### Abstract

The k-inflation models can give rise to large non-Gaussianities of primordial density perturbations because the field propagation speed is different from the speed of light. For assisted k-inflation models in which multiple scalar fields join an effective singlefield attractor, we evaluate three observables: (i) the spectral index n_{s} of curvature perturbations, (ii) the tensor-to-scalar ratio r, and (iii) the non-Gaussianity parameter f_{nl}. This will be useful to constrain such models from future high-precision observations of the temperature anisotropies in Cosmic Microwave Background (CMB).

Original language | English |
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Pages | 315-318 |

Number of pages | 4 |

Publication status | Published - 2010 |

Externally published | Yes |

Event | 20th Workshop on General Relativity and Gravitation in Japan, JGRG 2010 - Kyoto, Japan Duration: 2010 Sep 21 → 2010 Sep 25 |

### Other

Other | 20th Workshop on General Relativity and Gravitation in Japan, JGRG 2010 |
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Country | Japan |

City | Kyoto |

Period | 10/9/21 → 10/9/25 |

### ASJC Scopus subject areas

- Atomic and Molecular Physics, and Optics

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## Cite this

Ohashi, J., & Tsujikawa, S. (2010).

*Observational constraints on assisted k-inflation*. 315-318. Paper presented at 20th Workshop on General Relativity and Gravitation in Japan, JGRG 2010, Kyoto, Japan.