Fitting oscillating string gas cosmology to supernova data
Francesc Ferrer, Tuomas Multamaki, Syksy Rasanen
TL;DR
This paper investigates a string gas cosmology model where oscillations of extra dimensions could explain cosmic acceleration, fitting it to supernova data while considering nucleosynthesis constraints.
Contribution
It introduces a model of oscillating extra dimensions in string gas cosmology and tests its compatibility with supernova observations.
Findings
Acceptable fit to Union supernova data
Poor fit to ESSENCE supernova data
Considers Big Bang Nucleosynthesis constraints
Abstract
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.
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