On Climbing Scalars in String Theory

Details On Climbing Scalars in String Theory On Climbing Scalars in String Theory

2010-09-04

arxiv.org/abs/1009.0874v1

Phys.Lett.B694:80-88,2010

Physics

High Energy Physics

High Energy Physics - Theory

14 pages, LateX, 3 eps figures

Scientific paper

10.1016/j.physletb.2010.09.040

In string models with "brane supersymmetry breaking" exponential potentials emerge at (closed-string) tree level but are not accompanied by tachyons. Potentials of this type have long been a source of embarrassment in flat space, but can have interesting implications for Cosmology. For instance, in ten dimensions the logarithmic slope |V'/V| lies precisely at a "critical" value where the Lucchin--Matarrese attractor disappears while the scalar field is \emph{forced} to climb up the potential when it emerges from the Big Bang. This type of behavior is in principle perturbative in the string coupling, persists after compactification, could have trapped scalar fields inside potential wells as a result of the cosmological evolution and could have also injected the inflationary phase of our Universe.

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