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Probing the Largest Cosmological Scales with the CMB-Velocity Correlation | | Pablo Fosalba
; Olivier Dore
; | | Date: |
28 Jan 2007 | | 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. | | Source: | arXiv, astro-ph/0701782 | | Services: | Forum | Review | PDF | Favorites | |
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