Inflation: flow, fixed points and observables to arbitrary order in slow roll

Details Inflation: flow, fixed points and observables to arbitrary order in slow roll Inflation: flow, fixed points and observables to arbitrary order in slow roll

2002-06-03

arxiv.org/abs/astro-ph/0206032v4

Phys.Rev. D66 (2002) 083508

Astronomy and Astrophysics

Astrophysics

16 pages, 7 figures. LaTeX. V4: Fixed important error in numerical constant in the second-order slow roll expressions for the

Scientific paper

10.1103/PhysRevD.66.083508

I generalize the inflationary flow equations of Hoffman and Turner to arbitrary order in slow roll. This makes it possible to study the predictions of slow roll inflation in the full observable parameter space of tensor/scalar ratio $r$, spectral index $n$, and running $d n / d \ln k$. It also becomes possible to identify exact fixed points in the parameter flow. I numerically evaluate the flow equations to fifth order in slow roll for a set of randomly chosen initial conditions and find that the models cluster strongly in the observable parameter space, indicating a ``generic'' set of predictions for slow roll inflation. I comment briefly on the the interesting proposed correspondence between flow in inflationary parameter space and renormalization group flow in a boundary conformal field theory.

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