论文标题
腐烂的轴颗粒粒子的宇宙学限制：全球分析
Cosmological constraints on decaying axion-like particles: a global analysis
论文作者
论文摘要
已知将光子腐烂的轴突状颗粒（ALP）影响广泛的天体物理和宇宙学可观察物。在这项研究中，我们专注于kev-Mev范围内的质量和寿命$ 10^4 $至$ 10^{13} $秒之间的阿尔卑斯山，对应于大爆炸核合成结束与宇宙微波背景（CMB）之间的衰变。使用全球拟合框架Gambit的Cosmobit模块，我们结合了对不可减至的ALP冻结丰度，原始元素丰度（包括通过ALP衰减的光启示性）的最新计算，CMB光谱扭曲和各向异性和偏用型和Supernovae和Stellar coolerrape和Stellar Coolering的约束。这种方法使得首次可以对ALP参数空间进行全局分析，同时改变$λ$ CDM的参数以及几个滋扰参数。我们在$ M_A> 300 \，\ text {kev} $的ALP质量上找到一个下限，只有在Alps稳定的宇宙时间标准时，才能避免使用。预计将带有小精灵任务的CMB光谱扭曲的未来观察结果将通过两个数量级来改善这一点。
Axion-like particles (ALPs) decaying into photons are known to affect a wide range of astrophysical and cosmological observables. In this study we focus on ALPs with masses in the keV-MeV range and lifetimes between $10^4$ and $10^{13}$ seconds, corresponding to decays between the end of Big Bang Nucleosynthesis and the formation of the Cosmic Microwave Background (CMB). Using the CosmoBit module of the global fitting framework GAMBIT, we combine state-of-the-art calculations of the irreducible ALP freeze-in abundance, primordial element abundances (including photodisintegration through ALP decays), CMB spectral distortions and anisotropies, and constraints from supernovae and stellar cooling. This approach makes it possible for the first time to perform a global analysis of the ALP parameter space while varying the parameters of $Λ$CDM as well as several nuisance parameters. We find a lower bound on the ALP mass of around $m_a > 300\,\text{keV}$, which can only be evaded if ALPs are stable on cosmological timescales. Future observations of CMB spectral distortions with a PIXIE-like mission are expected to improve this bound by two orders of magnitude.
