Universality classes of inflation
By D. Roest. 2013
141 citations recorded by the source corpus.
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. This predicts r either to be unobservably small, r < 0.01, or close to the present observational limit, r ≈ 0.07.
Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/873fc506aed4fd437642df878332ae9c6705cc09
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Astronomy and Astrophysics
In Nuclear and High Energy Physics
Citations in the corpus
- Dynamically induced Planck scale and inflation (2015, background): “When both fields are relevant, our prediction for (ns, r) lies in the ‘forbidden region’ according to the claim in [103–105] that assumes single field inflation.”
- Primordial gravitational waves for universality classes of pseudoscalar inflation (2016, background): “accounting for an increase over the course of inflation, required to end inflation [12, 13, 22].”
- Large field inflation and double α-attractors (2014, unknown): “while subleading corrections will be model-dependent [18].”
- Multi-field conformal cosmological attractors (2013, background): “Recently these conclusions have been confirmed by explicit calculations of ns and r in the next-to-leading order in 1/N [26].”
- Single field double inflation and primordial black holes (2017, result): “As a result, the dynamics of inflation during the first stage will necessarily deviate from the prediction of Higgs and Starobinsky inflation (p ≈ 2 [70, 71]), as well as hilltop inflation (p > 2 [59, 68]).”
- Superconformal inflationary α-attractors (2013, background): “between the different 1/N universality classes identified in [19,20].”