Can gamma-ray bursts constrain quintessence?
  Using the narrow clustering of the geometrically corrected gamma-ray energies released by gamma-ray bursts, we investigate the possibility of using these sources as standard candles to probe cosmological parameters such as the matter density Omega_m and the cosmological constant energy density Omega_Lambda. By simulating different samples of gamma-ray bursts, we find that Omega_m can be determined with accuracy ~7% with data from 300 sources. We also show that, if Omega = 1 is due to a quintessence field, some of the models proposed in the literature may be discriminated from a Universe with cosmological constant, by a similar-sized sample of gamma-ray bursts. 
T. Di Girolamo (1), R. Catena (2), M. Vietri (2), G.Di Sciascio (1)   ((1)INFN, Sezione di Napoli, Italy (2)Scuola Normale S...