Perturbations in string theory on a three-sphere spacetime cause big-bang/crunch singularities or unbounded expansion, which string theory may resolve.
On Climbing Scalars in String Theory
4 Pith papers cite this work, alongside 67 external citations. Polarity classification is still indexing.
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abstract
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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Proposes a post-inflation cosmological evolution in large-extra-dimension models that prevents bulk graviton overproduction up to reheating while preserving scale-invariant perturbations for 1-2 micron-sized dimensions.
Classifies singularity structures and asymptotics of cosmological solutions driven by exponential string potentials and curvatures k, k' in maximally symmetric spaces, emphasizing flat slices.
A survey of tachyons and tadpoles in non-supersymmetric closed and orientifold strings, including ten-dimensional models and landscape attempts.
citing papers explorer
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On Cosmological Singularities in String Theory
Perturbations in string theory on a three-sphere spacetime cause big-bang/crunch singularities or unbounded expansion, which string theory may resolve.
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Cosmological history after higher dimensional inflation
Proposes a post-inflation cosmological evolution in large-extra-dimension models that prevents bulk graviton overproduction up to reheating while preserving scale-invariant perturbations for 1-2 micron-sized dimensions.
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On Cosmologies and Vacua Driven by Tension and Curvatures
Classifies singularity structures and asymptotics of cosmological solutions driven by exponential string potentials and curvatures k, k' in maximally symmetric spaces, emphasizing flat slices.
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Aspects of strings without spacetime supersymmetry
A survey of tachyons and tadpoles in non-supersymmetric closed and orientifold strings, including ten-dimensional models and landscape attempts.