New DBI Inflation model with Kinetic Coupling to Einstein Gravity

Abstract

In this paper we study a new class of inflation models which generalize the Dirac-Born-Infeld (DBI) action with the addition of a nonminimal kinetic coupling (NKC) term. We dubbed this model as the {\it new DBI inflation model}. The NKC term does not bring new dynamical degree of freedom, so the equations of motion remain of second order. However, with such a coupling, the action is no longer linear with respect to the Einstein curvature term ($R$ or $G^{\mu \nu }$), which leads to a correction term of $k^4$ in the perturbations. The new DBI inflation model can be viewed as theories beyond Horndeski. Without violating nearly scale-invariance, such a correction may lead to new effects on the inflationary spectra that could be tested by future observations.

6 pages, no figure

References in corpus (21)

• Covariant Galileon
• Observational Signatures and Non-Gaussianities of General Single Field Inflation
• Healthy theories beyond Horndeski
• Generalized Galileons: All scalar models whose curved background extensions maintain second-order field equations and stress tensors
• Imperfect Dark Energy from Kinetic Gravity Braiding
• G-inflation: inflation driven by the Galileon field
• Unifying framework for scalar-tensor theories of gravity
• The Inflationary Trispectrum for Models with Large Non-Gaussianities
• UV-Protected Inflation
• Multifield DBI Inflation and Non-Gaussianities
• DBI Inflation in the Tip Region of a Warped Throat
• Cosmology of the proxy theory to massive gravity
• Primordial perturbation with a modified dispersion relation
• N-flation from multiple DBI type actions
• Fab 5: Noncanonical Kinetic Gravity, Self Tuning, and Cosmic Acceleration
• Observing the Geometry of Warped Compactification via Cosmic Inflation
• Dirac-Born-Infeld action from spontaneous breakdown of Lorentz symmetry in brane-world scenarios
• Spatially covariant theories of gravity: disformal transformation, cosmological perturbations and the Einstein frame
• Curvaton with Nonminimal Derivative Coupling to Gravity II: Full Perturbation Analysis
• Inflationary gravitational waves in the effective field theory of modified gravity
• Primordial non-Gaussianities of gravitational waves beyond Horndeski

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• Mimetic DBI Inflation in Confrontation with Planck2018 data
• Reheating mechanism of Curvaton with Nonminimal Derivative Coupling to Gravity
• Assessing the foundation and applicability of some dark energy fluid models in the Dirac-Born-Infeld framework
• Testing kinetically coupled inflation models with CMB distortions
• Potential-driven Inflation with Disformal Coupling to Gravity
• Confronting the Potential-driven DBI-inspired nonminimal kinetic coupling (Dinkic) inflation to the observational data
• Viable Intermediate Inflation in the Mimetic DBI Model