Non-Gaussianity, Spectral Index and Tensor Modes in Mixed Inflaton and Curvaton Models

Ichikawa, Kazuhide; Suyama, Teruaki; Takahashi, Tomo; Yamaguchi, Masahide; Kodama, Hideo; Ioka, Kunihito

doi:10.1063/1.2981533

Cited by 12 publications

(15 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nor do we restrict the epochs during which σ can dominate the energy content of the Universe. Assuming that the inflaton energy density decreases as matter after inflation and before it decays into radiation, this leaves us with 10 possible cases (including situations where σ drives a secondary phase of inflation [35,[43][44][45]), see Fig. 2, that we study one by one.…”

Section: Introduction and Summary Of The Main Resultsmentioning

confidence: 99%

Encyclopædia curvatonis

Vennin

Koyama

Wands

2015

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

Abstract. We investigate whether the predictions of single-field models of inflation are robust under the introduction of additional scalar degrees of freedom, and whether these extra fields change the potentials for which the data show the strongest preference. We study the situation where an extra light scalar field contributes both to the total curvature perturbations and to the reheating kinematic properties. Ten reheating scenarios are identified, and all necessary formulas allowing a systematic computation of the predictions for this class of models are derived. They are implemented in the public library ASPIC, which contains more than 75 single-field potentials. This paves the way for a forthcoming full Bayesian analysis of the problem. A few representative examples are displayed and discussed.

show abstract

Section: Introduction and Summary Of The Main Resultsmentioning

confidence: 99%

Encyclopædia curvatonis

Vennin

Koyama

Wands

2015

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

“…However the curvaton model can easily generate a large local-type non-Gaussianity [4,5,6,7,13,14,15,16]. See [17] for a nice review and see [18,19,20,21,22,23,24,25,26,27,28,29] for the recent relevant discussions.…”

Section: +0014mentioning

confidence: 99%

A curvaton with a polynomial potential

Huang

2008

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

In general a weakly self-interacting curvaton field is expected and the curvaton potential takes the polynomial form. The curvaton potential can be dominated by the self-interaction term during the period of inflation if the curvaton field stays at a large vacuum expectation value. We use the δN formalism to calculate the primordial curvature perturbation in the various possible scenarios which make the curvaton model much richer.

show abstract

“…In fact, one could build a curvaton scenario where the perturbations are not generated by the inflaton, but by another modulus which plays the rôle of the curvaton [115]. The scale of the potential could be set such that TeV-scale supersymmetry is achieved and the model would predict large non-gaussianities in the CMB spectrum [116]. This is very important to make contact with experiments since the PLANCK satellite is probably going to give an observational answer to the fundamental question of the existence of large non-gaussianities in the CMB.…”

Section: Discussionmentioning

confidence: 99%

“…In this case, it is likely that it would be possible to obtain inflation and set, at the same time, V ∼ 10 15 l 6 s . However, tensor modes would not be observable anymore, even though possible large non-gaussianities could be produced [116].…”

Section: The Type Iib Large Volume Scenariomentioning

confidence: 99%

String loop moduli stabilisation and cosmology in IIB flux compactifications

Cicoli¹

2010

Fortschritte der Physik

View full text Add to dashboard Cite

We present a detailed review of the moduli stabilisation mechanism and possible cosmological implications of the LARGE Volume Scenario (LVS) that emerges naturally in the context of type IIB Calabi‐Yau flux compactifications. After a quick overview of physics beyond the Standard Model, we present string theory as the most promising candidate for a consistent theory of quantum gravity. We then give a pedagogical introduction to type IIB compactifications on Calabi‐Yau orientifolds where most of the moduli are stabilised by turning on background fluxes. However in order to fix the Kähler moduli one needs to consider several corrections beyond the leading order approximations. After presenting a survey of all the existing solutions to this problem, we derive the topological conditions on an arbitrary Calabi‐Yau to obtain the LVS since it requires no fine‐tuning of the fluxes and provides a natural solution of the hierarchy problem. After performing a systematic study of the behaviour of string loop corrections for general type IIB compactifications, we show how they play a crucial rôle to achieve full Kähler moduli stabilisation in the LVS. Before examining the possible cosmological implication of these scenarios, we present a broad overview of string cosmology. We then notice how, in the case of K3‐fibrations, string loop corrections give rise naturally to an inflationary model which yields observable gravity waves. We finally study the finite‐temperature behaviour of the LVS and discuss prospects for future work.

show abstract

Non-Gaussianity, Spectral Index and Tensor Modes in Mixed Inflaton and Curvaton Models

Cited by 12 publications

References 40 publications

Encyclopædia curvatonis

Encyclopædia curvatonis

A curvaton with a polynomial potential

String loop moduli stabilisation and cosmology in IIB flux compactifications

Contact Info

Product

Resources

About