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Probing the dynamical behavior of dark energy · Around

2010

Probing the dynamical behavior of dark energy

Cai, Rong-Gen, Su, Qiping, Zhang, Hong-Bo

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We investigate dynamical behavior of the equation of state of dark energy $w_{de}$ by employing the linear-spline method in the region of low redshifts from observational data (SnIa, BAO, CMB and 12 $H(z)$ data).

The redshift is binned and $w_{de}$ is approximated by a linear expansion of redshift in each bin.
We leave the divided points of redshift bins as free parameters of the model, the best-fitted values of divided points will represent the turning positions of $w_{de}$ where $w_{de}$ changes its evolving direction significantly (if there exist such turnings in our considered region).
These turning points are natural divided points of redshift bins, and $w_{de}$ between two nearby divided points can be well approximated by a linear expansion of redshift.

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