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首页> 外文期刊>Prog. Theor. Exp. Phys. >Multiband gravitational-wave astronomy: Observing binary inspirals with a decihertz detector, B-DECIGO
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Multiband gravitational-wave astronomy: Observing binary inspirals with a decihertz detector, B-DECIGO

机译：多波段引力波天文学：用分贝探测器B-DECIGO观测二元吸气

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An evolving Japanese gravitational-wave (GW) mission in the decihertz band, B-DECIGO (DECihertz laser Interferometer Gravitational wave Observatory), will enable us to detect GW150914-like binary black holes, GW170817-like binary neutron stars, and intermediate-mass binary black holes out to cosmological distances. The B-DECIGO band slots in between the aLIGO–Virgo–KAGRA–IndIGO (hectohertz) and LISA (millihertz) bands for broader bandwidth; the sources described emit GWs for weeks to years across the multiple bands to accumulate high signal-to-noise ratios. This suggests the possibility that joint detection would greatly improve the parameter estimation of the binaries. We examine B-DECIGO’s ability to measure binary parameters and assess to what extent multiband analysis could improve such measurement. Using non-precessing post-Newtonian waveforms with the Fisher matrix approach, we find for systems like GW150914 and GW170817 that B-DECIGO can measure the mass ratio to within |$ 0.1%$|?, the individual black-hole spins to within |$ 10%$|?, and the coalescence time to within |$ 5,$|s about a week before alerting aLIGO and electromagnetic facilities. Prior information from B-DECIGO for aLIGO can further reduce the uncertainty in the measurement of, e.g., certain neutron star tidally induced deformations by a factor of |$sim$|6, and potentially determine the spin-induced neutron star quadrupole moment. Joint LISA and B-DECIGO measurement will also be able to recover the masses and spins of intermediate-mass binary black holes at percent-level precision. However, there will be a large systematic bias in these results due to post-Newtonian approximation of exact GW signals.
机译：B-DECIGO（十赫兹激光干涉仪引力波天文台）在十赫兹波段中不断发展的日本重力波（GW）任务，将使我们能够检测出类似于GW150914的双黑洞，类似于GW170817的双中子星以及中等质量的中子二进制黑洞到宇宙学距离。 B-DECIGO频段位于aLIGO-Virgo-KAGRA-IndIGO（百赫兹）和LISA（毫赫兹）之间，以获得更宽的带宽;所描述的消息来源在多个频段上发射了数周至数年的GW，从而积累了很高的信噪比。这表明联合检测将大大改善二进制文件的参数估计的可能性。我们检查了B-DECIGO测量二进制参数的能力，并评估了多频带分析可以在多大程度上改善这种测量。使用非先验后牛顿波形和费舍尔矩阵方法，我们发现对于GW150914和GW170817等系统，B-DECIGO可以测量质量比在| $ <0.1 ％$ |？以内，各个黑洞自旋为在| $ <10 ％$ |？之内，并且聚结时间在| $ <5 ，$ | s之内，大约在向aLIGO和电磁设施发出警报之前。来自B-DECIGO的关于aLIGO的先验信息可以进一步降低某些中子星潮汐诱发的变形测量​​的不确定性|| sim || 6，并有可能确定自旋诱发的中子星四极矩。 LISA和B-DECIGO的联合测量也将能够以百分比级的精度恢复中等质量二进制黑洞的质量和自旋。然而，由于精确GW信号的牛顿后近似，这些结果将存在很大的系统偏差。

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