An Observational Test of Two-field Inflation

Details An Observational Test of Two-field Inflation An Observational Test of Two-field Inflation

2002-05-16

arxiv.org/abs/astro-ph/0205253v2

Phys.Rev. D66 (2002) 043520

Astronomy and Astrophysics

Astrophysics

6 pages, latex with revtex, no figures; v2, minor changes, to appear in Physical Review D

Scientific paper

10.1103/PhysRevD.66.043520

We study adiabatic and isocurvature perturbation spectra produced by a period of cosmological inflation driven by two scalar fields. We show that there exists a model-independent consistency condition for all two-field models of slow-roll inflation, despite allowing for model-dependent linear processing of curvature and isocurvature perturbations during and after inflation on super-horizon scales. The scale-dependence of all spectra are determined solely in terms of slow-roll parameters during inflation and the dimensionless cross-correlation between curvature and isocurvature perturbations. We present additional model-dependent consistency relations that may be derived in specific two-field models, such as the curvaton scenario.

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