Dark, cold, and noisy: constraining secluded hidden sectors with gravitational waves
Dark, cold, and noisy: constraining secluded hidden sectors with gravitational waves
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DOI：
10.1088/1475-7516/2019/07/007
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发表时间：
2018-11
影响因子：
6.4
通讯作者：
M. Breitbach;J. Kopp;E. Madge;Toby Opferkuch;P. Schwaller
中科院分区：
文献类型：
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作者：
M. Breitbach;J. Kopp;E. Madge;Toby Opferkuch;P. Schwaller
我们研究了隐蔽扇区中发生的一阶相变产生的引力波信号，考虑到隐藏扇区可能具有与标准模型扇区不同的温度。我们以一种与模型无关的方式展示了当前和未来引力波探测器对这种情况的敏感性。由于隐蔽的隐藏扇区对MeV或以下的暗物质模型特别感兴趣，我们特别关注脉冲星计时阵列的覆盖范围。对光自由度的宇宙学限制限制了隐藏扇区中亚MeV粒子的数量，以及隐藏扇区的温度。然而，我们发现可以发生可观测的一阶相变。为了说明我们的结果，我们考虑了两个最小基准模型：一个是具有两个规范单重态标量的模型，另一个是在隐区自发破坏U(1)规范对称性的模型。
We explore gravitational wave signals arising from first-order phase transitions occurring in a secluded hidden sector, allowing for the possibility that the hidden sector may have a different temperature than the Standard Model sector. We present the sensitivity to such scenarios for both current and future gravitational wave detectors in a model-independent fashion. Since secluded hidden sectors are of particular interest for dark matter models at the MeV scale or below, we pay special attention to the reach of pulsar timing arrays. Cosmological constraints on light degrees of freedom restrict the number of sub-MeV particles in a hidden sector, as well as the hidden sector temperature. Nevertheless, we find that observable first-order phase transitions can occur. To illustrate our results, we consider two minimal benchmark models: a model with two gauge singlet scalars and a model with a spontaneously broken U(1) gauge symmetry in the hidden sector.