Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-11-28
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 2 figures. Talk given at COSMO-01 Workshop, Rovaniemi, Finland, August 30 - September 4, 2001
Scientific paper
The calculation of scalar gravitational and matter perturbations during multiple-field inflation valid to first order in slow roll is discussed. These fields may be the coordinates of a non-trivial field manifold and hence have non-minimal kinetic terms. A basis for these perturbations determined by the background dynamics is introduced, and the slow-roll functions are generalized to the multiple-field case. Solutions for a perturbation mode in its three different behavioural regimes are combined, leading to an analytic expression for the correlator of the gravitational potential. Multiple-field effects caused by the coupling to the field perturbation perpendicular to the field velocity can even contribute at leading order. This is illustrated numerically with an example of a quadratic potential. (The material here is based on previous work by the authors presented in hep-ph/0107272.)
Nibbelink Stefan Groot
van Tent J. W. B.
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