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arXiv 2209.07693astro-ph.COgr-qc
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原初标量与张量扰动产生的引力波

Gravitational waves from primordial scalar and tensor perturbations

Zhe Chang, Xukun Zhang, Jing-Zhi Zhou

AI总结:

本文研究辐射主导时期原初标量和张量扰动诱导的二阶引力波,给出功率谱显式表达式,并发现当张标比为0.2时,原初张量扰动可使LISA观测信噪比提高约50%。

摘要:

我们研究了辐射主导时期由原初标量和张量扰动诱导的二阶引力波。给出了二阶引力波功率谱的显式表达式。我们计算了单色原初功率谱下二阶引力波的能量密度谱。对于大 $k$ $\left( k>k_* \right)$,在张标比 $r=A_{h}/A_ζ=0.2$ 的原初张量扰动影响下,LISA 观测的信噪比(SNR)提高了约 $50\\%$。

英文摘要:

We investigate the second order gravitational waves induced by the primordial scalar and tensor perturbations during radiation-dominated era. The explicit expressions of the power spectra of the second order GWs are presented. We calculate the energy density spectra of the second order GWs for a monochromatic primordial power spectra. For large $k$ $\left( k>k_* \right)$, the effects of the primordial tensor perturbation with tensor-to-scalar ratio $r=A_{h}/A_ζ=0.2$ lead to an around $50\% $ increase of the signal-to-noise ratio (SNR) for LISA observations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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