Non-Gaussianity of Racetrack Inflation Models

2006/04/30 by Cheng-Yi Sun, Dehai Zhang, De-Hai Zhang · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph

paper · pdf · doi:10.1088/0253-6102/48/1/038

published as Commun.Theor.Phys.48:189-192,2007 · 8 pages, no figures; PACS and Keywords are added; mistake is corrected

arxiv created 2006/05/22 · openalex publication_date 2007/07/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30

Abstract

In this paper, we use the result in [C.Y. Sun and D.H. Zhang, arXiv:astro-ph/0510709] to calculate the non-Gaussianity of the racetrack models in [J.J. Blanco-Pillado, et al. , JHEP 0411 (2004) 063; arXiv:hep-th/0406230] and [J.J. Blanco-Pillado, et al. , arXiv:hep-th/0603129]. The two models give different non-Gaussianities. Both of them are reasonable. However, we find that, for multi-field inflationary models with the non-trivial metric of the field space, the condition of the slow-roll cannot guarantee small non-Gaussianities.

Citations

• Racetrack Inflation
• Non-Gaussian features of primordial fluctuations in single field inflationary models
• A General Analytic Formula for the Spectral Index of the Density Perturbations produced during Inflation
• Particle Physics Models of Inflation and the Cosmological Density Perturbation
• de Sitter Vacua in String Theory
• Non-Gaussianity from the second-order cosmological perturbation

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