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arXiv 2006.03450gr-qc
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标量诱导引力波的规范变换

Gauge transformation of scalar induced gravitational waves

Yizhou Lu, Arshad Ali, Yungui Gong, Jiong Lin, Fengge Zhang

摘要:

二阶标量诱导引力波(SIGW)的规范依赖性对标量微扰产生的次级引力波的讨论提出了挑战。给出了一个适用于任何规范的计算单重态引力波的一般公式,以及在坐标变换下各种规范下计算的单重态引力波之间的关系。利用牛顿规范与其他规范的关联公式计算了六种不同规范下的单重态引力波。我们发现牛顿规范、均匀曲率规范、同步规范和均匀膨胀规范对单光子晶体的能量密度的结果是一致的。我们还确定和消除纯规范模式中存在的同步规范。在全物质规范和共动正交规范中,单光子Ws的能量密度按$η^2$增加。而在均匀密度规范中,SIGW的能量密度以$η^6$的形式增加。

英文摘要:

The gauge dependence of the scalar induced gravitational waves (SIGWs) generated at the second order imposes a challenge to the discussion of the secondary gravitational waves generated by scalar perturbations. We provide a general formula that is valid in any gauge for the calculation of SIGWs and the relationship for SIGWs calculated in various gauges under the coordinate transformation. The formula relating SIGWs in the Newtonian gauge to other gauges is used to calculate SIGWs in six different gauges. We find that the Newtonian gauge, the uniform curvature gauge, the synchronous gauge and the uniform expansion gauge yield the same result for the energy density of SIGWs. We also identify and eliminate the pure gauge modes that exist in the synchronous gauge. In the total matter gauge and the comoving orthogonal gauge, the energy density of SIGWs increases as $η^2$. While in the uniform density gauge, the energy density of SIGWs increases as $η^6$.

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