Non-gaussianities in DBI inflation with angular motion

Taichi Kidani; Kazuya Koyama

doi:10.1103/PhysRevD.90.023515

Non-gaussianities in DBI inflation with angular motion

Taichi Kidani, Kazuya Koyama

Institute of Cosmology & Gravitation

Research output: Contribution to journal › Article › peer-review

93 Downloads (Pure)

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 language	English
Pages (from-to)	023515 1-17
Journal	Physical Review D
Volume	90
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevD.90.023515
Publication status	Published - 10 Jul 2014

Access to Document

10.1103/PhysRevD.90.023515

1403.6687 - Non-Gaussianities in DBI inflation with angular motionAccepted author manuscript (Post-print), 2.02 MBLicence: CC BY

Cite this

@article{3be2fb3d960141ec88077002264c7505,

title = "Non-gaussianities in DBI inflation with angular motion",

abstract = "•INTRODUCTION•BACKGROUND DYNAMICS•LINEAR PERTURBATION•NON-GAUSSIANITY•SUMMARY AND DISCUSSIONS•ACKNOWLEDGEMENTSReferencesAbstract   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.",

author = "Taichi Kidani and Kazuya Koyama",

year = "2014",

month = jul,

day = "10",

doi = "10.1103/PhysRevD.90.023515",

language = "English",

volume = "90",

pages = "023515 1--17",

journal = "Physical Review D",

issn = "1550-7998",

publisher = "American Institute of Physics Publising LLC",

number = "2",

}

TY - JOUR

T1 - Non-gaussianities in DBI inflation with angular motion

AU - Kidani, Taichi

AU - Koyama, Kazuya

PY - 2014/7/10

Y1 - 2014/7/10

N2 - •INTRODUCTION•BACKGROUND DYNAMICS•LINEAR PERTURBATION•NON-GAUSSIANITY•SUMMARY AND DISCUSSIONS•ACKNOWLEDGEMENTSReferencesAbstract   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.

AB - •INTRODUCTION•BACKGROUND DYNAMICS•LINEAR PERTURBATION•NON-GAUSSIANITY•SUMMARY AND DISCUSSIONS•ACKNOWLEDGEMENTSReferencesAbstract   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.

U2 - 10.1103/PhysRevD.90.023515

DO - 10.1103/PhysRevD.90.023515

M3 - Article

SN - 1550-7998

VL - 90

SP - 235151

EP - 235117

JO - Physical Review D

JF - Physical Review D

IS - 2

ER -

Non-gaussianities in DBI inflation with angular motion

Abstract

Access to Document

Fingerprint

Cite this