More axions from strings
More axions from strings
复制标题
DOI：
10.21468/scipostphys.10.2.050
复制
发表时间：
2021-02-01
期刊：
影响因子：
5.5
通讯作者：
Villadoro, Giovanni
中科院分区：
文献类型：
--
作者：
Gorghetto, Marco;Hardy, Edward;Villadoro, Giovanni
我们研究了在所谓的标度区中弦缺陷对QCD轴子暗物质丰度的贡献。发现了明显的违反标度的证据，其中最保守的外推强烈地表明弦上有大量的轴子。在这种情况下，QCD标度附近的非线性被证明在决定最终丰度方面起着重要作用。总体结果是，在后膨胀的情况下，QCD轴子质量的下限比未对准的幼稚的下限强得多。
We study the contribution to the QCD axion dark matter abundance that is produced by string defects during the so-called scaling regime. Clear evidence of scaling violations is found, the most conservative extrapolation of which strongly suggests a large number of axions from strings. In this regime, nonlinearities at around the QCD scale are shown to play an important role in determining the final abundance. The overall result is a lower bound on the QCD axion mass in the post-inflationary scenario that is substantially stronger than the naive one from misalignment.