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2008

Isocurvature, non-gaussianity and the curvaton model

Beltrán, Maria

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Recent analyses of the statistical distribution of the temperature anisotropies in the CMB do not rule out the possibility that there is a large non-gaussian contribution to the primordial power spectrum.

This fact motivates the re-analysis of the curvaton scenario, paying special attention to the compatibility of large non-gaussianity of the local type with the current detection limits on the isocurvature amplitude in the CMB.
We find that if the curvaton mechanism generates a primordial power spectrum with an important non-gaussian component, any residual isocurvature imprint originated by the curvaton, would have an amplitude too big to be compatible with the current bounds.
This implies that the isocurvature mode should be equal to zero in this scenario and we explore the consequences of this inference.

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