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キーワード:
High Energy Physics - Theory, hep-th,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO
要旨:
We look for potential observational degeneracies between canonical and
non-canonical models of inflation of a single field $\phi$. Non-canonical
inflationary models are characterized by higher than linear powers of the
standard kinetic term $X$ in the effective Lagrangian $p(X,\phi)$ 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.
