Large N Cosmology

Details Large N Cosmology Large N Cosmology

2003-12-24

arxiv.org/abs/hep-th/0312288v3

JCAP 0411 (2004) 011

Physics

High Energy Physics

High Energy Physics - Theory

LaTex file, 22 pages, references added

Scientific paper

10.1088/1475-7516/2004/11/011

We motivate inflationary scenarios with many scalar fields, and give a complete formulation of adiabatic and entropy perturbations. We find that if the potential is very flat, or if the theory has a SO(N) symmetry, the calculation of the fluctuation spectrum can be carried out in terms of merely two variables without any further assumption. We do not have to assume slow roll or SO(N) invariance for the background fields. We give some examples to show that, even if the slow roll assumption holds, the spectrum of fluctuations can be quite different from the case when there is a single inflaton.

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