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Curvature and isocurvature perturbations in two-field inflation

Z. Lalak David Langlois 1 S. Pokorski K. Turzynski
APC (UMR_7164) - AstroParticule et Cosmologie, Institut für theoretische Physik
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.
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Contributor : Simone Lantz <>
Submitted on : Thursday, May 10, 2007 - 11:21:49 AM
Last modification on : Saturday, September 19, 2020 - 4:50:47 AM

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Z. Lalak, David Langlois, S. Pokorski, K. Turzynski. Curvature and isocurvature perturbations in two-field inflation. Journal of Cosmology and Astroparticle Physics, Institute of Physics (IOP), 2007, 07, pp.014. ⟨10.1088/1475-7516/2007/07/014⟩. ⟨in2p3-00145419⟩



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