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Probing the dynamical behavior of dark energy

Jan, 2010

16 pages

Published in:

JCAP 04 (2010) 012

e-Print:

1001.2207 [astro-ph.CO]

DOI:

10.1088/1475-7516/2010/04/012

View in:

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Abstract: (arXiv)

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. We find two turning points of

w_{de}

in

z\in(0,1.8)

and one turning point in

z\in (0,0.9)

, and

w_{de}(z)

could be oscillating around

w=-1

. Moreover, we find that there is a

2\sigma

deviation of

w_{de}

from -1 around

z=0.9

in both correlated and uncorrelated estimates.

Note:

Accepted by JCAP; 16 pages, 3 figures

95.36.+x
98.80.Es
98.80.-k

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