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A Born-Infeld action for dark energy and dark matter

We argue that Einstein gravity coupled to a Born-Infeld theory provides an attractive candidate to represent dark matter and dark energy. For cosmological models, the BornInfeld field has an equation of state which interpolates between matter, p = 0 (small times), and a cosmological constant p = −ρ (large times). On galactic scales, the BornInfeld field predicts asymptotically flat rotation curves.