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arXiv 2201.02317hep-phastro-ph.CO
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类轴子暴胀后非阿贝尔再加热的引力波背景

Gravitational wave background from non-Abelian reheating after axion-like inflation

P. Klose, M. Laine, S. Procacci

摘要:

赝标暴胀子$φ$与非阿贝尔扇区的拓扑电荷密度$F\tilde{F}$耦合,可以衰变为规范玻色子($φ\to g g $),它可以迅速热化。$φ$感受到的摩擦力随后被非阿贝尔的"强sphaleron"增加,导致能够有效地加热介质的自放大过程。我们确定了一个下限的引力波生产率从这样一个过程中,起源于流体动力学波动和粒子碰撞,在最小数量的参数。只有中等比例的能量密度被转换为引力波,这表明非阿贝尔模型可能避免在某些阿贝尔情况下观察到的过度生产。

英文摘要:

A pseudoscalar inflaton $φ$, coupled to the topological charge density $F\tilde{F}$ of a non-Abelian sector, can decay to gauge bosons ($φ\to g g $), which may thermalize rapidly. The friction felt by $φ$ is then increased by non-Abelian "strong sphalerons", leading to a self-amplifying process that can efficiently heat up the medium. We determine a lower bound for the gravitational wave production rate from such a process, originating via hydrodynamic fluctuations and particle collisions, in terms of a minimal number of parameters. Only a moderate fraction of energy density is converted to gravitational waves, suggesting that non-Abelian models may avoid the overproduction observed in some Abelian cases.

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