论文标题
探测中微子相互作用和引力波的深色辐射
Probing neutrino interactions and dark radiation with gravitational waves
论文作者
论文摘要
一代之后，引力波的宇宙学背景几乎自由地传播，但对于宇宙的扩展和自由流颗粒的各向异性应力。原始信号 - 既来自通货膨胀和与次级生产机制相关的红外光谱的信号 - 都将带有有关这些作用的宇宙学历史的简洁信息。我们研究了由于相互作用的解耦（或重新耦合）引起的自由流辐射，研究重力波的标准阻尼的调节。我们专注于弱相互作用解耦后实际上有效的非标准中微子相互作用，以及涉及其他光文的早期宇宙中更一般的场景。我们在完全自由流的场景中开发了半分析结果，以提供数值结果的直觉，这些结果将相互作用速率与各种诱发依赖性结合在一起。最后，我们计算了宇宙微波背景上$ b $ mode极化上中微子相互作用的烙印，并评论其他方法，以推断出较高频率的这种效果。
After their generation, cosmological backgrounds of gravitational waves propagate nearly freely but for the expansion of the Universe and the anisotropic stress of free-streaming particles. Primordial signals -- both that from inflation and the infrared spectrum associated to subhorizon production mechanisms -- would carry clean information about the cosmological history of these effects. We study the modulation of the standard damping of gravitational waves by free-streaming radiation due to the decoupling (or recoupling) of interactions. We focus on nonstandard neutrino interactions in effect after the decoupling of weak interactions as well as more general scenarios in the early Universe involving other light relics. We develop semianalytic results in fully free-streaming scenarios to provide intuition for numerical results that incorporate interaction rates with a variety of temerpature dependencies. Finally, we compute the imprint of neutrino interactions on the $B$-mode polarization of the cosmic microwave background, and we comment on other means to infer the presence of such effects at higher frequencies.
