Probing the Largest Cosmological Scales with the CMB-Velocity Correlation

Details Probing the Largest Cosmological Scales with the CMB-Velocity Correlation Probing the Largest Cosmological Scales with the CMB-Velocity Correlation

2007-01-28

arxiv.org/abs/astro-ph/0701782v2

Phys.Rev.D76:103523,2007

Astronomy and Astrophysics

Astrophysics

Matches version accepted for publication in PRD (November 2007 issue)

Scientific paper

10.1103/PhysRevD.76.103523

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.

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