  In string gas cosmology, extra dimensions are stabilised by a gas of strings.
In the matter-dominated era, competition between matter pushing the extra
dimensions to expand and the string gas pulling them back can lead to
oscillations of the extra dimensions and acceleration in the visible
dimensions. We fit this model to supernova data, taking into account the Big
Bang Nucleosynthesis constraint on the energy density of the string gas. The
fit to the Union set of supernova data is acceptable, but the fit to the
ESSENCE data is poor.
