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 provide the tightest constraint on the intrinsic dipole ($<14\mathrm{km}/\mathrm{s}$ 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 ($-293\lesssim f_{\mathrm{NL}}\lesssim 131$ at 68% confidence) and compensated isocurvature ($-158\lesssim A_{\mathrm{CIP}}\lesssim 323$ at 68% confidence). Given our current understanding of foreground contamination, we also rule out nonlinear gigaparsec-scale voids. This representative set of constraints on beyond-$\mathrm{\Lambda }\mathrm{CDM}$ scenarios demonstrates the breadth of fundamental science possible with measurements of secondary CMB anisotropies such as the kinetic Sunyaev Zel’dovich effect.

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• Cosmic microwave background
• Inflation
• Large scale structure of the Universe