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arXiv 1609.07142astro-ph.COastro-ph.GAgr-qc
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用LISA和哈勃张力进行引力波宇宙学

Gravitational-wave cosmography with LISA and the Hubble tension

Koutarou Kyutoku, Naoki Seto

摘要:

我们认为,在激光干涉空间天线(LISA)时代,像GW 150914这样的恒星质量双星黑洞将成为探索100 Mpc以内局域宇宙的工具。在适度乐观的假设下,LISA的高校准精度和每年的运动使我们能够比没有电磁对应物的~ 100 Mpc^3的误差量更精确地定位多达60个双星。这样的精确度将使我们有一个很好的机会仅凭引力波就能确定主天体。通过结合从引力波中提取的光度距离和从宿主中确定的宇宙学红移,可以确定哈勃参数的局部值,而不依赖于经验构造的距离阶梯。引力波宇宙学将为解决有争议的哈勃张力铺平道路,其中局部和全球测量在3.4西格玛水平上的哈勃参数值不一致,约为9%。

英文摘要:

We propose that stellar-mass binary black holes like GW150914 will become a tool to explore the local Universe within ~100Mpc in the era of the Laser Interferometer Space Antenna (LISA). High calibration accuracy and annual motion of LISA could enable us to localize up to ~60 binaries more accurately than the error volume of ~100Mpc^3 without electromagnetic counterparts under moderately optimistic assumptions. This accuracy will give us a fair chance to determine the host object solely by gravitational waves. By combining the luminosity distance extracted from gravitational waves with the cosmological redshift determined from the host, the local value of the Hubble parameter will be determined up to a few % without relying on the empirically constructed distance ladder. Gravitational-wave cosmography would pave the way for resolution of the disputed Hubble tension, where the local and global measurements disagree in the value of the Hubble parameter at 3.4sigma level, which amounts to ~9%.

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