Axion dark matter from first-order phase transition, and very high energy photons from GRB 221009A
Axion dark matter from first-order phase transition, and very high energy photons from GRB 221009A
复制标题
DOI：
10.1016/j.physletb.2023.137824
复制
发表时间：
2022-10
影响因子：
4.4
通讯作者：
Shota Nakagawa;F. Takahashi;Masaki Yamada;W. Yin
中科院分区：
文献类型：
--
作者：
Shota Nakagawa;F. Takahashi;Masaki Yamada;W. Yin
我们研究一个轴子状粒子（ALP），经历一级相变相对于其质量或潜在的最小值。如果ALP从SU（N）规范理论的非微扰效应中获得一个势，这个势通过一阶相变被限制，那么这就可以实现。类似的动力学在所谓的捕获错位机制中实现，其中ALP在高温下被捕获在假真空中，直到它开始围绕真正的最小值振荡。由此产生的ALP丰度显着增强相比，标准的错位机制，解释暗物质在一个更广泛的参数空间，可以访问的实验，如IAXO，ALPS-II，和DM无线电。此外，可行的参数空间包括一个质量为m a <$10 − 8− 10− 7 eV的区域和ALP-光子耦合g a γ γ <$10 − 11 GeV− 1，这可以解释最近通过轴子-光子振荡从GRB 221009 A观察到的非常高能量的光子。参数区域表明，FOPT可以产生解释NANOGrav暗示的引力波。如果这个区域的ALP解释了暗物质，那么ALP可能经历了一级相变。最后，我们还讨论了触发FOPT的暗扇区的宇宙学方面，并提出了一个可能的解决方案的冷却问题的暗胶球。
We study an axion-like particle (ALP) that experiences a first-order phase transition with respect to its mass or potential minimum. This can be realized if the ALP obtains a potential from non-perturbative effects of SU (N) gauge theory that is confined via the first-order phase transition. Similar dynamics are achieved in the so-called trapped misalignment mechanism, where the ALP is trapped in a false vacuum at high temperatures until it begins to oscillate about the true minimum. The resulting ALP abundance is significantly enhanced compared to the standard misalignment mechanism, explaining dark matter in a broader parameter space that is accessible to experiments eg IAXO, ALPS-II, and DM-radio. Furthermore, the viable parameter space includes a region of the mass m a≃ 10− 8− 10− 7 eV and the ALP-photon coupling g a γ γ≃ 10− 11 GeV− 1 that can explain the recent observation of very high energy photons from GRB221009A via axion-photon oscillations. The parameter region suggests that the FOPT can generate gravitational waves that explain the NANOGrav hint. If the ALP in this region explains dark matter, then the ALP might have experienced a first-order phase transition. Finally we also discuss cosmological aspects of the dark sector that triggers the FOPT and propose a possible solution to the cooling problem of dark glueballs.