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arXiv 1502.06506astro-ph.CO
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规范预热和轴子膨胀的终结

Gauge-preheating and the end of axion inflation

Peter Adshead, John T. Giblin, Timothy R. Scully, Evangelos I. Sfakianakis

摘要:

我们研究了轴子驱动暴胀结束时的再加热阶段的开始,其中轴子通过Chern-Simons相互作用项耦合到阿贝尔,$U(1)$,规范场。我们主要集中在$m^2ϕ^2$通货膨胀和探索的可能性,预热可以发生的耦合值范围内与最近的观察和界限上的原始黑洞的生产过剩。我们发现,在很宽的参数范围内,预热是有效的。在某些情况下,暴胀子在几次振荡内就把它所有的能量转移到规范场。在大多数情况下,我们发现亚视界尺度上的规范场由于暴胀子模和规范场模之间存在强的再散射而在非偏振态下结束预热。我们还提出了一个初步的研究耦合到$U(1)$规范场的轴子monodromy模型,看到一个类似的有效的预热行为,以及迹象表明,耦合强度有影响的创建pupons。

英文摘要:

We study the onset of the reheating epoch at the end of axion-driven inflation where the axion is coupled to an Abelian, $U(1)$, gauge field via a Chern-Simons interaction term. We focus primarily on $m^2ϕ^2$ inflation and explore the possibility that preheating can occur for a range of coupling values consistent with recent observations and bounds on the overproduction of primordial black holes. We find that for a wide range of parameters preheating is efficient. In certain cases the inflaton is seen to transfer all its energy to the gauge fields within a few oscillations. In most cases, we find that the gauge fields on sub-horizon scales end preheating in an unpolarized state due to the existence of strong rescattering between the inflaton and gauge-field modes. We also present a preliminary study of an axion monodromy model coupled to $U(1)$ gauge fields, seeing a similarly efficient preheating behavior as well as indications that the coupling strength has an effect on the creation of oscillons.

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