Curvature and isocurvature perturbations in two-field inflation
arXiv:0704.0212 · doi:10.1088/1475-7516/2007/07/014
Abstract
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.
29 pages, 12 figures; v2: updated references, discussion extended, matches the published version
References in corpus (6)
- Primordial trispectrum from inflation
- Curvature and isocurvature perturbations from two-field inflation in a slow-roll expansion
- Roulette Inflation with Kähler Moduli and their Axions
- Holographic Grand Unification
- The Price of WMAP Inflation in Supergravity
- Inflation, quantum fluctuations and cosmological perturbations
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- Primordial Non-Gaussianities from the Trispectra in Multiple Field Inflationary Models
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- Topology from Cosmology
- On the four-dimensional effective theories in brane-worlds
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