Quantum Statistical Effects on Warm Dark Matter and the Mass Constraint from the Cosmic Large Scale Structure
2024
Online
report
Zugriff:
The suppression of 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 a degenerate pressure and a boson case with a 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 ($\gtrsim90\%$) 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 $\sim64\%$. 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 DM condensed component remains today.
Comment: 10 pages, 4 figures, comments welcome!
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Quantum Statistical Effects on Warm Dark Matter and the Mass Constraint from the Cosmic Large Scale Structure
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Autor/in / Beteiligte Person: | Zhang, Zhijian ; Lin, Weikang |
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Veröffentlichung: | 2024 |
Medientyp: | report |
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