Curvature and isocurvature perturbations in two-field inflation
Apr, 2007
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Abstract: (arXiv)
We study cosmological perturbations in two-field inflation, allowing for non-standard kinetic terms. We calculate analytically the spectra of curvature and isocurvature modes at Hubble crossing, up to first order in the slow-roll parameters. We also compute numerically the evolution of the curvature and isocurvature modes from well within the Hubble radius until the end of inflation. We show explicitly for a few examples, including the recently proposed model of `roulette' inflation, how isocurvature perturbations affect significantly the curvature perturbation between Hubble crossing and the end of inflation.Note:
- 29 pages, 12 figures/ v2: updated references, discussion extended, matches the published version
- inflation
- relativity theory
- field theory: scalar
- field equations: solution
- fluctuation
- curvature: perturbation
- numerical calculations
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