DBI Realizations of the Pseudo-Conformal Universe and Galilean Genesis Scenarios
arXiv:1209.5742 · doi:10.1088/1475-7516/2012/12/030
Abstract
The pseudo-conformal universe is an alternative to inflation in which the early universe is described by a conformal field theory on approximately flat space-time. The fields develop time-dependent expectation values, spontaneously breaking the conformal symmetries to a de Sitter subalgebra, and fields of conformal weight zero acquire a scale invariant spectrum of perturbations. In this paper, we show that the pseudo-conformal scenario can be naturally realized within theories that would ordinarily be of interest for DBI inflation, such as the world-volume theory of a probe brane in an AdS bulk space-time. In this approach, the weight zero spectator field can be associated with a geometric flat direction in the bulk, and its scale invariance is protected by a shift symmetry.
34 pages
References in corpus (39)
- New Ekpyrotic Cosmology
- Galilean Genesis: an alternative to inflation
- Galileon inflation
- DBI and the Galileon reunited
- Primordial perturbations and non-Gaussianities in DBI and general multi-field inflation
- Generating Ekpyrotic Curvature Perturbations Before the Big Bang
- Tensor Modes from a Primordial Hagedorn Phase of String Cosmology
- Probing String Theory with Modulated Cosmological Fluctuations
- Symmetries for Galileons and DBI scalars on curved space
- Primordial fluctuations and non-Gaussianities in multi-field DBI inflation
- String Gas Cosmology and Structure Formation
- Non-Gaussianities in New Ekpyrotic Cosmology
- Primordial non-Gaussianity from the DBI Galileons
- Galileons as Wess-Zumino Terms
- Non-Gaussianities from ekpyrotic collapse with multiple fields
- General Embedded Brane Effective Field Theories
- Spinflation
- Comparing Infrared Dirac-Born-Infeld Brane Inflation to Observations
- Harrison--Zeldovich spectrum from conformal invariance
- Multifield DBI Inflation and Non-Gaussianities
- Speedy sound and cosmic structure
- On the Initial Conditions in New Ekpyrotic Cosmology
- Curvature perturbations from ekpyrotic collapse with multiple fields
- Gravitational Wave Constraints on DBI Inflation
- On the full quantum trispectrum in multi-field DBI inflation
- Lorentz boost and non-Gaussianity in multi-field DBI-inflation
- More on the Spectrum of Perturbations in String Gas Cosmology
- Generating Scale-Invariant Perturbations from Rapidly-Evolving Equation of State
- Consistency Relations for the Conformal Mechanism
- Near Scale Invariance with Modified Dispersion Relations
- Towards a Cosmological Dual to Inflation
- Seeding of Primordial Perturbations During a Decelerated Expansion
- Cosmological density perturbations from conformal scalar field: infrared properties and statistical anisotropy
- Scalar tilt from broken conformal invariance
- Scalar perturbations in conformal rolling scenario with intermediate stage
- A Briefing on the Ekpyrotic/Cyclic Universe
- Scale Invariance via a Phase of Slow Expansion
- On Primordial Density Perturbation and Decaying Speed of Sound
- Non-Gaussianities in multi-field DBI inflation with a waterfall phase transition
Cited by in corpus (16)
- Beyond the Cosmological Standard Model
- Horndeski theory and beyond: a review
- Dynamical analysis of generalized Galileon cosmology
- Inflation from Minkowski Space
- Generalized Galilean Genesis
- Consistency Relations for the Conformal Mechanism
- Pre-inflationary primordial perturbations
- Inequivalence of Coset Constructions for Spacetime Symmetries
- Multiple Soft Limits of Cosmological Correlation Functions
- On the Initial State and Consistency Relations
- Pre-inflationary genesis with CMB B-mode polarization
- Scale-invariant perturbations from NEC violation: A new variant of Galilean Genesis
- A Positive Energy Theorem for P(X,phi) Theories
- Conformal Universe as false vacuum decay
- Perturbations on and off de Sitter brane in anti-de Sitter bulk
- Weakly Broken Galileon Symmetry in Cosmology