B modes from postinflationary gravitational waves sourced by axionic instabilities at cosmic reionization
B modes from postinflationary gravitational waves sourced by axionic instabilities at cosmic reionization
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来自宇宙再电离轴子不稳定性的膨胀后引力波的 B 模式
DOI：
10.1103/physrevd.104.083517
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发表时间：
2021
影响因子：
5
通讯作者：
Tsai, Yuhsin
中科院分区：
文献类型：
--
作者：
Geller, Michael;Lu, Sida;Tsai, Yuhsin
我们发现，轴子粒子，只耦合到不可见的暗光子可以产生周围的再电离时代的单模信号。轴子场在再电离前不久开始滚动，导致暗光子的快子不稳定性。这产生了一个指数增长的暗光子量子源标量度规模式和引力波留下的印记，再电离重子。张量模式修改宇宙微波背景（CMB）在再电离的偏振，生成的参数范围内，满足当前的实验约束的下一代CMB实验的unblemode签名。
We show that axionlike particles that only couple to invisible dark photons can generate visiblemode signals around the reionization epoch. The axion field starts rolling shortly before reionization, resulting in a tachyonic instability for the dark photons. This generates an exponential growth of the dark photon quanta sourcing both scalar metric modes and gravitational waves that leave an imprint on the reionized baryons. The tensor modes modify the cosmic microwave background (CMB) polarization at reionization, generating visiblemode signatures for the next generation of CMB experiments for parameter ranges that satisfy the current experimental constraints.