Ultralight axions versus primordial black holes

被引：2
作者：
Coriano, Claudio [1 ,2 ]
Frampton, Paul H. [1 ,2 ]
Kim, Jihn E. [3 ]
机构：
[1] Univ Salento, Dipartimento Matemat & Fis Ennio De Giorgi, Via Arnesano, I-73100 Lecce, Italy
[2] INFN Lecce, Via Arnesano, I-73100 Lecce, Italy
[3] Kyung Hee Univ, Dept Phys, 26 Gyungheedaero, Seoul 02447, South Korea
来源：
MODERN PHYSICS LETTERS A | 2021年 / 36卷 / 34期
基金：
新加坡国家研究基金会;
关键词：
Dark matter; axions; primordial black holes; INVARIANCE;
D O I：
10.1142/S0217732321502412
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We reconsider entropy arguments which have been previously argued to support the idea that the dark matter constituents are primordial black holes with many solar masses. It has recently been shown that QCD axions which solve the strong CP problem may have masses m(a) in the extended range 10(-3) eV > m(a) > 10(-33)eV. Ultralight axions provide so many degrees of freedom that their entropy can exceed that of primordial black holes. This suggests that ultralight axions are more suited than primordial black holes to be constituents of dark matter.
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页数：9
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