原初引力波的传播速度与暴胀
宇宙学与河外天体物理
2016-08-10 v3 广义相对论与量子宇宙学
高能物理 - 理论
摘要
我们表明,若引力波(GWs)的传播速度在暴胀期间逐渐减小,则原初引力波的功率谱将呈强蓝倾斜,而原初标量扰动的功率谱可能不受影响。我们还说明此种情形实际上是超暴胀(superinflation)的形变对偶(disformal dual),但其不存在鬼场不稳定性。所得的蓝倾斜为 ,这可能显著增强 Advanced LIGO/Virgo 频带以及空间探测器上的随机引力波背景。
引用
@article{arxiv.1602.05431,
title = {Propagating speed of primordial gravitational waves and inflation},
author = {Yong Cai and Yu-Tong Wang and Yun-Song Piao},
journal= {arXiv preprint arXiv:1602.05431},
year = {2016}
}
备注
18 pages, 4 figures; published version in PRD; two appendixes were moved to the main body; references and comments added, presentation improved