Curvatons in Warped Throats

Journal Article · Wed Jun 23 00:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3462694· OSTI ID:21410199

Kobayashi, Takeshi ^[1]; Mukohyama, Shinji ^[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)

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].

• OSTI ID: 21410199
• Journal Information: AIP Conference Proceedings, Vol. 1241, 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; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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