A divergence-free parametrization for dynamical dark energy

被引：13
作者：
Akarsu, Ozgur [1 ]
Dereli, Tekin [1 ]
Vazquez, J. Alberto [2 ]
机构：
[1] Koc Univ, Dept Phys, TR-34450 Istanbul, Turkey
[2] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA
来源：
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2015年 / 06期
关键词：
dark energy experiments; dark energy theory; COSMOLOGICAL CONSTANT; CONSTRAINTS; EVOLUTION; MODELS;
D O I：
10.1088/1475-7516/2015/06/049
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We introduce a new parametrization for the dark energy, led by the same idea to the linear expansion of the equation of state in scale factor a and in redshift z, which diverges neither in the past nor future and contains the same number of degrees of freedom with the former two. We present constraints of the cosmological parameters using the most updated baryon acoustic oscillation (BAO) measurements along with cosmic microwave background (CMB) data and a recent reanalysis of Type Ia supernova (SN) data. This new parametrization allowed us to carry out successive observational analyses by decreasing its degrees of freedom systematically until ending up with a dynamical dark energy model that has the same number of parameters with ACDM. We found that the dark energy source with a dynamical equation of state parameter equal 2/3 at the early universe and -1 today fits the data slightly better than A.
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页数：12
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