球状星团恒星中重类轴子的能量沉积约束
Constraining heavy axion-like particles by energy deposition in Globular Cluster stars
摘要：
重类轴子粒子（ALPs），质量高达几百keV，并与光子耦合，可以有效地产生在恒星等离子体中，导致显着的能量损失。这个论点已被应用到球状星团（GC）的氦燃烧的恒星，以获得严格的限制ALP光子耦合$g_{aγ}$。然而，对于足够大的ALP质量和光子耦合值，我们应该预期有相当一部分ALP在恒星内部衰变。这些ALP不会导致能量损失，而是导致恒星内部的有效能量转移。我们提出了一个新的弹道配方，涵盖了能量损失和能量转移制度，我们进行了第一次专门的模拟GC星，包括ALP能量转移。这个论点允许我们用$m_a \lesssim 0.4$ MeV和$g_{aγ} \simeq 10^{-5}$ GeV $^{-1}$来约束ALP，探测ALP参数空间的一部分，非正式地称为“宇宙学三角形”。这个区域特别有趣，因为它只被排除在标准宇宙学的论点之外，而这些论点在非标准的情况下是可以逃避的。
英文摘要：
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.
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