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. 
Antonio De Felice (IF, Naresuan), Burin Gumjudpai (IF, Naresuan),   Sanjay Jhingan (CTP, Jamia Millia Islamia)
gr-qc astro-ph.CO hep-th