论文标题
通过球状簇恒星的能量沉积来限制重型轴突样颗粒
Constraining heavy axion-like particles by energy deposition in Globular Cluster stars
论文作者
论文摘要
重轴状颗粒（阿尔卑斯山），质量高达100 keV并与光子结合，可以在恒星等离子体中有效产生，从而有助于大量的能量损坏。该参数已应用于球状簇（GC）中的氦气燃烧恒星，以在Alp-Photon耦合$ G_ {Aγ} $上获得严格的边界。但是，对于足够大的ALP质量值并与光子耦合，应该期望大量的阿尔卑斯山在恒星内腐烂。这些阿尔卑斯山没有导致能量损失，而是导致恒星内部有效的能量转移。我们提出了一种新的弹道食谱，涵盖了能量减损和能量转移方案，并对包括ALP能量传递在内的GC恒星进行了首次专用模拟。该参数使我们能够用$ M_A \ Lessim 0.4 $ MEV和$ G_ {Aγ} \ Simeq 10^{ - 5} $ GEV $^{ - 1} $限制ALP，探测了ALP参数空间的一部分，该部分非正式地称为“ COSMOLICAGIOG TRIANGEL”。该区域特别有趣，因为它仅使用可以在非标准场景中逃避的标准宇宙论参数被排除在外。
Heavy axion-like particles (ALPs), with masses up to a few 100 keV and coupled with photons can be efficiently produced in stellar plasmas, contributing to a significant energy-loss. This argument has been applied to helium burning stars in Globular Clusters (GCs) to obtain stringent bounds on the ALP-photon coupling $g_{aγ}$. However, for sufficiently large values of the ALP mass and coupling to photons, one should expect a significant fraction of ALPs to decay inside the star. These ALPs do not contribute to the energy loss but rather lead to an efficient energy transfer inside the star. We present a new ballistic recipe that covers both the energy-loss and energy-transfer regimes and we perform the first dedicated simulation of GC stars including the ALP energy transfer. This argument allows us to constrain ALPs with $m_a \lesssim 0.4$ MeV and $g_{aγ} \simeq 10^{-5}$ GeV$^{-1}$, probing a section of the ALP parameter space informally known as "cosmological triangle". This region is particularly interesting since it has been excluded only using standard cosmological arguments that can be evaded in nonstandard scenarios.
