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arXiv 1803.08062hep-phastro-ph.CO
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自食暗物质与大尺度结构

Cannibal Dark Matter and Large Scale Structure

Manuel A. Buen-Abad, Razieh Emami, Martin Schmaltz

摘要:

食人族是暗物质粒子,其散射过程允许三个粒子湮灭为两个。这个放热过程使剩余粒子的气体在它们变得非相对论性之后很长一段时间保持温暖。一个与标准模型脱钩的蚕食暗扇区自然产生于一个纯胶限制的隐藏扇区。它有一个有效场论的描述与一个单一的质量相互作用的真正的标量场,最轻的胶球。由于温暖的暗物质强烈抑制结构的生长,食人族不可能是所有的暗物质。因此,我们提出了一个方案,其中大多数暗物质是非相互作用和冷,但约1%是同类相食。我们回顾了食人族对温度、能量和数密度与红移的不寻常标度,并将物质密度微扰增长方程推广到食人族的情况。我们数值求解方程预测的哈勃参数的缩放和线性物质功率谱的特征形状作为模型参数的函数。我们的研究结果可能对$σ_8$和$H_0$问题有意义。

英文摘要:

Cannibals are dark matter particles with a scattering process that allows three particles to annihilate to two. This exothermic process keeps the gas of the remaining particles warm long after they become non-relativistic. A cannibalizing dark sector which is decoupled from the Standard Model naturally arises from a pure-glue confining hidden sector. It has an effective field theory description with a single massive interacting real scalar field, the lightest glueball. Since warm dark matter strongly suppresses growth of structure cannibals cannot be all of the dark matter. Thus we propose a scenario where most dark matter is non-interacting and cold but about 1 percent is cannibalistic. We review the cannibals' unusual scaling of the temperature and energy and number densities with redshift and generalize the equations for the growth of matter density perturbations to the case of cannibals. We solve the equations numerically to predict the scaling of the Hubble parameter and the characteristic shape of the linear matter power spectrum as a function of model parameters. Our results may have implications for the $σ_8$ and $H_0$ problems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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