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- W2051223511 abstract "We examine the effect of perturbative string loops on the cosmological pre-big-bang evolution. We study loop corrections derived from heterotic string theory compactified on a ZN orbifold and we consider the effect of the all-order loop corrections to the Kähler potential and of the corrections to gravitational couplings, including both threshold corrections and corrections due to the mixed Kähler-gravitational anomaly. We find that string loops can drive the evolution into the region of the parameter space where a graceful exit is in principle possible, and we find solutions that, in the string frame, connect smoothly the superinflationary pre-big-bang evolution to a phase where the curvature and the derivative of the dilaton are decreasing. We also find that at a critical coupling the loop corrections to the Kähler potential induce a ghost-like instability, i.e., the kinetic term of the dilaton vanishes. This is similar to what happens in Seiberg-Witten theory and signals the transition to a new regime where the light modes in the effective action are different and are related to the original ones by S-duality. In a string context, this means that we center a D-brane dominated phase." @default.
- W2051223511 created "2016-06-24" @default.
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- W2051223511 date "1999-07-01" @default.
- W2051223511 modified "2023-10-14" @default.
- W2051223511 title "Loop corrections and graceful exit in string cosmology" @default.
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- W2051223511 doi "https://doi.org/10.1016/s0550-3213(99)00248-5" @default.
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