• Corpus ID: 118515152

Inflation on a Slippery Slope

@article{Freivogel2016InflationOA,
  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},
  year={2016}
}
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… 
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References

SHOWING 1-10 OF 36 REFERENCES
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,…
The scale of inflation in the landscape
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
TLDR
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…
...
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2
3
4
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