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arXiv gr-qc/0209039gr-qc
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LISA最优灵敏度

The LISA Optimal Sensitivity

Thomas A. Prince, Massimo Tinto, Shane L. Larson, J. W. Armstrong

摘要:

激光干涉仪空间天线(LISA)上的多个多普勒读数允许同时形成几个干涉观测值。所有这些观测量都与激光频率涨落无关,并且与引力波和各种LISA仪器噪声有不同的耦合。在干涉组合LISA的功能空间将能够合成,我们已经确定了一个三重干涉组合,显示最佳组合的灵敏度。作为该方法的一个应用,我们计算了标称,等臂LISA配置的正弦源的灵敏度改善。在波的周期比光在LISA上的典型传播时间长的傅里叶频带部分,单个迈克耳孙干涉仪的灵敏度增益等于$\sqrt{2}$。在LISA迈克尔逊组合具有最佳灵敏度的中频带区域中,相对于迈克尔逊灵敏度的改善略优于$\sqrt{2}$,并且最佳灵敏度的频带被加宽。对于大于光传播时间的倒数的频率,灵敏度的提高是振荡的和$\sim \sqrt{3}$,但在LISA臂中单程光传播时间的倒数的整数倍的频率附近可以大于$\sqrt{3}$。

英文摘要:

The multiple Doppler readouts available on the Laser Interferometer Space Antenna (LISA) permit simultaneous formation of several interferometric observables. All these observables are independent of laser frequency fluctuations and have different couplings to gravitational waves and to the various LISA instrumental noises. Within the functional space of interferometric combinations LISA will be able to synthesize, we have identified a triplet of interferometric combinations that show optimally combined sensitivity. As an application of the method, we computed the sensitivity improvement for sinusoidal sources in the nominal, equal-arm LISA configuration. In the part of the Fourier band where the period of the wave is longer than the typical light travel-time across LISA, the sensitivity gain over a single Michelson interferometer is equal to $\sqrt{2}$. In the mid-band region, where the LISA Michelson combination has its best sensitivity, the improvement over the Michelson sensitivity is slightly better than $\sqrt{2}$, and the frequency band of best sensitivity is broadened. For frequencies greater than the reciprocal of the light travel-time, the sensitivity improvement is oscillatory and $\sim \sqrt{3}$, but can be greater than $\sqrt{3}$ near frequencies that are integer multiples of the inverse of the one-way light travel-time in the LISA arm.

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