Chaplygin gas of Tachyon Nature Imposed by Noether Symmetry and constrained via H(z)data

作     者：Lucas Gardai Collodel Gilberto Medeiros Kremer 

作者机构：Departamento de FfsicaUniversidade Federal do Parana81531-980 CuritibaBrazil 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2016年第16卷第4期

页      面：113-120页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：CNPq for the financial support that allowed this work to be done 

主　　题：cosmology: cosmological parameters    cosmology: theory    cosmology: observations   dark energy 

摘      要：An action of general form is proposed for a Universe containing matter, radiation and dark energy. The latter is interpreted as a tachyon field non-minimally coupled to the scalar curvature. The Palatini approach is used when varying the action so the connection is given by a more generic form. Both the self-interaction potential and the non-minimally coupling function are obtained by constraining the system to present invariability under global point transformation of the fields （Noether Symmetry）. The only possible solution is shown to be that of minimal coupling and constant potential （Chaplygin gas）. The behavior of the dynamical properties of the system is compared to recent observational data, which infers that the tachyon field must indeed be dynamical.