Superconformal inflationary α-attractors

By R. Kallosh, Andrei Linde, D. Roest. 2013

709 citations recorded by the source corpus.

A bstractRecently a broad class of superconformal inflationary models was found leading to a universal observational prediction $ {n_s}=1-\frac{2}{N} $ and $ r=\frac{12 }{{{N^2}}} $ [1, 2]. Here we generalize this class of models by introducing a parameter α inversely proportional to the curvature of the inflaton Kähler manifold. In the small curvature (large α) limit, the observational predictions of this class of models coincide with the predictions of generic chaotic inflation models. However, for sufficiently large curvature (small α), the predictions converge to the universal attractor regime with $ {n_s}=1-\frac{2}{N} $ and $ r=\alpha \frac{12 }{{{N^2}}} $, which corresponds to the part of the ns − r plane favored by the Planck data.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/248985ea931dd90f85aeba7adb8a569c6791b5c2

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

1. D. Baumann
2. Xingang Chen
3. E. Pajer
4. Andrei Linde
5. S. Vagnozzi
6. M. Zaldarriaga
7. R. Kallosh
8. L. Senatore

In Nuclear and High Energy Physics

1. Xingang Chen
2. Andrei Linde
3. D. Baumann
4. R. Kallosh
5. S. Vagnozzi
6. E. Pajer
7. D. Roest
8. Sergio Ferrara

Citations in the corpus

• Exploring cosmic origins with CORE: Inflation (2016, background): “The second has p = q, comparable to Starobinsky inflation and α-attractors [30, 85] and leads to a per thousand level of r.”
• Revisiting non-Gaussianity from non-attractor inflation models (2017, background): “1 Numerical study on a plateau-like potential In a realistic case, non-attractor inflation can be seen as imposing the ultra-slow-roll initial condition on a plateau-like inflaton potential (such as Starobinsky inflation [3] and α-attractors [32, 33]).”
• The Landscape, the Swampland and the Era of Precision Cosmology (2018, background): “This framework helps to develop broad classes of α-attractor models in [136], which fit the data very well; see Fig.”
• Primordial black holes from a tiny bump/dip in the inflaton potential (2019, methodology): “Applying this simple prescription to the string theory 1 based KKLT model [52, 53] and to α-attractor potentials [54, 55] we find a sharp local enhancement of primordial perturbations at φ0 which can result in a significant abundance of PBHs at the present epoch.”
• Inflationary Cosmology after Planck 2013 (2014, background): “Another class of models found in [135] generalizes superconformal attractors discussed in Section (13.”
• The Swampland: Introduction and Review (2019, background): “Starobinsky inflation is part of a more general set of inflation models termed α-attractors [179–181].”
• Occurrence of exact R2 inflation in non-local UV-complete gravity (2016, methodology): “For a narrow subclass of inflaton potentials considered in [75], namely for the potential V (φ) ∝ tanh(2)(αφ), it is possible to keep the same scale dependence ns(k), too.”
• Planck2018 results (2018, background): “– Planck and BK14 data set tight constraints on α attractors (Kallosh et al. 2013; Ferrara et al. 2013).”
• Large field inflation and double α-attractors (2014, methodology): “In [11] we studied the limit of large α for the choice f(x) = x.”
• Cosmology with nilpotent superfields (2014, background): “In all our supergravity models in [1–9], there is one light scalar, the inflaton.”
• The Ups and Downs of Early Dark Energy solutions to the Hubble tension: A review of models, hints and constraints circa 2023 (2023, neutral): “[131] Renata Kallosh, Andrei Linde, and Diederik Roest, “Superconformal Inflationary α-Attractors,” JHEP 11, 198 (2013), arXiv:1311.”
• Beginning inflation in an inhomogeneous universe (2015, neutral): “describing a family of cosmological attractors [26, 27].”