Gravitational waves from gauge preheating
Gravitational waves from gauge preheating
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DOI：
10.1103/physrevd.98.043525
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发表时间：
2018-08-24
影响因子：
5
通讯作者：
Weiner, Zachary J.
中科院分区：
文献类型：
--
作者：
Adshead, Peter;Giblin, John T., Jr.;Weiner, Zachary J.
研究了膨胀后阿贝尔规范场预热过程中引力波的产生。我们考虑标量和伪标量膨胀模型通过与规范场动力学项的扩张耦合或与chen - simons项的轴向耦合直接耦合到阿贝尔规范场。在这两种情况下，引力波都是在预热阶段有效产生的，其信号比大多数宇宙信号都要响亮。这些引力波可以在一定程度上贡献宇宙的辐射能量收支，这将由即将通过N-eff进行的宇宙微波背景实验来探测。对于轴向耦合场，产生的引力波频谱是螺旋极化的，这是一个独特的特征，可以用来区分它与其他随机引力波背景。我们计算了引力拓扑电荷，并证明了轴子膨胀后的规范预热可能是通过引力轻生导致宇宙物质-反物质不对称的原因。
We study gravitational wave production during Abelian gauge-field preheating following inflation. We consider both scalar and pseudoscalar inflaton models coupled directly to Abelian gauge fields via either a dilatonic coupling to the gauge-field kinetic term or an axial coupling to a Chern-Simons term. In both cases gravitational waves are produced efficiently during the preheating phase, with a signature louder than most cosmological signals. These gravitational waves can contribute to the radiation energy budget of Universe at a level which will be probed by upcoming cosmic microwave background experiments through N-eff. For axially coupled fields the resulting gravitational wave spectrum is helically polarized-a unique feature that can be used to differentiate it from other stochastic gravitational wave backgrounds. We compute the gravitational topological charge and demonstrate that gauge preheating following axion inflation may be responsible for the matter-antimatter asymmetry of the Universe via gravitational leptogenesis.