White dwarfs as dark matter detectors
White dwarfs as dark matter detectors
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DOI：
10.1103/physrevd.98.115027
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发表时间：
2018-05
影响因子：
5
通讯作者：
P. Graham;R. Janish;V. Narayan;S. Rajendran;P. Riggins
中科院分区：
文献类型：
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作者：
P. Graham;R. Janish;V. Narayan;S. Rajendran;P. Riggins
能够充分加热白色矮星局部区域的暗物质将引发失控的聚变并点燃Ia型超新星。这最初是在Graham et al.（2015）中提出的，并用于约束通过动力学摩擦过境和加热白色矮星的原始黑洞。在本文中，我们认为暗物质（DM）的候选人，通过生产高能量标准模型（SM）粒子的热量，并表明这种粒子将有效地热化的白色矮介质和点燃超新星。基于长寿命白色矮星的存在和观测到的超新星爆发率，我们导出了超重DM在恒星介质中通过DM-DM湮灭、DM衰变和DM-SM散射相互作用产生SM粒子的新约束条件.作为一个具体的例子，我们排除了超对称Q球DM在参数空间互补的地球边界。我们把进一步的限制DM被捕获的白色矮星，考虑DM核心的形成和自引力坍缩加热星星通过衰变和湮灭的核心。同样有趣的是，在这项工作中讨论的DM引发的点火提供了一个替代机制，触发超新星从sub-Bracrasekhar，非二元祖先。
Dark matter that is capable of sufficiently heating a local region in a white dwarf will trigger runaway fusion and ignite a type Ia supernova. This was originally proposed in Graham et al. (2015) and used to constrain primordial black holes which transit and heat a white dwarf via dynamical friction. In this paper, we consider dark matter (DM) candidates that heat through the production of high-energy standard model (SM) particles, and show that such particles will efficiently thermalize the white dwarf medium and ignite supernovae. Based on the existence of long-lived white dwarfs and the observed supernovae rate, we derive new constraints on ultra-heavy DM which produce SM particles through DM-DM annihilations, DM decays, and DM-SM scattering interactions in the stellar medium. As a concrete example, we rule out supersymmetric Q-ball DM in parameter space complementary to terrestrial bounds. We put further constraints on DM that is captured by white dwarfs, considering the formation and self-gravitational collapse of a DM core which heats the star via decays and annihilations within the core. It is also intriguing that the DM-induced ignition discussed in this work provide an alternative mechanism of triggering supernovae from sub-Chandrasekhar, non-binary progenitors.