Inflationary Dynamics with Runaway Potentials

Details Inflationary Dynamics with Runaway Potentials Inflationary Dynamics with Runaway Potentials

2002-10-28

arxiv.org/abs/astro-ph/0210597v2

Phys.Rev. D69 (2004) 083516

Astronomy and Astrophysics

Astrophysics

Paper significantly expanded: additional material on perturbations added, Title change reflects the more general discussion on

Scientific paper

10.1103/PhysRevD.69.083516

The evolution of two slow--rolling scalar fields with potentials of the form $V=V_0 \phi^{-\alpha}\exp(-\beta \phi^m)$ is studied. Considering different values of the parameters $\alpha$, $\beta$ and $m$, we derive several new inflationary solutions in which one fields just evolves in the background and is not important for the inflationary dynamics. In addition, we find new solutions where both fields are dynamically important during inflation. Moreover, we discuss the evolution of perturbations in both scalar fields and the spacetime metric, concentrating on the production of entropy perturbations. We find that for a large region in parameter space and initial conditions tensor modes are negligible and that adiabatic and isocurvature perturbations are essentially uncorrelated.

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