Author:
Anguelova Lilia,Lazaroiu Calin Iuliu
Abstract
Abstract
We derive consistency conditions for sustained slow roll and rapid turn inflation in
two-field cosmological models with oriented scalar field space, which imply that inflationary
models with field-space trajectories of this type are non-generic. In particular, we show that
third order adiabatic slow roll, together with large and slowly varying turn rate, requires the
scalar potential of the model to satisfy a certain nonlinear second order PDE, whose coefficients
depend on the scalar field metric. We also derive consistency conditions for slow roll
inflationary solutions in the so called “rapid turn attractor” approximation, as well as study
the consistency conditions for circular rapid turn trajectories with slow roll in two-field models
with rotationally invariant field space metric. Finally, we argue that the rapid turn regime
tends to have a natural exit after a limited number of e-folds.
Subject
Astronomy and Astrophysics
Cited by
2 articles.
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