arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2406.02159astro-ph.COhep-ph
收藏

量子统计效应对暖暗物质的影响及来自小尺度宇宙结构的质量约束

Quantum Statistical Effects on Warm Dark Matter and the Mass Constraint from the Cosmic Structure at Small Scales

Zhijian Zhang, Weikang Lin

AI总结:

本文在统一框架中研究量子统计效应对暖暗物质质量约束的影响,发现高初始玻色-爱因斯坦凝聚比例可显著降低质量下限,并探讨了如何动力学产生高初始凝聚比例的问题。

摘要:

小尺度物质功率谱的抑制是暖暗物质(WDM)的一个显著特征,这使得可以通过星系巡天对WDM质量施加约束。在热遗迹WDM情形中,量子统计效应并不明显。在一个统一框架内,我们研究了费米子情形下的量子统计效应(具有简并压)和玻色子情形下的量子统计效应(具有玻色-爱因斯坦凝聚,BEC)。与热遗迹情形相比,简并费米子情形仅略微降低了质量下限,而具有高初始BEC比例(≳90%)的玻色子情形则显著降低了质量下限。另一方面,BEC比例在相对论性到非相对论性转变期间下降,并且如果初始比例低于约64%,则会完全消失。鉴于利用玻色凝聚解决晚期星系尺度问题的兴趣日益增长,提出了一个问题:如何动力学地产生高初始BEC比例,从而使凝聚的暗物质组分能够保留至今。

英文摘要:

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 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 condensed DM component remains today.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑