Probing the Largest Cosmological Scales with the CMB-Velocity Correlation

Abstract

Cross-correlation between the CMB and large-scale structure is a powerful probe of dark-energy and gravity on the largest physical scales. We introduce a novel estimator, the CMB-velocity correlation, that has most of his power on large scales and that, at low redshift, delivers up to factor of two higher signal-to-noise ratio than the recently detected CMB-dark matter density correlation expected from the Integrated Sachs-Wolfe effect. We propose to use a combination of peculiar velocities measured from supernovae type Ia and kinetic Sunyaev-Zeldovich cluster surveys to reveal this signal and forecast dark-energy constraints that can be achieved with future surveys. We stress that low redshift peculiar velocity measurements should be exploited with complementary deeper large-scale structure surveys for precision cosmology.

arXiv commentMatches version accepted for publication in PRD (November 2007 issue)

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Cited by in corpus (10)

• Consistently Large Cosmic Flows on Scales of 100 Mpc/h: a Challenge for the Standard LCDM Cosmology
• Observational Tests of Modified Gravity
• Generation of Vorticity and Velocity Dispersion by Orbit Crossing
• Constraints on gravity and dark energy from the pairwise kinematic Sunyaev-Zeldovich effect
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• kSZ Pairwise Velocity Reconstruction with Machine Learning
• Testing modified (Horndeski) gravity by combining intrinsic galaxyalignments with cosmic shear