## Abstract

We discuss how Starobinsky-like inflation may emerge from dilaton dynamics in brane cosmology scenarios based on string theory, in which our universe is represented as a three-brane. The effective potential may acquire a constant term from a density of effectively point-like non-pertubative defects on the brane. Higher-genus corrections generate corrections to the effective potential that are exponentially damped at large field values, as in the Starobinsky model, but at a faster rate, leading to a smaller prediction for the tensor-to-scalar perturbation ratio r. This may be compensated partially by logarithmic deformations on the world-sheet due to recoil of the defects due to scattering by string matter on the brane, which tend to enhance the tensor-to-scalar ratio. Quantum fluctuations of the ensemble of D-brane defects during the inflationary period may also enhance the tensor-to-scalar ratio.

Original language | English |
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Pages (from-to) | 380-384 |

Number of pages | 5 |

Journal | Physics Letters B |

Volume | 732 |

DOIs | |

Publication status | Published - 1 May 2014 |

## Keywords

- STRING THEORY
- LOGARITHMIC OPERATORS
- GRAVITY
- RECOIL
- LIGHT