Constraints on cosmology beyond ΛCDM with kinetic Sunyaev Zel'dovich velocity reconstruction

Kinetic Sunyaev Zel'dovich velocity reconstruction uses the statistically anisotropic cross-correlation between cosmic microwave background (CMB) temperature anisotropies and a galaxy survey to reconstruct the remotely observed CMB dipole. Using a reconstruction based on data from Planck and unWISE, we rule out non-linear Gpc-scale voids, provide the tightest constraint on the intrinsic dipole (<14 \ km/s at $68%$ confidence), rule out matter-radiation isocurvature as an explanation of discrepancies between the measured CMB and galaxy number count dipoles, and constrain the amplitude of local-type primordial non-Gaussianity (-220 fNL 136 at $68%$ confidence) and compensated isocurvature (-147 ACIP 281 at $68%$ confidence). This representative set of constraints on beyond-ΛCDM scenarios demonstrates the breadth of fundamental science possible with measurements of secondary CMB anisotropies such as the kinetic Sunyaev Zel'dovich effect.