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The cosmic microwave background (CMB) is sensitive to the recent phase ofaccelerated cosmic expansion through the late-time integrated Sachs-Wolfe (ISW)effect, which manifests as secondary temperature fluctuations on large angularscales. However, the large cosmic variance from primary CMB fluctuations limitsthe usefulness of this effect in constraining dark energy or modified gravity.In this paper, we propose a novel method to separate the ISW signal from theprimary signal using gravitational lensing, based on the fact that the ISWsignal is, to a good approximation, not gravitationally lensed. We forecast howwell we can isolate the ISW signal for different experimental configurations,and discuss various applications, including modified gravity, large-scale CMBanomalies, and measurements of local-type primordial non-Gaussianity. Althoughnot within reach of current experiments, the proposed method is a unique way toremove the cosmic variance of the primary signal, allowing for better CMB-basedconstraints on late-time phenomena than previously thought possible.

Cosmic variance mitigation in measurements of the integrated Sachs-Wolfe effect