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- W3100344082 abstract "We study the effect of primordial isocurvature perturbations on non-Gaussian properties of cosmic microwave background (CMB) temperature anisotropies. We consider generic forms of the non-linearity of isocurvature perturbations which can be applied to a wide range of theoretical models. We derive analytical expressions for the bispectrum and the Minkowski Functionals for CMB temperature fluctuations to describe the non-Gaussianity from isocurvature perturbations. We find that the isocurvature non-Gaussianity in the quadratic isocurvature model, where the isocurvature perturbation S is written as a quadratic function of the Gaussian variable σ, S=σ2−〈σ2〉, can give the same signal-to-noise ratio as fNL= 30 even if we impose the current observational limit on the fraction of isocurvature perturbations contained in the primordial power spectrum α. We give constraints on isocurvature non-Gaussianity from Minkowski Functionals using the Wilkinson Microwave Anisotropy Probe (WMAP) 5-year data. We do not find a significant signal of isocurvature non-Gaussianity. For the quadratic isocurvature model, we obtain a stringent upper limit on the isocurvature fraction α < 0.070 (95 per cent CL) for a scale-invariant spectrum which is comparable to the limit obtained from the power spectrum." @default.
- W3100344082 created "2020-11-23" @default.
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- W3100344082 date "2009-10-01" @default.
- W3100344082 modified "2023-09-25" @default.
- W3100344082 title "Limits on isocurvature perturbations from non-Gaussianity inWMAPtemperature anisotropy" @default.
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- W3100344082 doi "https://doi.org/10.1111/j.1365-2966.2009.15269.x" @default.
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