Galileon inflation

Abstract

Galileon inflation is a radiatively stable higher derivative model of inflation. The model is determined by a finite number of relevant operators which are protected by a covariant generalization of the Galileon shift symmetry. We show that the nongaussianity of the primordial density perturbation generated during an epoch of Galileon inflation is a particularly powerful observational probe of these models and that, when the speed of sound is small, fNL can be larger than the usual result fNL ~ 1/c_s^2.

13 pages, plus appendices and references. v2: some clarifications in introduction; missing references added. v3: discussion of Sec. IV.B clarified. Matches version published in JCAP. v4: typos corrected in (44)-(47). v5: some improvements to IV.B; sign error fixed in h4 term of (B25) and related numerical error in (47)

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Cited by in corpus (73)

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• Galileons as Wess-Zumino Terms
• Primordial non-Gaussianities in general modified gravitational models of inflation
• Parity breaking signatures from a Chern-Simons coupling during inflation: the case of non-Gaussian gravitational waves
• Dynamical analysis of generalized Galileon cosmology
• General Embedded Brane Effective Field Theories
• Selected topics in scalar-tensor theories and beyond
• Subluminal Galilean Genesis
• Primordial non-Gaussianity from G-inflation
• Riding on irrelevant operators
• Galileon inflation evades the no-go for PBH formation in the single-field framework
• DBI Realizations of the Pseudo-Conformal Universe and Galilean Genesis Scenarios
• A note on the role of the boundary terms for the non-Gaussianity in general k-inflation
• A small cosmological constant from Abelian symmetry breaking
• Potential-driven Galileon inflation
• Generalized SU(2) Proca Theory
• Disformal transformation of cosmological perturbations
• Resonant Trispectrum and a Dozen More Primordial N-point functions
• Positivity Bounds on Dark Energy: When Matter Matters
• Gravitational Waves and Scalar Perturbations from Spectator Fields
• Primordial black holes and induced gravitational waves in $k$-inflation
• Causal Effective Field Theories
• Primordial non-Gaussianity from ultra slow-roll Galileon inflation
• Matter bounce cosmology with a generalized single field: non-Gaussianity and an extended no-go theorem
• Disformal invariance of cosmological perturbations in a generalized class of Horndeski theories
• Scalar induced gravity waves from ultra slow-roll Galileon inflation
• Primordial black holes formation in the inflationary model with field-dependent kinetic term for quartic and natural potentials
• Strong scale dependent bispectrum in the Starobinsky model of inflation
• Enhancing gravitational wave anisotropies with peaked scalar sources
• Instabilities of Spherical Solutions with Multiple Galileons and SO(N) Symmetry
• Realisation of the ultra-slow roll phase in Galileon inflation and PBH overproduction
• Super-Planckian excursions of the inflaton and quantum corrections
• Derivative Chameleons
• Non-Gaussian inflationary shapes in $G^3$ theories beyond Horndeski
• Mechanism of primordial black holes production and secondary gravitational waves in $\alpha$-attractor Galileon inflationary scenario
• $\alpha$ attractors in Quintessential Inflation motivated by Supergravity
• Large fluctuations and Primordial Black Holes
• Positivity bounds from multiple vacua and their cosmological consequences
• A geometrical approach to degenerate scalar-tensor theories
• Quintessential Inflation from Lorentzian Slow Roll
• Scalar Fields Near Compact Objects: Resummation versus UV Completion
• Probing the speed of gravity with LVK, LISA, and joint observations
• Stealth black holes in shift symmetric kinetic gravity braiding
• Gravitational Wave from Axion-SU(2) Gauge Fields: Effective Field Theory for Kinetically Driven Inflation
• Differentiating G-inflation from String Gas Cosmology using the Effective Field Theory Approach
• Light mass galileon and late time acceleration of the Universe
• Primordial Black Holes from Effective Field Theory of Stochastic Single Field Inflation at NNNLO
• Primordial Black Holes Dark Matter and Secondary Gravitational Waves from Warm Higgs-G Inflation
• First-order thermodynamics of Horndeski cosmology
• Lyth Bound, eternal inflation and future cosmological missions
• Self-tuning kinetic gravity braiding: Cosmological dynamics, shift symmetry, and the tadpole
• Hair-dressing Horndeski: an approach to hairy solutions in cubic Horndeski gravity
• Phantom attractors in Kinetic Gravity Braiding theories: a dynamical system approach
• Constraining Galileon Inflation
• Dark energy with a shift-symmetric scalar field: obstacles, loophole hunting and dead ends
• Mild quasi-local non-Gaussianity as a signature of modified gravity during inflation
• Non-minimal Energy-momentum squared gravity
• Generalized disformal invariance of cosmological perturbations with second-order field derivatives
• Constraining cosmological scaling solutions of a Galileon field
• Dynamical system analysis in modified Galileon cosmology
• Non-perturbative quantum Galileon in the exact renormalization group
• Realization of blue spectrum in generalized Galileon super-inflation models
• Consistency Relation and Non-Gaussianity in a Galileon Inflation
• Inflation and Cyclotron Motion
• Galileon versus Quintessence: A comparative phase space analysis and late-time cosmic relevance
• Weakly Broken Galileon Symmetry in Cosmology
• Inflation from a generalized exponential plateau: towards extra suppressed tensor-to-scalar ratios
• Cosmological aspects of cubic Galileon massive gravity