.cnThe suppression of the small-scale matter power spectrum is a distinct feature of warm dark matter (WDM), which permits a constraint on the WDM mass from galaxy surveys. In the thermal relic WDM scenario, quantum statistical effects are not manifest. In a unified framework, we investigate the quantum statistical effects for a fermion case with degenerate pressure and a boson case with Bose–Einstein condensation (BEC). Compared to the thermal relic case, the degenerate fermion case only slightly lowers the mass bound, while the boson case with a high initial BEC fraction (≳90%) significantly lowers it. On the other hand, the BEC fraction drops during the relativistic-to-nonrelativistic transition and completely disappears if the initial fraction is below ∼64%. Given the rising interest in resolving the late-time galaxy-scale problems with boson condensation, a question is posed on how a high initial BEC fraction can be dynamically created so that a dark matter condensed component remains today.https://doi.org/10.3847/2041-8213/ad772cDark matterWarm dark matterLarge-scale structure of the universe |
| spellingShingle | Zhijian Zhang Weikang Lin Quantum Statistical Effects on Warm Dark Matter and the Mass Constraint from the Cosmic Structure at Small Scales The Astrophysical Journal Letters Dark matter Warm dark matter Large-scale structure of the universe |
| title | Quantum Statistical Effects on Warm Dark Matter and the Mass Constraint from the Cosmic Structure at Small Scales |
| title_full | Quantum Statistical Effects on Warm Dark Matter and the Mass Constraint from the Cosmic Structure at Small Scales |
| title_fullStr | Quantum Statistical Effects on Warm Dark Matter and the Mass Constraint from the Cosmic Structure at Small Scales |
| title_full_unstemmed | Quantum Statistical Effects on Warm Dark Matter and the Mass Constraint from the Cosmic Structure at Small Scales |
| title_short | Quantum Statistical Effects on Warm Dark Matter and the Mass Constraint from the Cosmic Structure at Small Scales |
| title_sort | quantum statistical effects on warm dark matter and the mass constraint from the cosmic structure at small scales |
| topic | Dark matter Warm dark matter Large-scale structure of the universe |
| url | https://doi.org/10.3847/2041-8213/ad772c |
| work_keys_str_mv | AT zhijianzhang quantumstatisticaleffectsonwarmdarkmatterandthemassconstraintfromthecosmicstructureatsmallscales AT weikanglin quantumstatisticaleffectsonwarmdarkmatterandthemassconstraintfromthecosmicstructureatsmallscales |