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arXiv 1506.04048astro-ph.COhep-ph
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暗物质的暴胀印记

Inflationary Imprints on Dark Matter

Sami Nurmi, Tommi Tenkanen, Kimmo Tuominen

摘要:

我们发现,暗物质丰度和膨胀尺度$H$可能是密切相关的。标准模型的扩展与希格斯介导的耦合到新的物理通常包含额外的标量从真空中取代在膨胀。如果它们与标准模型的耦合很弱,它们就不会热化,并且很容易构成太多的暗物质,让人想起模量问题。作为一个例子,我们考虑标准模型扩展的$Z_2$对称单线$s$耦合到标准模型希格斯$Φ$通过$λΦ^†Φs^2$。对于$λ\lesssim 10^{-7}$来说,暗物质遗迹密度是非热产生的。我们表明,暗物质产量关键取决于暴胀规模。对于$H\sim 10^{10}$ GeV,我们发现,单重态自耦合和质量应该位于制度$λ_{\rm s}\gtrsim 10^{-9}$和$m_{\rm s}\lesssim 50$ GeV,以避免暗物质生产过剩。

英文摘要:

We show that dark matter abundance and the inflationary scale $H$ could be intimately related. Standard Model extensions with Higgs mediated couplings to new physics typically contain extra scalars displaced from vacuum during inflation. If their coupling to Standard Model is weak, they will not thermalize and may easily constitute too much dark matter reminiscent to the moduli problem. As an example we consider Standard Model extended by a $Z_2$ symmetric singlet $s$ coupled to the Standard Model Higgs $Φ$ via $λΦ^†Φs^2$. Dark matter relic density is generated non-thermally for $λ\lesssim 10^{-7}$. We show that the dark matter yield crucially depends on the inflationary scale. For $H\sim 10^{10}$ GeV we find that the singlet self-coupling and mass should lie in the regime $λ_{\rm s}\gtrsim 10^{-9}$ and $m_{\rm s}\lesssim 50$ GeV to avoid dark matter overproduction.

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