Dmitri E. Kharzeev, Azadeh Maleknejad, Saba Shalamberidze

The cosmological gravitational wave background provides a powerful window on parity-violating physics at energies far beyond the reach of terrestrial experiments. However, any co-located planar detector network is insensitive to isotropic circular polarization, independent of its relative orien- tation. In this letter, we show that this no-go result can be evaded by a new class of co-located 3D interferometer designs, which we call Pyramid, whose non-coplanar configuration geometrically isolates chirality. This new design is a natural extension of the third generation of gravitational wave detectors. The coplanar correlation channel is blind to circular polarization, whereas the co-located non-coplanar channel is insensitive to the unpolarized background and acquires a response only in the presence of nonzero net helicity. Pyramid interferometers therefore furnish a unique probe of cosmological gravitational-wave chirality, opening a realistic terrestrial pathway to test parity violation and fundamental symmetry breaking in the early Universe.