Non-gaussianities in DBI inflation with angular motion

Taichi Kidani, Kazuya Koyama

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Abstract


•INTRODUCTION
•BACKGROUND DYNAMICS
•LINEAR PERTURBATION
•NON-GAUSSIANITY
•SUMMARY AND DISCUSSIONS
•ACKNOWLEDGEMENTS
References

Abstract  
We study DBI spinflation models with angular potentials that are derived in string theory. We analyze the background dynamics with different parameter sets and study the impact of changing each parameter on inflationary dynamics. It is known that the conversion of the entropy perturbation into the curvature perturbation gives multifield Dirac-Born-Infeld (DBI) inflation models a possibility of satisfying the observational constraints by relaxing the stringent microphysical constraint that disfavors single-field DBI inflation models. We show that our model is excluded by the Planck satellite observations even with the conversion mechanism regardless of the parameter set.
Original languageEnglish
Pages (from-to)023515 1-17
JournalPhysical Review D
Volume90
Issue number2
DOIs
Publication statusPublished - 10 Jul 2014

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