Reconstruction of Gravitational Lensing Using WMAP 7-Year Data

Abstract

Gravitational lensing by large scale structure introduces non-Gaussianity into the Cosmic Microwave Background and imprints a new observable, which can be used as a cosmological probe. We apply a four-point estimator to the Wilkinson Microwave Anisotropy Probe (WMAP) 7-year coadded temperature maps alone to reconstruct the gravitational lensing signal. The Gaussian bias is simulated and subtracted, and the higher order bias is investigated. We measure a gravitational lensing signal with a statistical amplitude of $\mathcal{C}$ = $1.27\pm 0.98$ using all the correlations of the W- and V-band Differencing Assemblies (DAs). We therefore conclude that WMAP 7-year data alone, can not detect lensing.

10 pages, 10 figures

References in corpus (6)

• Detection of Gravitational Lensing in the Cosmic Microwave Background
• Correlation of CMB with large-scale structure: II. Weak lensing
• CMB temperature lensing power reconstruction
• Reconstructing Patchy Reionization from the Cosmic Microwave Background
• B-mode CMB Polarization from Patchy Screening during Reionization
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Cited by in corpus (10)

• Planck 2013 results. XVII. Gravitational lensing by large-scale structure
• A measurement of gravitational lensing of the microwave background using South Pole Telescope data
• Measurement of the Cosmic Microwave Background Polarization Lensing Power Spectrum with the POLARBEAR experiment
• Bias-Hardened CMB Lensing
• CMB lensing tomography with the DES Science Verification galaxies
• Evidence for Gravitational Lensing of the Cosmic Microwave Background Polarization from Cross-correlation with the Cosmic Infrared Background
• Isotropy analyses of the Planck convergence map
• Measuring gravitational lensing of the cosmic microwave background using cross correlation with large scale structure
• Limits on Semiclassical Fluctuations in the Primordial Universe
• CMB lensing reconstruction from the WMAP 7-year data