Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-12-10
Phys.Rev. D59 (1999) 123501
Astronomy and Astrophysics
Astrophysics
9 pages, 2 figures, latex with revtex and epsf
Scientific paper
10.1103/PhysRevD.59.123501
We investigate the dynamics of the recently proposed model of assisted inflation. In this model an arbitrary number of scalar fields with exponential potentials evolve towards an inflationary scaling solution, even if each of the individual potentials is too steep to support inflation on its own. By choosing an appropriate rotation in field space we can write down explicitly the potential for the weighted mean field along the scaling solution and for fields orthogonal to it. This demonstrates that the potential has a global minimum along the scaling solution. We show that the potential close to this attractor in the rotated field space is analogous to a hybrid inflation model, but with the vacuum energy having an exponential dependence upon a dilaton field. We present analytic solutions describing homogeneous and inhomogeneous perturbations about the attractor solution without resorting to slow-roll approximations. We discuss the curvature and isocurvature perturbation spectra produced from vacuum fluctuations during assisted inflation.
Malik Karim A.
Wands David
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