• Corpus ID: 118515152

Inflation on a Slippery Slope

  title={Inflation on a Slippery Slope},
  author={Ben Freivogel and Roberto Gobbetti and Enrico Pajer and I-Sheng Yang},
  journal={arXiv: High Energy Physics - Theory},
We study inflation in a random multifield potential, using techniques developed by Marsh et al. The potential is a function of a large number of fields, and we choose parameters so that inflation only occurs in regions where the potential is accidentally flat. Using an improved estimate for the dynamics of eigenvalue repulsion, we are able to describe the steepening of the potential as inflation progresses. We provide suggestive arguments, but not a proof, that the resulting scalar power… 

Figures from this paper

Inflation with a graceful exit in a random landscape
A bstractWe develop a stochastic description of small-field inflationary histories with a graceful exit in a random potential whose Hessian is a Gaussian random matrix as a model of the unstructured
Inflation in multi-field modified DBM potentials
  • S. Paban, R. Rosati
  • Computer Science
    Journal of Cosmology and Astroparticle Physics
  • 2018
It is concluded that Planck compatibility is a common prediction of such models, however significant isocurvature power at the end of inflation is possible.
Inflation in random landscapes with two energy scales
A bstractWe investigate inflation in a multi-dimensional landscape with a hierarchy of energy scales, motivated by the string theory, where the energy scale of Kahler moduli is usually assumed to be
Initial conditions for slow-roll inflation in a random Gaussian landscape
In the landscape perspective, our Universe begins with a quantum tunneling from an eternally-inflating parent vacuum, followed by a period of slow-roll inflation. We investigate the tunneling process
Inflation in multi-field random Gaussian landscapes
We investigate slow-roll inflation in a multi-field random Gaussian landscape. The landscape is assumed to be small-field, with a correlation length much smaller than the Planck scale. Inflation then
Multifield inflation in random potentials and the rapid-turn limit
Multifield inflation in random potentials and the rapid-turn limit Theodor Björkmo Cosmological inflation is a simple, and observationally well-supported, mechanism for generating a flat, spatially
Seven lessons from manyfield inflation in random potentials
We study inflation in models with many interacting fields subject to randomly generated scalar potentials. We use methods from non-equilibrium random matrix theory to construct the potentials and an
Inflation in random Gaussian landscapes
We develop analytic and numerical techniques for studying the statistics of slow-roll inflation in random Gaussian landscapes. As an illustration of these techniques, we analyze small-field inflation
Learning to inflate. A gradient ascent approach to random inflation
  • Tom Rudelius
  • Computer Science, Economics
    Journal of Cosmology and Astroparticle Physics
  • 2019
A novel method for randomly generating inflationary potentials is introduced, which treats the Taylor coefficients of the potential as weights in a single-layer neural network and uses gradient ascent to maximize the number of e-folds of inflation.
Cosmological Inflation in N-Dimensional Gaussian Random Fields with Algorithmic Data Compression
The Gaussian random potential is a highly versatile inflationary model with a rich volume of parameter space capable of reproducing modern observations and is found to be maximally random.


A statistical approach to multifield inflation: many-field perturbations beyond slow roll
We study multifield contributions to the scalar power spectrum in an ensemble of six-field inflationary models obtained in string theory. We identify examples in which inflation occurs by chance,
Charting an Inflationary Landscape with Random Matrix Theory
We construct a class of random potentials for N >> 1 scalar fields using non-equilibrium random matrix theory, and then characterize multifield inflation in this setting. By stipulating that the
Probability of Slowroll Inflation in the Multiverse
It is shown that the FVEI picture is still self-consistent and may have a strong preference between different slowroll models and the chance to slowroll is exponentially suppressed, where the exponent comes from the number of fields.
Strong multifield slowroll condition and spiral inflation
We point out the existing confusions about the slowroll parameters and conditions for multifield inflation. If one requires the fields to roll down the gradient flow, we find that only articles
On Gaussian random supergravity
A bstractWe study the distribution of metastable vacua and the likelihood of slow roll inflation in high dimensional random landscapes. We consider two examples of landscapes: a Gaussian random
Simple Emergent Power Spectra from Complex Inflationary Physics.
We construct ensembles of random scalar potentials for N_{f}-interacting scalar fields using nonequilibrium random matrix theory, and use these to study the generation of observables during
Decoupling survives inflation: a critical look at effective field theory violations during inflation
We investigate the validity of effective field theory methods and the decoupling of heavy fields during inflation. Considering models of inflation in which the inflaton is coupled to a heavy
Exploring Spiral Inflation in String Theory
We investigate the possibility that spiral inflation can be realized using the near-conifold flux potentials for the complex structure moduli in type IIB string theory compactified on a Calabi-Yau
Random matrices and the spectrum of N-flation
N-flation is a promising embedding of inflation in string theory in which many string axions combine to drive inflation. We characterize the dynamics of a general N-flation model with nondegenerate