On non-Gaussianities in two-field poly-instanton inflation

Article

DOI: 10.1007/JHEP03(2013)061

Cite this article as:
Gao, X. & Shukla, P. J. High Energ. Phys. (2013) 2013: 61. doi:10.1007/JHEP03(2013)061

Abstract

In the context of Type IIB LARGE volume orientifold setup equipped with poly-instanton corrections, the standard single-field poly-instanton inflation driven by a ‘Wilson’ divisor volume modulus is generalized by the inclusion of respective axion modulus. This two-field dynamics results in a “Roulette” type inflation with the presence of several inflationary trajectories which could produce 50 (or more) e-foldings. The evolution of various trajectories along with physical observables are studied. The possibility of generating primordial non-Gaussianities in the slow-roll as well as in the beyond slow-roll region is investigated. We find that although the non-linearity parameters are quite small during the slow-roll regime, the same are significantly enhanced in the beyond slow-roll regime investigated up to the end of inflation.

Keywords

Strings and branes phenomenology 

Copyright information

© SISSA, Trieste, Italy 2013

Authors and Affiliations

  1. 1.Max-Planck-Institut für Physik (Werner-Heisenberg-Institut)MünchenGermany
  2. 2.State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of SciencesBeijingChina

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