Phase transition during inflation and the gravitational wave signal at pulsar timing arrays
Phase transition during inflation and the gravitational wave signal at pulsar timing arrays
复制标题
暴胀期间的相变和脉冲星计时阵列的引力波信号
作者：
H. An;Boye Su;Hanwen Tai;Lian;Chen Yang
引力波信号为了解早期宇宙的动力学提供了一个有希望的窗口。脉冲星定时阵列（PTA）的最新结果可能是这种新物理学的首次亮相。特别是，他们可以指出通货膨胀期间的新细节，而这些细节无法通过其他方式探究。我们探讨了新结果可能来自曲率扰动产生的次级引力波的可能性，曲率扰动是由暴涨期间的一阶相变产生的。基于相变过程的场论晶格模拟结果，我们表明通过这种机制产生的引力波信号可以解释 PTA 的新结果。我们详细分析信号的频谱形状。未来的观测可以使用这些信息来区分这里考虑的引力波信号与其他可能的来源。
Gravitational wave signal offers a promising window into the dynamics of the early universe. The recent results from pulsar timing arrays (PTAs) could be the first glimpse of such new physics. In particular, they could point to new details during the inflation, which can not be probed by other means. We explore the possibility that the new results could come from the secondary gravitational wave sourced by curvature perturbations, generated by a first-order phase transition during the inflation. Based on the results of a field-theoretic lattice simulation of the phase transition process, we show that the gravitational wave signal generated through this mechanism can account for the new results from the PTAs. We analyze the spectral shape of the signal in detail. Future observations can use such information to distinguish the gravitational wave signal considered here from other possible sources.
影响因子：
6.4
作者：
C. Byrnes;P. S. Cole;S. Patil
通讯作者：
C. Byrnes;P. S. Cole;S. Patil