Cosmological constraints for an Eddington-Born-Infeld field
  We consider the Eddington-Born-Infeld (EBI) model here without assuming any
cosmological constant. The EBI scalar field is supposed to play a role of both
dark matter and dark energy. Different eras in cosmology are reconstructed for
the model. A comparison is drawn with $\Lambda$CDM model using Supernova Ia,
WMAP7 and BAO data. It seems that the EBI field in this form does not give good
fit to observational data in comparison to the $\Lambda$CDM model.
