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arXiv 1708.04293astro-ph.COhep-ph
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超重暗物质通过希格斯门算子

Superheavy dark matter through Higgs portal operators

Rocky W. Kolb, Andrew J. Long

摘要:

WIMPzilla假说认为暗物质是一种超弱相互作用的超重粒子。传统上,WIMPzilla丰度由暴胀期间或结束时的引力粒子产生决定。在这项研究中,我们允许WIMPzilla通过希格斯门直接与标准模型场相互作用,并且我们计算了等离子体中希格斯玻色子对湮灭产生的WIMPzilla暗物质的热产生(冻结)。两个粒子物理模型参数是WIMPzilla质量和Higgs-WIMPzilla耦合。这两个宇宙学参数是再加热温度和膨胀结束时宇宙的膨胀率。我们划定的区域的参数空间,无论是重力或热生产占主导地位,在这些地区内,我们确定的参数,预测所观察到的暗物质遗迹丰度。允许热产生打开了参数空间,即使是普朗克抑制的希格斯-WIMPzilla相互作用。

英文摘要:

The WIMPzilla hypothesis is that the dark matter is a super-weakly-interacting and super-heavy particle. Conventionally, the WIMPzilla abundance is set by gravitational particle production during or at the end of inflation. In this study we allow the WIMPzilla to interact directly with Standard Model fields through the Higgs portal, and we calculate the thermal production (freeze-in) of WIMPzilla dark matter from the annihilation of Higgs boson pairs in the plasma. The two particle-physics model parameters are the WIMPzilla mass and the Higgs-WIMPzilla coupling. The two cosmological parameters are the reheating temperature and the expansion rate of the universe at the end of inflation. We delineate the regions of parameters space where either gravitational or thermal production is dominant, and within those regions we identify the parameters that predict the observed dark matter relic abundance. Allowing for thermal production opens up the parameter space, even for Planck-suppressed Higgs-WIMPzilla interactions.

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