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Atorsion-bar antenna (TOBA) is a novel scheme for agravitational wave detector, proposed by M. Ando, et al. in 2010. The proposed design is composed of two, long, thin bars, suspended as torsion pendula in a cross-like fashion. Their differential angle (sensitive to tidalgravitational wave forces) would be compared using a set of optical cavities with one end mirror of each cavity fixed to the ends of each bar. Such a detector could be fashioned either for ground-based or space-based use.
The predicted frequency band over which such a detector would be most sensitive would be centered on 1 Hz, similar toDECIGO. This frequency range would complement current ground-based, laser interferometric detectors (whose sensitive band is between 10–100 Hz and several kHz, such asLIGO orVirgo), and proposed space-based, laser interferometric detectors (such asLISA whose sensitive band is centered on 10−4 Hz).[1]
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