论文标题
快速预热从非扰动产生费米的暗物质
Non-perturbative production of fermionic dark matter from fast preheating
论文作者
论文摘要
我们研究了早期宇宙中费米金暗物质的非扰动生产。我们通过分析性研究重力生产机制，并伴随着费米子与背景充气场的耦合。后者会导致预热过程中有效费米的变化，并使所得的光谱和丰度对其参数敏感。假设快速预热的速度少于通货膨胀时间的通货膨胀时间少，并且通货膨胀后没有充气场的振荡，我们发现颗粒的大量产生的能量从通货膨胀的哈勃速率到预热的反相反持续时间。产生的费米子可以在广泛的参数中解释所有观察到的暗物质。作为我们分析的应用，我们研究了Palatini Higgs膨胀模型中重型主要中微子的非扰动产生。
We investigate non-perturbative production of fermionic dark matter in the early universe. We study analytically the gravitational production mechanism accompanied by the coupling of fermions to the background inflaton field. The latter leads to the variation of effective fermion mass during preheating and makes the resulting spectrum and abundance sensitive to its parameters. Assuming fast preheating that completes in less than the inflationary Hubble time and no oscillations of the inflaton field after inflation, we find an abundant production of particles with energies ranging from the inflationary Hubble rate to the inverse duration of preheating. The produced fermions can account for all observed dark matter in a broad range of parameters. As an application of our analysis, we study non-perturbative production of heavy Majorana neutrino in the model of Palatini Higgs inflation.
