空间封闭宇宙学中张量模的阻尼
Damping of tensor mode in spatially closed cosmology
摘要：
我们导出了空间封闭宇宙学中宇宙引力波传播的积分微分方程，而各向异性应力张量中的无痕横向张量部分是自由流中微子（包括反中微子），它们在温度降到约$ 10^{10} K$以下时基本上没有发生碰撞。我们研究了闭合时空中进入视界的引力波的短波长和长波长。该解决方案表明，各向异性应力减少了76%的平方振幅的波长进入地平线在辐射为主的阶段，这种减少是较小的波长进入地平线在以后的时间。最后，我们将结果与
英文摘要：
We derive an integro-differential equation for propagation of cosmological gravitation waves in spatially closed cosmology whereas the traceless transverse tensor part of the anisotropic stress tensor is free streaming neutrinos (including antineutrinos), which have been traveling essentially without collision since temperature dropped below about $ 10^{10} K$. We studied the short wavelengths and long wavelengths of gravitational waves (GWs) that enter the horizon in closed spacetime. The solution shows that the anisotropic stress reduces the squared amplitude by 76% for wavelengths that enter the horizon during radiation-dominated phase and this reduction is less for the wavelength that enter the horizon at later times. At the end we compare the results to the
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