论文标题
通过不均匀的背景传播的引力波的粘性衰减
Viscous attenuation of gravitational waves propagating through an inhomogeneous background
论文作者
论文摘要
我们认为在存在物质分布不均匀性的情况下，在晚期宇宙中引力波的传播，我们还认为宇宙流体是粘性的。在这项工作中，我们研究了宇宙流体对与重力波来源相关的可观察物的不均匀性和粘度的累积效应。我们在反应框架中采用Buchert的平均过程，我们考虑了一个时空模型，其中物质在跨空间中分配。通过模型上下文中的平均过程，我们使用修改的红移与距离关系，我们研究了观察到的重力波振幅的红移依赖性部分的变化，用于我们的模型参数的不同组合，同时考虑由于cosmic-Fuluid的粘度而导致的引力振幅受阻。然后，我们研究了由于考虑粘性衰减而导致观察到的重力波幅度的红移依赖部分变化中发生的差异。我们表明，根据粘度系数的选择值，在分析中包含粘性衰减后存在明显偏差。我们的结果表明，在不均匀宇宙模型中，粘度的影响对重力二元源的参数的精确测量。
We consider the propagation of gravitational waves in the late-time Universe in the presence of matter distribution inhomogeneities, and we also consider the cosmic fluid to be viscous. In this work, we investigate the cumulative effect of inhomogeneities and viscosity of the cosmic-fluid on the observables associated with the sources of the gravitational waves. Employing Buchert's averaging procedure in the backreaction framework, we consider a model of spacetime in which matter is distributed in-homogeneously across space. Using the modified redshift versus distance relation, through the averaging process in the context of the model, we study the variation of the redshift-dependent part of the observed gravitational wave amplitude for different combinations of our model parameters while simultaneously considering damping of the gravitational wave amplitude due to viscosity of the cosmic-fluid. Then, we investigate the differences occurring in the variation of the redshift-dependent part of the observed gravitational wave amplitude due to consideration of viscous attenuation. We show that there are significant deviations after the inclusion of viscous attenuation in our analysis, depending on the chosen value of the coefficient of viscosity. Our result signifies the importance of the effect of viscosity, within the model of an inhomogeneous Universe, on precision measurements of parameters of compact-binary sources of gravitational waves.
