Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-05-15
J.Phys.Conf.Ser.171:012030,2009
Physics
High Energy Physics
High Energy Physics - Theory
Accepted for publication in Journal of Physics: Conference Series, Discrete '08, Symposium on Prospects in the Physics of Disc
Scientific paper
10.1088/1742-6596/171/1/012030
Applying a novel non-perturbative functional method framework to a two-dimensional bosonic sigma model with tachyon, dilaton and graviton backgrounds we construct exact (non perturbative in the Regge slope) inflationary solutions, consistent with world-sheet Weyl Invariance. The mechanism for inflation entails a (partial) "alignment" between tachyon and dilaton backgrounds in the solution space. Some cosmological solutions which contain inflationary eras for a short period and interpolate between flat universes in the far past and far future are also discussed. These solutions are characterized by the absence of cosmological horizons, and therefore have well-defined scattering amplitudes. This makes them compatible with a perturbative string framework, and therefore it is these solutions that we consider as self-consistent in our approach. Within the context of the interpolating solutions, string production at the end of inflation (preheating) may also be studied. The advantage of our method is that the solutions are valid directly in four target-space-time dimensions, as a result of the non trivial dilaton configurations.
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