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arXiv · 2207.09214

Conceptual design and science cases of a juggled interferometer for gravitational wave detection

Bin Wu·Tomohiro Ishikawa·Shoki Iwaguchi·Ryuma Shimizu·Izumi Watanabe·Yuki Kawasaki·Yuta Michimura·Shuichiro Yokoyama·Seiji Kawamura
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Abstract

The Juggled interferometer (JIFO) is an earth-based gravitational wave detector using repeatedly free-falling test masses. With no worries of seismic noise and suspension thermal noise, the JIFO can have much better sensitivity at lower frequencies than the current earth-based gravitational wave detectors. The data readout method of a JIFO could be challenging if one adopts the fringe-locking method. We present a phase reconstruction method in this paper by building up a complex function which has a fringe-independent signal-to-noise ratio. Considering the displacement noise budget of the Einstein Telescope (ET), we show that the juggled test masses significantly improve the sensitivity at 0.1-2.5$\,$Hz even with discontinuous data. The science cases brought with the improved sensitivity would include detecting quasi-normal modes of black holes with $10^4-10^5\,M_{\odot}$, testing Brans-Dicke theory with black-hole and neutron-star inspirals, and detecting primordial-black-hole-related gravitational waves.

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Bin Wu, Tomohiro Ishikawa, Shoki Iwaguchi, Ryuma Shimizu, Izumi Watanabe, Yuki Kawasaki, Yuta Michimura, Shuichiro Yokoyama, Seiji Kawamura. 2022-07-19. Conceptual design and science cases of a juggled interferometer for gravitational wave detection. https://doi.org/10.1103/physrevd.106.042007

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