Curvature and isocurvature perturbations in two-field inflation
By Z. Lalak, D. Langlois, S. Pokorski, K. Turzyński. 2007
207 citations recorded by the source corpus.
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.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/565d2840313515412ce7beacd0c2b6e6e441b175
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In Astronomy and Astrophysics
In Nuclear and High Energy Physics
Citations in the corpus
- Generating PBHs and small-scale GWs in two-field models of inflation (2020, methodology): “We would refer the reader to our earlier paper [43] as well as the original efforts for further details in this regard [32, 51–54].”
- Features of heavy physics in the CMB power spectrum (2010, methodology): “Our methods are completely general and naturally incorporate those implemented in previous works [49, 61], where stochastic Gaussian variables are used.”
- Non-linear isocurvature perturbations and non-Gaussianities (2008, background): “At leading order in a slow-roll expansion the adiabatic and entropy field perturbations are independent Gaussian random fields, with [47, 48]”