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String Inspired Brane World Cosmology
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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.
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GERMANI, Cristiano and SOPUERTA, Carlos F. String Inspired Brane World Cosmology. Physical Review Letters. 2002. Vol. 88, num. 23, pags. 231101. ISSN 0031-9007. [consulted: 28 of May of 2026]. Available at: https://hdl.handle.net/2445/132856