Relations between canonical and non-canonical inflation

Abstract

We look for potential observational degeneracies between canonical and non-canonical models of inflation of a single field $\varphi$. Non-canonical inflationary models are characterized by higher than linear powers of the standard kinetic term $X$ in the effective Lagrangian $p(X,\varphi )$ and arise for instance in the context of the Dirac-Born-Infeld (DBI) action in string theory. An on-shell transformation is introduced that transforms non-canonical inflationary theories to theories with a canonical kinetic term. The 2-point function observables of the original non-canonical theory and its canonical transform are found to match in the case of DBI inflation.

LaTeX, 1 + 29 pages, 7 figures. Version 2: added clarifications and references

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Cited by in corpus (16)

• Non-Canonical Inflation and Primordial Black Holes Production
• Primordial black holes and gravitational waves from non-canonical inflation
• Extension of warm inflation to noncanonical scalar fields
• Brane Constant-roll Inflation
• Warm Tachyon Inflation and Swampland Criteria
• Beta-function formalism for k-essence constant-roll inflation
• Cosmological dynamics of the general non-canonical scalar field models
• On degenerate models of cosmic inflation
• Inflation with non-canonical scalar fields revisited
• Non-Canonical Inflation in Supergravity
• Primordial non-Gaussianity in noncanonical warm inflation
• Dynamic analysis of noncanonical warm inflation
• DBI Inflation and Warped Black Holes
• Hamilton-Jacobi formalism for k-inflation
• Primordial non-Gaussianity in noncanonical warm inflation with nonminimal derivative coupling
• Reconstructing square-law k-inflation from Planck data