Trispectrum from Co-dimension 2(n) Galileons
arXiv:1303.5015 · doi:10.1088/1475-7516/2013/12/033
Abstract
A generalized theory of multi-field galileons has been recently put forward. This model stems from the ongoing effort to embed generic galileon theories within brane constructions. Such an approach has proved very useful in connecting interesting and essential features of these theories with geometric properties of the branes embedding. We investigate the cosmological implications of a very restrictive multi-field galileon theory whose leading interaction is solely quartic in the scalar field and lends itself nicely to an interesting cosmology. The trispectrum of curvature fluctuations has features which are quite distinctive with respect to their P(X,ϕ) counterpart. We also show that, despite an absent cubic Lagrangian in the full theory, non-Gaussianities in this model cannot produce the combination a of small bispectrum alongside with a large trispectrum. We further expand on this point to draw a lesson on what having a symmetry in the full background independent theory entails at the level of fluctuations and vice-versa.
20 pages, 8 figures, typos corrected, references added. Version matching the one published on JCAP
References in corpus (27)
- The Effective Field Theory of Inflation
- Covariant Galileon
- Generalized Galileons: All scalar models whose curved background extensions maintain second-order field equations and stress tensors
- Effective Field Theory for Inflation
- Avoiding Dark Energy with 1/R Modifications of Gravity
- Galileon inflation
- DBI and the Galileon reunited
- Primordial perturbations and non-Gaussianities in DBI and general multi-field inflation
- Multi-field galileons and higher co-dimension branes
- The Inflationary Trispectrum for Models with Large Non-Gaussianities
- Higher derivative theories with constraints : Exorcising Ostrogradski's Ghost
- Bi-galileon theory I: motivation and formulation
- Primordial non-Gaussianity from the DBI Galileons
- Dynamical analysis of generalized Galileon cosmology
- Large non-Gaussianities in the Effective Field Theory Approach to Single-Field Inflation: the Trispectrum
- A Naturally Large Four-Point Function in Single Field Inflation
- Multi-galileons, solitons and Derrick's theorem
- Seed perturbations for primordial magnetic fields from MSSM flat directions
- On the full quantum trispectrum in multi-field DBI inflation
- Lorentz boost and non-Gaussianity in multi-field DBI-inflation
- Derrick's theorem beyond a potential
- Optimal Trispectrum Estimators and WMAP Constraints
- DBI Galileon in the Effective Field Theory of Inflation: Orthogonal non-Gaussianities and constraints from the Trispectrum
- Tilt and Running of Cosmological Observables in Generalized Single-Field Inflation
- On the Trispectrum of Galileon Inflation
- The Trispectrum in the Effective Theory of Inflation with Galilean symmetry
- Effective Field Theory for Inflation
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- Beyond the Cosmological Standard Model
- Gravitational Waves and Scalar Perturbations from Spectator Fields
- On the Trispectrum of Galileon Inflation
- Covariant second-order perturbations in generalized two-field inflation
- Gradient expansion of superhorizon perturbations in G-inflation
- Halo/Galaxy Bispectrum with Equilateral-type Primordial Trispectrum