Relations between canonical and non-canonical inflation

Journal Article · Sun Dec 01 00:00:00 EST 2013 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2013/12/010· OSTI ID:22369879

Gwyn, Rhiannon ^[1]; Rummel, Markus ^[2]; Westphal, Alexander ^[3]

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1. AEI Max-Planck-Institut für Gravitationsphysik, Am Mühlenberg 1, D-14476 Potsdam (Germany)
2. II. Institut für Theoretische Physik der Universität Hamburg, Luruper Chaussee 149, D-22761 Hamburg (Germany)
3. Deutsches Elektronen-Synchrotron DESY, Theory Group, Luruper Chaussee 149, D-22603 Hamburg (Germany)

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.

• OSTI ID: 22369879
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2013, Issue 12; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BORN-INFELD THEORY
LAGRANGIAN FUNCTION
POTENTIALS
STRING MODELS
STRING THEORY
COSMOLOGICAL INFLATION