A(t) cosmology induced by a slowly varying Elko field

作者：Pereira S H^*; Pinho A S S; Hoff da Silva J M; Jesus J F

来源：Journal of Cosmology and Astroparticle Physics, 2017, 2017(1): 055.

DOI：10.1088/1475-7516/2017/01/055

• cosmology of theories beyond the SM
• dark energy theory
• supernova type Ia standard candles

In this work the exact Friedmann-Robertson-Walker equations for an Elko spinor field coupled to gravity in an Einstein-Cartan framework are presented. The torsion functions coupling the Elko field spin-connection to gravity can be exactly solved and the FRW equations for the system assume a relatively simple form. In the limit of a slowly varying Elko spinor field there is a relevant contribution to the field equations acting exactly as a time varying cosmological model A(t) = A(*)vertical bar 3 beta H-2, where A(*) and beta are constants. Observational data using distance luminosity from magnitudes of supernovae constraint the parameters Omega m and beta, which leads to a lower limit to the Elko mass. Such model mimics, then, the effects of a dark energy fiuid, here sourced by the Elko spinor field. The density perturbations in the linear regime were also studied in the pseudo-Newtonian formalism.

• 出版日期2017-1
• 单位Univ Estadual Paulista