Torsion bar antenna in the proper reference frame with rotation

The resultant response of the rotating torsion bar antenna for gravitational waves discussed in [M. Ando et al., Phys. Rev. Lett. {\bf 105} (2010), 161101.] is re-investigate from a general-relativistic point of view. To do this, the equation of motion of a free falling particle in the proper reference frame of a rotating observer is used. As a result, the resultant response derived in the above paper is also valid even when $ω_{g}\simΩ$, where $ω_{g}$ and $Ω$ are the angular frequencies of gravitational waves and the rotation of the antenna, respectively.

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