论文标题
早期宇宙中热中微子的手性重力波
Chiral gravitational waves from thermalized neutrinos in the early Universe
论文作者
论文摘要
我们研究了早期宇宙中手性费米斯产生的极化引力波。特别是，我们专注于热平衡中左撇子中微子的贡献，并在辐射主导的时代有限温度和化学势。我们计算了与Stokes参数$ V $相关的引力场的相关函数，这些$ V $表征了Minkowski中引力波和扩展时空背景的圆形极化。在不断扩展的宇宙中，我们发现热中微子的热中微子诱导了长波长区域中中微子退化参数和重力波的波数。尽管热中微子产生的引力波的大小太小，无法被电流和计划的第三代重力波探测器检测到，但未来生成检测器对超高频率状态的观察可能会提供有关早期宇宙中核中性脱脂性参数的信息。
We investigate polarized gravitational waves generated by chiral fermions in the early Universe. In particular, we focus on the contribution from left-handed neutrinos in thermal equilibrium with finite temperature and chemical potential in the radiation dominated era. We compute the correlation functions of gravitational fields pertinent to the Stokes parameter $V$ characterizing the circular polarization of gravitational waves in the Minkowski and expanding spacetime backgrounds. In the expanding universe, we find that the thermalized neutrinos induce a non-vanishing $V$ linear to the neutrino degeneracy parameter and wavenumber of gravitational waves in the long wavelength region. While the magnitude of the gravitational waves generated by thermal neutrinos is too small to be detectable by current and planned third generation gravitational wave detectors, their observations by future generation detectors for ultra-high frequency regimes could provide information on the neutrino degeneracy parameter in the early Universe.
