Built on

A. A. Starobinsky, Multicomponent de Sitter (Inflationary) Stages and the Generation of Perturbations
1985
Earlier work this paper cites.
D. S. Salopek and J. R. Bond, Nonlinear evolution of long wavelength metric fluctuations in inflationary models
1990
Earlier work this paper cites.
M. Sasaki and E. D. Stewart, A General analytic formula for the spectral index of the density perturbations produced during inflation
1996
Earlier work this paper cites.
M. Sasaki and T. Tanaka, Superhorizon scale dynamics of multiscalar inflation
1998
Earlier work this paper cites.
C. Gordon, D. Wands, B. A. Bassett, and R. Maartens, Adiabatic and entropy perturbations from inflation
2001
Earlier work this paper cites.
N. Bartolo, S. Matarrese, and A. Riotto, Adiabatic and isocurvature perturbations from inflation: Power spectra and consistency relations
2001
Earlier work this paper cites.
A. A. Starobinsky, S. Tsujikawa, and J. Yokoyama, Cosmological perturbations from multifield inflation in generalized Einstein theories
2001
Earlier work this paper cites.
S. Groot Nibbelink and B. J. W. van Tent, Scalar perturbations during multiple field slow-roll inflation
2002
Earlier work this paper cites.
F. Di Marco, F. Finelli, and R. Brandenberger, Adiabatic and isocurvature perturbations for multifield generalized Einstein models
2003
Earlier work this paper cites.
J. M. Maldacena, Non-Gaussian features of primordial fluctuations in single field inflationary models
2003
Earlier work this paper cites.
P. Creminelli and M. Zaldarriaga, Single field consistency relation for the 3-point function
2004
Earlier work this paper cites.
H.-C. Lee, M. Sasaki, E. D. Stewart, T. Tanaka, and S. Yokoyama, A New delta N formalism for multi-component inflation
2005
Earlier work this paper cites.

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2017

Universality of multi-field $\alpha$-attractors

Achúcarro, Ana, Kallosh, Renata, Linde, Andrei et al.

Understand

We study a particular version of the theory of cosmological $\alpha$-attractors with $\alpha=1/3$, in which both the dilaton (inflaton) field and the axion field are light during inflation.

The kinetic terms in this theory originate from maximal $\mathcal{N}=4$ superconformal symmetry and from maximal $\mathcal{N}=8$ supergravity.
We show that because of the underlying hyperbolic geometry of the moduli space in this theory, it exhibits double attractor behavior: their cosmological predictions are stable not only with respect to significant modifications of the dilaton potential, but also with respect to significant modifications of the axion potential: $n_s\simeq 1-{2\over N}$, $r\simeq {4\over N^2}$.
We also show that the universality of predictions extends to other values of $\alpha \lesssim {\cal O}(1)$ with general two-field potentials that may or may not have an embedding in supergravity.

Built on

A. A. Starobinsky, Multicomponent de Sitter (Inflationary) Stages and the Generation of Perturbations
1985
Earlier work this paper cites.
D. S. Salopek and J. R. Bond, Nonlinear evolution of long wavelength metric fluctuations in inflationary models
1990
Earlier work this paper cites.
M. Sasaki and E. D. Stewart, A General analytic formula for the spectral index of the density perturbations produced during inflation
1996
Earlier work this paper cites.
M. Sasaki and T. Tanaka, Superhorizon scale dynamics of multiscalar inflation
1998
Earlier work this paper cites.
C. Gordon, D. Wands, B. A. Bassett, and R. Maartens, Adiabatic and entropy perturbations from inflation
2001
Earlier work this paper cites.
N. Bartolo, S. Matarrese, and A. Riotto, Adiabatic and isocurvature perturbations from inflation: Power spectra and consistency relations
2001
Earlier work this paper cites.
A. A. Starobinsky, S. Tsujikawa, and J. Yokoyama, Cosmological perturbations from multifield inflation in generalized Einstein theories
2001
Earlier work this paper cites.
S. Groot Nibbelink and B. J. W. van Tent, Scalar perturbations during multiple field slow-roll inflation
2002
Earlier work this paper cites.
F. Di Marco, F. Finelli, and R. Brandenberger, Adiabatic and isocurvature perturbations for multifield generalized Einstein models
2003
Earlier work this paper cites.
J. M. Maldacena, Non-Gaussian features of primordial fluctuations in single field inflationary models
2003
Earlier work this paper cites.
P. Creminelli and M. Zaldarriaga, Single field consistency relation for the 3-point function
2004
Earlier work this paper cites.
H.-C. Lee, M. Sasaki, E. D. Stewart, T. Tanaka, and S. Yokoyama, A New delta N formalism for multi-component inflation
2005
Earlier work this paper cites.