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Title: Curvatons in Warped Throats

Abstract

We present a curvaton model from type IIB string theory compactified on a warped throat with approximate isometries. Considering an (anti-)D3-brane sitting at the throat tip as a prototype standard model brane, we show that the brane's position in the isometry directions can play the role of curvatons. The basic picture is that the fluctuations of the (anti-)D3-brane in the angular isometry directions during inflation eventually turns into the primordial curvature perturbations, and subsequently the brane's oscillation excites other open string modes on the brane and reheat the universe. We find in the explicit case of the KS throat that a wide range of parameters allows a consistent curvaton scenario. It is also shown that the oscillations of branes at throat tips are capable of producing large non-Gaussianity, either through curvature or isocurvature perturbations. Since such setups naturally arise in warped (multi-)throat compactifications and are constrained by observational data, the model can provide tests for compactification scenarios. This work gives an explicit example of string theory providing light fields for generating curvature perturbations. Such mechanisms free the inflaton from being responsible for the perturbations, thus open up new possibilities for inflation models. The discussions in this paper are based onmore » [1].« less

Authors:
 [1];  [2]
  1. Institute for Cosmic Ray Research, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582 (Japan)
  2. Institute for the Physics and Mathematics of the Universe (IPMU), The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582 (Japan)
Publication Date:
OSTI Identifier:
21410199
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1241; Journal Issue: 1; Conference: Conference on invisible universe, Paris (France), 29 Jun - 3 Jul 2009; Other Information: DOI: 10.1063/1.3462694; (c) 2010 American Institute of Physics; Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; APPROXIMATIONS; BRANES; COMPACTIFICATION; COSMOLOGY; D-BRANES; DISTURBANCES; FLUCTUATIONS; OSCILLATIONS; PERTURBATION THEORY; STANDARD MODEL; STRING MODELS; STRING THEORY; UNIVERSE; CALCULATION METHODS; COMPOSITE MODELS; EXTENDED PARTICLE MODEL; FIELD THEORIES; GRAND UNIFIED THEORY; MATHEMATICAL MODELS; M-THEORY; PARTICLE MODELS; QUANTUM FIELD THEORY; QUARK MODEL; UNIFIED GAUGE MODELS; VARIATIONS

Citation Formats

Kobayashi, Takeshi, and Mukohyama, Shinji. Curvatons in Warped Throats. United States: N. p., 2010. Web. doi:10.1063/1.3462694.
Kobayashi, Takeshi, & Mukohyama, Shinji. Curvatons in Warped Throats. United States. https://doi.org/10.1063/1.3462694
Kobayashi, Takeshi, and Mukohyama, Shinji. 2010. "Curvatons in Warped Throats". United States. https://doi.org/10.1063/1.3462694.
@article{osti_21410199,
title = {Curvatons in Warped Throats},
author = {Kobayashi, Takeshi and Mukohyama, Shinji},
abstractNote = {We present a curvaton model from type IIB string theory compactified on a warped throat with approximate isometries. Considering an (anti-)D3-brane sitting at the throat tip as a prototype standard model brane, we show that the brane's position in the isometry directions can play the role of curvatons. The basic picture is that the fluctuations of the (anti-)D3-brane in the angular isometry directions during inflation eventually turns into the primordial curvature perturbations, and subsequently the brane's oscillation excites other open string modes on the brane and reheat the universe. We find in the explicit case of the KS throat that a wide range of parameters allows a consistent curvaton scenario. It is also shown that the oscillations of branes at throat tips are capable of producing large non-Gaussianity, either through curvature or isocurvature perturbations. Since such setups naturally arise in warped (multi-)throat compactifications and are constrained by observational data, the model can provide tests for compactification scenarios. This work gives an explicit example of string theory providing light fields for generating curvature perturbations. Such mechanisms free the inflaton from being responsible for the perturbations, thus open up new possibilities for inflation models. The discussions in this paper are based on [1].},
doi = {10.1063/1.3462694},
url = {https://www.osti.gov/biblio/21410199}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1241,
place = {United States},
year = {Wed Jun 23 00:00:00 EDT 2010},
month = {Wed Jun 23 00:00:00 EDT 2010}
}