Rotating a Curvaton Brane in a Warped Throat

Abstract

In this paper we study a curvaton model obtained by considering a probe anti-D3-brane with angular motion at the bottom of a KS throat with approximate isometries. We calculate the spectrum of curvature perturbations and the non-Gaussianities of this model. Specifically, we consider the limit of relativistic rotation of the curvaton brane which leads to a small sound speed, and thus it can be viewed as an implementation of the DBI-curvaton mechanism. We find that the primordial power spectrum is nearly scale-invariant while the non-Gaussianity of local type is sizable and that of equilateral type is usually large and negative. Moreover, we study both the theoretical and observational constraints on this model, and find that there exists a sizable allowed region for the phase space of this model.

11 pages, 4 figures, minor changes, relevant reference added

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Cited by in corpus (17)

• On Classification of Models of Large Local-Type Non-Gaussianity
• Inflation in Entropic Cosmology: Primordial Perturbations and non-Gaussianities
• Dirac-Born-Infeld realization of sound speed resonance mechanism for primordial black holes
• Curvaton with nonminimal derivative coupling to gravity
• Cosmology of the Spinor Emergent Universe and Scale-invariant Perturbations
• Non-Gaussianities of Single Field Inflation with Non-minimal Coupling
• Large Nonlocal Non-Gaussianity from a Curvaton Brane
• Curvaton with Nonminimal Derivative Coupling to Gravity II: Full Perturbation Analysis
• G-Curvaton
• Numerical study of inflationary preheating with arbitrary power-law potential and a realization of curvaton mechanism
• Quadra-Spectrum and Quint-Spectrum from Inflation and Curvaton Models
• Spinflation with Angular Potentials
• On primordial trispectrum from exchanging scalar modes in general multiple field inflationary models
• Revised $f_{\mathrm{NL}}$ parameter in Curvaton Scenario
• Scale dependences of local form non-Gaussianity parameters from a DBI isocurvature field
• Multi-scalar tachyon potential on non-BPS domain walls
• Inhomogeneous Reheating Scenario with DBI fields