منابع مشابه
Inflationary attractors and perturbation spectra in generally coupled gravity.
A generic outcome of theories with scalar-tensor coupling is the existence of inflationary attractors, either power-law or de Sitter. The fluctuations arising during this phase are Gaussian and their spectrum depends on the wavenumber k according to the power-law k 1/(1−p) , where p is the inflationary power-law exponent. We investigate to which extent these properties depend on the coupling fu...
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In a series of recent papers Kallosh, Linde, and collaborators provide a unified description of single-field inflation with several types of potentials ranging from power law to supergravity, in terms of just one parameter α. These so-called α attractors predict a spectral index ns and a tensor-to-scalar ratio r, which are fully compatible with the latest Planck data. The only common feature of...
متن کاملPower Spectrum of Inflationary Attractors
Inflationary attractors predict the spectral index and tensor-to-scalar ratio to take specific values that are consistent with Planck. An example is the universal attractor for models with a generalised non-minimal coupling, leading to Starobinsky inflation. In this paper we demonstrate that it also predicts a specific relation between the amplitude of the power spectrum and the number of e-fol...
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Inflationary attractors predict the spectral index and tensor-to-scalar ratio to take specific values that are consistent with Planck. An example is the universal attractor for models with a generalised non-minimal coupling, leading to Starobinsky inflation. In this letter we demonstrate that it also predicts a specific relation between the amplitude of the power spectrum and the number of e-fo...
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We study the attractor mechanism in low energy effective D = 4, N = 2 Yang-Mills theory weakly coupled to gravity, obtained from the effective action of type IIB string theory compactified on a Calabi-Yau manifold. Using special Kähler geometry, the general form of the leading gravitational correction is derived, and from this the attractor equations in the weak gravity limit. The effective New...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2020
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2020.135576