Successful Supersymmetric Inflation
arXiv:hep-ph/9506283 · doi:10.1016/0550-3213(96)00013-2
Abstract
We reconsider the problems of cosmological inflation in effective supergravity theories. A singlet field in a hidden sector is demonstrated to yield an acceptable inflationary potential, without fine tuning. In the simplest such model, the requirement of generating the microwave background anisotropy measured by COBE fixes the inflationary scale to be about GeV, implying a reheat temperature of order GeV. This is low enough to solve the gravitino problem but high enough to allow baryogenesis after inflation. Such consistency requires that the generation of gravitational waves be negligible and that the spectrum of scalar density perturbations depart significantly from scale-invariance, thus improving the fit to large-scale structure in an universe dominated by cold dark matter. We also consider the problems associated with gravitino production through inflaton decay and with other weakly coupled fields such as the moduli encountered in (compactified) string theories.
27 pages (LaTeX) including 1 embedded (PostScript) figure. Revised to include a fuller discussion of initial conditions (leading to "eternal" inflation) and the role of moduli; some reordering of sections for greater clarity. Accepted for publication in Nuclear Physics B
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