• Aug 23 2011

    Dr Rhiannon Gwyn (King's College)

    The National Institute for Theoretical Physics, and the Centre for Theoretical Physics, School of Physics, would like to invite to its coming talk in the theory seminar series, entitled:

    "Aspects of Non-Canonical Inflation"

    to be presented by Dr. Rhiannon Gwyn (King's college)

    Abstract: We study inflation in single-field models with non-canonical kinetic terms of the form X^n, where X = 1/2 . phi^2. These terms arise naturally in an EFT approach to modeling inflation, and can also be seen to arise from certain string theory embeddings, such as DBI inflation.
    We have been able to give a general formalism for finding solutions of the equations of motion corresponding to non-canonical inflation, which can be shown to be an attractor in phase space wherever it exists.
    However, not every Lagrangian with higher-derivative kinetic operators supports non-canonical inflation, and not every set of initial conditions in a suitable theory will give rise to an inflationary trajectory. We give some sufficient conditions required for a Lagrangian to support inflation in the non-canonical regime, and investigate the problem of fine-tuning. We find that non-canonical kinetic terms tend to reduce the severity of the fine-tuning problem in general.

    Date: Tuesday, 23rd August 2011
    Venue: Frank Nabarro Lecture Theatre P216
    Time: 13.20 - 14.10

    For more information please contact:
    Alan S. Cornell

    School of Physics
    University of the Witwatersrand
    Private Bag 3
    Wits 2050
    South Africa