Cosmographic Constraints and Cosmic Fluids

Galaxies

Salvatore Capozziello¹  Mariafelicia De Laurentis¹  Orlando Luongo¹ 

[1] Dipartimento di Fisica, Università di Napoli “Federico II”, Via Cinthia, Napoli I-80126, Italy; E-Mails:

关键词: dark energy;    cosmography;    observational cosmology;    alternative theories of gravity;   

DOI  :  10.3390/galaxies1030216

来源: mdpi

【 摘 要 】

The problem of reproducing dark energy effects is reviewed here with particular interest devoted to cosmography. We summarize some of the most relevant cosmological models, based on the assumption that the corresponding barotropic equations of state evolve as the universe expands, giving rise to the accelerated expansion. We describe in detail the ΛCDM (Λ-Cold Dark Matter) and ωCDM models, considering also some specific examples, e.g., Chevallier–Polarsky–Linder, the Chaplygin gas and the Dvali–Gabadadze–Porrati cosmological model. Finally, we consider the cosmological consequences ofcannot discriminate between extensions of General Relativity and dark energy models, leading to a disadvantageous degeneracy problem.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.