arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.14688astro-ph.COhep-ph
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自相互作用暗物质的再生冻结

Reproductive Freeze-In of Self-Interacting Dark Matter

John March-Russell, Hannah Tillim, Stephen M. West

摘要:

我们提出了一种暗物质(DM)产生的机制,涉及一个自相互作用的部门,在早期是超相对论的,但远远不足的相对于热平衡(这种初始条件经常出现,例如,从暴胀子衰变)。虽然弹性散射可以建立动力学平衡,我们表明,对于各种各样的自相互作用完全平衡是从来没有建立,尽管DM产量显着演变由于$2\to k$($k>2$)过程(DM携带没有保守的量子数,也不对称)。在该过程的活跃阶段,DM与标准模型的温度比迅速下降,DM动能转化为DM质量,这与最近讨论的“食人DM机制”相反。潜在的观测和应用包括星系和星系团中的自相互作用DM签名,暗声振荡,自由流约束的改变,以及可能缓解$σ_8$和哈勃紧张局势。

英文摘要:

We present a mechanism for dark matter (DM) production involving a self-interacting sector that at early times is ultra-relativistic but far-underpopulated relative to thermal equilibrium (such initial conditions often arise, e.g., from inflaton decay). Although elastic scatterings can establish kinetic equilibrium we show that for a broad variety of self-interactions full equilibrium is never established despite the DM yield significantly evolving due to $2\to k$ ($k>2$) processes (the DM carries no conserved quantum number nor asymmetry). During the active phase of the process, the DM to Standard Model temperature ratio falls rapidly, with DM kinetic energy being converted to DM mass, the inverse of the recently-discussed `cannibal DM mechanism'. Potential observables and applications include self-interacting DM signatures in galaxies and clusters, dark acoustic oscillations, the alteration of free-streaming constraints, and possible easing of $σ_8$ and Hubble tensions.

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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