2012/12/31 by Rhiannon Gwyn, Markus Rummel, Alexander Westphal · 2 citations
Physics and Astronomy · #Action (physics) #Black Holes and Theoretical Physics #Canonical coordinates #Canonical transformation #Context (archaeology) #Cosmology and Gravitation Theories #Field (mathematics) #Inflation (cosmology) #Kinetic term #Lagrangian #Noncommutative and Quantum Gravity Theories #Observable #String theory #astro-ph.CO #hep-th
paper · pdf · doi:10.1088/1475-7516/2013/12/010
published as JCAP 1312 (2013) 010 · LaTeX, 1 + 29 pages, 7 figures. Version 2: added clarifications and references
openalex publication_date 2013/12/05 · arxiv created 2014/02/27 · arxiv updated 2015/06/12 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We look for potential observational degeneracies between canonical and non-canonical models of inflation of a single field ϕ. Non-canonical inflationary models are characterized by higher than linear powers of the standard kinetic term X in the effective Lagrangian p ( X ,ϕ) 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.