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THE COSMIC MICROWAVE BACKGROUND BISPECTRUM AS A TEST OF THE PHYSICS OF INFLATION AND PROBE OF THE ASTROPHYSICS OF THE LOW-REDSHIFT UNIVERSE
Why is non-Gaussianity interesting? One of generic predictions from inflationary scenarios is that primordial fluctuations are exactly Gaussian in linear order; however, the non-linearity in the inflation will produce weak non-Gaussianity. Thus, measuring the non-Gaussianity in the cosmic microwave background radiation anisotropy is a probe of the non-linear physics in …