title: String inspired brane world cosmology.
abstract: We consider brane world scenarios including the leading correction to the Einstein-Hilbert action suggested by superstring theory, the Gauss-Bonnet term. We obtain and study the complete set of equations governing the cosmological dynamics. We find they have the same form as those in Randall-Sundrum scenarios but with time-varying four-dimensional gravitational and cosmological constants. By studying the bulk geometry we show that this variation is produced by bulk curvature terms parametrized by the mass of a black hole. Finally, we show there is a coupling between these curvature terms and matter that can be relevant for early universe cosmology.
authors.affiliation: Institute of Cosmology and Gravitation, Portsmouth University, Portsmouth PO1 2EG, United Kingdom.
authors.forename: Cristiano
authors.initials: C
authors.lastname: Germani
authors.forename: Carlos F
authors.initials: CF
authors.lastname: Sopuerta