Anisotropies in the gravitational wave background from preheating.
Anisotropies in the gravitational wave background from preheating.
复制标题
DOI：
10.1103/physrevlett.111.011301
复制
发表时间：
2013-04
影响因子：
8.6
通讯作者：
L. Bethke;Daniel G. Figueroa;A. Rajantie
中科院分区：
文献类型：
--
作者：
L. Bethke;Daniel G. Figueroa;A. Rajantie
我们研究了膨胀后预热产生的引力波（GW）背景的各向异性。利用无质量预热模型的晶格场理论模拟，我们发现GW振幅敏感地依赖于与膨胀子φ耦合的衰变积场χ的值，唯一的条件是膨胀时χ是轻的。我们发现在大角度尺度上，GW背景的振幅具有很强的各向异性，其细节很大程度上取决于再加热动力学。我们期望类似的结论适用于具有轻标量场的大范围暴胀模型。如果未来的直接探测GW实验能够探测到由预热产生的GW，他们也应该能够探测到这种效应。这可能最终为区分不同的暴胀和预热情景提供一种强有力的方法。
We investigate the anisotropies in the gravitational wave (GW) background produced at preheating after inflation. Using lattice field theory simulations of a massless preheating model, we show that the GW amplitude depends sensitively on the value of the decay product field χ coupled to the inflaton φ, with the only requisite that χ is light during inflation. We find a strong anisotropy in the amplitude of the GW background on large angular scales, the details of which strongly depend on the reheating dynamics. We expect similar conclusions for a wide class of inflationary models with light scalar fields. If future direct detection GW experiments are capable of detecting the GW produced by preheating, they should also be able to detect this effect. This could eventually provide a powerful way to distinguish between different inflationary and preheating scenarios.