The covariance of multi-field perturbations, pseudo-susy and f_NL [PDF]
Paul M. SaffinWe reconsider cosmological perturbation theory for multi-component scalars, enforcing covariance in field-space, and ensuring that phyical observations are independent of field re-definitions. We use the formalism to clarify some issues in the literature, and use pseudo-supersymmetry to derive exact expressions for terms of interest.View original: http://arxiv.org/abs/1203.0397
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