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Relations between canonical and non-canonical inflation

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons79381

Gwyn,  Rhiannon
Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, Golm, DE;

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1212.4135
(Preprint), 2MB

JCAP_2013_12_010.pdf
(Any fulltext), 2MB

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Citation

Gwyn, R., Rummel, M., & Westphal, A. (2013). Relations between canonical and non-canonical inflation. Journal of Cosmology and Astroparticles Physics, (12): 010. doi:10.1088/1475-7516/2013/12/010.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-74C5-D
Abstract
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.