Parametric resonance after hilltop inflation caused by an inhomogeneous inflaton field
Parametric resonance after hilltop inflation caused by an inhomogeneous inflaton field
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非均匀暴胀场引起的山顶暴胀后的参量共振
DOI：
10.1088/1475-7516/2016/02/044
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发表时间：
2015
影响因子：
6.4
通讯作者：
S. Orani
中科院分区：
文献类型：
--
作者：
S. Antusch;F. Cefalá;David Nolde;S. Orani
我们研究了山顶膨胀后的预热，其中暴胀子耦合到另一个标量场，例如右手中微子，这提供了一种机制，用于生成正确的初始条件的通货膨胀和也是一个衰变通道的暴胀子，允许再加热和非热leptogenesis。在这种耦合的存在下，我们发现，在快子预热和快子振荡的阶段，在此期间的暴胀子场变得不均匀，可以有一个后续的预热阶段，在那里的波动的其他字段得到共振增强，从初始真空波动的幅度相同的顺序（甚至更大）的暴胀子场。这种共振增强不同于通常的参数共振，因为暴胀子场在增强发生时是不均匀的。我们研究这种效果，使用晶格模拟以及半解析与广义Floquet分析不均匀的背景场。
We study preheating after hilltop inflation where the inflaton couples to another scalar field, e.g. a right-handed sneutrino, which provides a mechanism for generating the correct initial conditions for inflation and also a decay channel for the inflaton that allows for reheating and non-thermal leptogenesis. In the presence of such a coupling, we find that after the phases of tachyonic preheating and tachyonic oscillations, during which the inflaton field becomes inhomogeneous, there can be a subsequent preheating phase where the fluctuations of the other field get resonantly enhanced, from initial vacuum fluctuations up to amplitudes of the same order (and even larger) as the ones of the inflaton field. This resonant enhancement differs from the usual parametric resonance as the inflaton field is inhomogeneous at the time the enhancement takes place. We study this effect using lattice simulations as well as semi-analytically with a generalized Floquet analysis for inhomogeneous background fields.