Statistical Anisotropy from Vector Curvaton in D-brane Inflation
arXiv:1108.4424 · doi:10.1016/j.nuclphysb.2012.11.010
Abstract
We investigate the possibility of embedding the vector curvaton paradigm in D-brane models of inflation in Type IIB string theory in a simple toy model. The vector curvaton is identified with the U(1) gauge field that lives on the world volume of a D3-brane, which may be stationary or undergoing general motion in the internal space. The dilaton is considered as a spectator field which modulates the evolution of the vector field. In this set up, the vector curvaton is able to generate measurable statistical anisotropy in the spectrum and bispectrum of the curvature perturbation assuming that the dilaton evolves as e^(-ϕ)\propto a^2 where a(t) is the scale factor. Our work constitutes a first step towards exploring how such distinctive features may arise from the presence of several light fields that naturally appear in string theory models of cosmology.
44 pages, 1 figure. Several clarifications, some new results added: section 3 expanded and improved; section 4 and 5 merged. Typos corrected, references added. Matches version to appear in NPB
References in corpus (32)
- Observational Signatures and Non-Gaussianities of General Single Field Inflation
- Inflationary Universe with Anisotropic Hair
- String Cosmology: A Review
- Instability of anisotropic cosmological solutions supported by vector fields
- The Nature of Primordial Fluctuations from Anisotropic Inflation
- Cosmic Microwave Background Statistics for a Direction-Dependent Primordial Power Spectrum
- A Delicate Universe
- Statistical Anisotropy from Anisotropic Inflation
- Scalar-Scalar, Scalar-Tensor, and Tensor-Tensor Correlators from Anisotropic Inflation
- Predictions from an anisotropic inflationary era
- Anisotropic Power-law Inflation
- Can a vector field be responsible for the curvature perturbation in the Universe?
- Instability of the ACW model, and problems with massive vectors during inflation
- The Axis of Evil revisited
- Imprints of anisotropic inflation on the cosmic microwave background
- Spinflation
- Holographic Systematics of D-brane Inflation
- Anisotropic non-Gaussianity from vector field perturbations
- Heating in Brane Inflation and Hidden Dark Matter
- Gravitational Wave Constraints on DBI Inflation
- Particle Production of Vector Fields: Scale Invariance is Attractive
- Challenges for String Cosmology
- Inflation from Wrapped Branes
- Non-minimally coupled vector curvaton
- Parity Violating Statistical Anisotropy
- Supergravity inspired Vector Curvaton
- On the health of a vector field with (R A^2)/6 coupling to gravity
- Wilson Line Inflation
- Gravitational Wave Constraints on Multi-Brane Inflation
- Warped Wilson Line DBI Inflation
- Eliminating the eta-problem in SUGRA Hybrid Inflation with Vector Backreaction
- Reheating a multi-throat universe by brane motion
Cited by in corpus (20)
- Gauge Fields and Inflation
- The anisotropic power spectrum and bispectrum in the f(phi) F^2 mechanism
- Gravity waves and non-Gaussian features from particle production in a sector gravitationally coupled to the inflaton
- Observable non-gaussianity from gauge field production in slow roll inflation, and a challenging connection with magnetogenesis
- Dark D-brane Cosmology
- Coupled three-form dark energy
- Parity Violating Statistical Anisotropy
- Primordial Statistical Anisotropies: The Effective Field Theory Approach
- The charged inflaton and its gauge fields: preheating and initial conditions for reheating
- Curvature Perturbations from a Massive Vector Curvaton
- Anisotropic Inflation with Derivative Couplings
- Disformal vectors and anisotropies on a warped brane
- Anisotropic power-law inflation for a conformal-violating Maxwell model
- Effective field theory of statistical anisotropies for primordial bispectrum and gravitational waves
- D-brane Disformal Coupling and Thermal Dark Matter
- An Hamilton-Jacobi formulation of anisotropic inflation
- Inflationary buildup of a vector field condensate and its cosmological consequences
- CMB Anomalies from Imperfect Dark Energy: Confrontation with the Data
- Thermal Inflation with a Thermal Waterfall Scalar Field Coupled to a Light Spectator Scalar Field
- D-branes and cosmic structure