Universe evolution in a 5D ricci-flat cosmology

作者：Zhang CW; Liu HY^*; Xu LX; Wesson PS

来源：Modern Physics Letters A, 2006, 21(7): 571-579.

DOI：10.1142/S0217732306019797

• cosmology
• dark energy
• bending parameter

We use Wetterich's parametrization equation of state (EOS) of dark energy to a 5D Ricci-flat cosmological solution and we assume that the universe contains three major components: matter, radiation and dark energy. By using the relation between the scale factor and the redshift z, we show that the two arbitrary functions contained in the 5D solution could be solved out analytically in terms of the variable z. Thus the whole 5D solution could be constructed uniquely if the current values of the three density parameters Omega(m0), Omega(r0), Omega(x0), the EOS w(0), and the bending parameter b contained in the EOS are all known. Furthermore, we find that all the evolutions of the mass density Omega(m), the radiation density Omega(r), the dark energy density Omega(x), and the deceleration parameter q depend on the bending parameter b sensitively. Therefore it is worthwhile to study observational constraints on the bending parameter b.

• 出版日期2006-3-7
• 单位大连理工大学