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2013

Universality classes of inflation

Roest, Diederik

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We investigate all single-field, slow-roll inflationary models whose slow-roll parameters scale as 1/N in the limit of a large number of e-folds N.

We proof that all such models belong to two universality classes, characterised by a single parameter.
One class contains small field models like hilltop inflation, while the other class consists of large field models like chaotic inflation.
We give the leading expressions for the spectral index and tensor-to-scalar ratio r, which are universal for each class, plus subleading corrections for a number of models.

Universality classes of inflation · Around

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A. D. Linde, A New Inflationary Universe Scenario: A Possible Solution of the Horizon, Flatness, Homogeneity, Isotropy and Primordial Monopole Problems
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A. D. Linde, Eternally Existing Selfreproducing Chaotic Inflationary Universe
1986
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K. Freese, J. A. Frieman and A. V. Olinto, Natural inflation with pseudo - Nambu-Goldstone bosons
Original
1990
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D. H. Lyth, What would we learn by detecting a gravitational wave signal in the cosmic microwave background anisotropy?
1997
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L. Boubekeur and D. Lyth, Hilltop inflation
2005
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