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We show that an isotropic component of circular polarization of a stochastic gravitational wave background can be explored by contriving configuration of multiple laser interferometers for correlation analysis. For the proposed BBO mission, the circular polarization degree can be measured down to 0. 08 (₆ₖ/10^-15) ^-1 (SNR/5) with slightly (10%) sacrificing the detection limit for the total intensity ₆ₖ. This might allow us to detect a signature of parity violation in the very early universe.
Naoki Seto (Tue,) studied this question.