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Due to cosmic variance we cannot learn any more about large-scaleinhomogeneities from the primary cosmic microwave background (CMB) alone. Moreinformation on large scales is essential for resolving large angular scaleanomalies in the CMB. Here we consider cross correlating the large-scalekinetic Sunyaev Zel'dovich (kSZ) effect and probes of large-scale structure, atechnique known as kSZ tomography. The statistically anisotropic component ofthe cross correlation encodes the CMB dipole as seen by free electronsthroughout the observable Universe, providing information about long wavelengthinhomogeneities. We compute the large angular scale power asymmetry,constructing the appropriate transfer functions, and estimate the cosmicvariance limited signal to noise for a variety of redshift bin configurations.The signal to noise is significant over a large range of power multipoles andnumbers of bins. We present a simple mode counting argument indicating that kSZtomography can be used to estimate more modes than the primary CMB oncomparable scales. A basic forecast indicates that a first detection could bemade with next-generation CMB experiments and galaxy surveys. This papermotivates a more systematic investigation of how close to the cosmic variancelimit it will be possible to get with future observations.

journal of cosmology and astroparticle physics

Analyzing the cosmic variance limit of remote dipole measurements of the  cosmic microwave background using the large-scale kinetic Sunyaev Zel'dovich  effect