Curvature and isocurvature perturbations from two-field inflation in a slow-roll expansion

@article{Byrnes2006CurvatureAI,
  title={Curvature and isocurvature perturbations from two-field inflation in a slow-roll expansion},
  author={C. Byrnes and D. Wands},
  journal={Physical Review D},
  year={2006},
  volume={74},
  pages={043529}
}
We calculate the power spectra of primordial curvature and isocurvature perturbations from a general two-field inflation model at next-to-leading order correction in a slow-roll expansion. In particular we calculate the spectral indices to second order in slow-roll parameters. We show that the cross correlation of the curvature and isocurvature perturbations at the time of Hubble exit during inflation is nonzero at first order in slow-roll parameters. We apply our results to different classes… Expand
On cross-correlations between curvature and isocurvature perturbations during inflation
Adiabatic and isocurvature perturbation projections in multi-field inflation
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