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Density Perturbations from Two-field Inflation
David Wands, Juan Garcia-Bellido
We discuss metric perturbations produced during a period of inflation in the early universe where two scalar fields evolve. The final scalar perturbation spectrum can be calculated…
Normalization of modes in an open universe
Juan Garcia-Bellido, Andrew R Liddle, David H Lyth +1
We discuss the appropriate normalization of modes required to generate a homogeneous random field in an open Friedmann-Robertson-Walker universe. We consider scalar random fields a…
The spectrum of curvature perturbations from hybrid inflation
Juan Garcia-Bellido, David Wands
We study the amplitude and spectral tilt of density perturbations in the simplest hybrid inflation models. We give an exact expression for the amplitude of quantum fluctuations on…
Density Perturbations and Black Hole Formation in Hybrid Inflation
Juan Garcia-Bellido, Andrei Linde, David Wands
We investigate the recently proposed hybrid inflation models with two stages of inflation. We show that quantum fluctuations at the time corresponding to the phase transition betwe…