A torsion-bar antenna (TOBA) is a novel scheme for a gravitational 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 tidal gravitational 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.
The predicted frequency band over which such a detector would be most sensitive would be centered on 1 Hz, similar to DECIGO.
This frequency range would complement current ground-based, laser interferometric detectors (whose sensitive band is between 10–100 Hz and several kHz, such as LIGO or Virgo), and proposed space-based, laser interferometric detectors (such as LISA whose sensitive band is centered on 10−4 Hz).