标题： 四极功率辐射由德西特背景中的双星系统 显示英文标题

标题： Quadrupolar power radiation by a binary system in de Sitter Background

摘要： 宇宙学观测在过去几十年中支持我们的宇宙具有微小的正宇宙学常数。 宇宙学常数的存在不仅在引力波物理中带来理论挑战，也具有观测相关性。 在引力波的线性化理论中包含宇宙学常数会修改四极矩辐射功率公式。 有两种观测可能受到修改后的四极矩公式的影响。 一种是旋进双星系统的轨道衰减，另一种是探测器处波形的修改。 在德西特背景上对椭圆轨道的致密双星系统进行建模，我们得到了由于引力波发射而产生的能量和角动量辐射。 我们还研究了在反作用下的轨道参数演化及其对轨道衰减率的影响。 在趋于圆轨道的极限情况下，我们的结果与参考文献[26]中得到的结果一致。 显示英文摘要

摘要： Cosmological observations over past couple of decades favor our universe with a tiny positive cosmological constant. Presence of cosmological constant not only imposes theoretical challenges in gravitational wave physics, it has also observational relevance. Inclusion of cosmological constant in linearized theory of gravitational waves modifies the power radiated quadrupole formula. There are two types of observations which can be impacted by the modified quadrupole formula. One is the orbital decay of an inspiraling binary and other is the modification of the waveform at the detector. Modelling a compact binary system in an elliptic orbit on de Sitter background we obtain energy and angular momentum radiation due to emission of gravitational waves. We also investigate evolution of orbital parameters under back reaction and its impact on orbital decay rate. In the limit to circular orbit our result matches to that obtained in ref. [26].