Probing Dark Energy Dynamics from Current and Future Cosmological Observations

Details Probing Dark Energy Dynamics from Current and Future Cosmological Observations Probing Dark Energy Dynamics from Current and Future Cosmological Observations

2009-08-11

arxiv.org/abs/0908.1568v2

Phys.Rev.D81:043518,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Accepted by PRD; minor changes from v1

Scientific paper

10.1103/PhysRevD.81.043518

We report the constraints on the dark energy equation-of-state w(z) using the latest 'Constitution' SNe sample combined with the WMAP5 and SDSS data. Based on the localized principal component analysis and the model selection criteria, we find that the LCDM model is generally consistent with the current data, yet there exists weak hint of the possible dynamics of dark energy. In particular, a model predicting w(z)<-1 at z\in[0.25,0.5) and w(z)>-1 at z\in[0.5,0.75), which means that w(z) crosses -1 in the range of z\in[0.25,0.75), is mildly favored at 95% confidence level. Given the best fit model for current data as a fiducial model, we make future forecast from the joint data sets of JDEM, Planck and LSST, and we find that the future surveys can reduce the error bars on the w bins by roughly a factor of 10 for a 5-w-bin model.

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