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148 records were found.

Comment: 15 pages, including 4 figures. The coefficient of Rayleigh scattering cross section and some numbers corrected, figures rescaled, main conclusions not changed. ApJ in press
Comment: 20 pages, 7 figures, submitted to ApJ
Comment: 6 pages, 4 figures. White paper submitted to NASA's 2003 SEU Roadmap Team
Comment: 20 pages, 9 figures, to appear in ApJ
Comment: Paper also at: http://www.orfe.princeton.edu/~rvdb/tex/starshape/ms.pdf Updated to clarify misleading statements regarding total throughput for apodizations and their corresponding starshaped masks
We derive a fast way for measuring primordial non-Gaussianity in a nearly full-sky map of the cosmic microwave background. We find a cubic combination of sky maps combining bispectrum configurations to capture a quadratic term in primordial fluctuations. Our method takes only N^1.5 operations rather than N^2.5 of the bispectrum analysis (1000 times faster for l=512), retaining the same sensitivity. A key component is a map of underlying primordial fluctuations, which can be more sensitive to the primordial non-Gaussianity than a temperature map. We also derive a fast and accurate statistic for measuring non-Gaussian signals from foreground point sources. The statistic is 10^6 times faster than the full bispectrum analysis, and can be used to estimate contamination from the sources. Our algorithm has been successfully applied to the W...
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