Hideki Maeda and colleagues have analysed the dynamics of a braneworld under 'Einstein–Gauss–Bonnet' gravity and discovered some interesting features, with links to current cosmological observations.ĮGB gravity includes the usual Einstein term plus a Gauss–Bonnet term - a combination of the Ricci scalar, Ricci tensor and Riemann tensor that arises naturally in superstring theory. Do we live in a 'braneworld'? A brane is four-dimensional time-like hypersurface in a braneworld model, the brane that is our Universe is embedded in a higher-dimensional spacetime bulk - a tantalizing representation of the extra dimensions that seem necessary in superstring theory, hence the popularity of the model for theoretical investigation.
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