We study preheating in plateau inflation in the Palatini formulation of general relativity, in a special case that resembles Higgs inflation. It was previously shown that the oscillating inflaton field returns to the plateau repeatedly in this model, and this leads to tachyonic production of inflaton particles. We show that a minimally coupled spectator scalar field can be produced even more efficiently by a similar mechanism. The mechanism is purely gravitational, and the scalar field mass can be of order 10¹³ GeV, larger than the Hubble scale by many orders of magnitude, making this a candidate for superheavy darkmatter.

中文翻译：

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帕拉蒂尼预热中的引力暗物质产生

我们在广义相对论的帕拉蒂尼公式中研究了高原暴胀中的预热，这是一种类似于希格斯暴胀的特殊情况。之前的研究表明，在这个模型中，振荡的暴胀子场反复返回到高原，这导致暴胀子粒子的快速产生。我们表明，通过类似的机制可以更有效地产生最小耦合的旁观者标量场。该机制纯粹是引力，标量场质量可以达到 10 ¹³ GeV，比哈勃尺度大许多数量级，使其成为超重暗物质的候选者。