Tension in the Recent Type Ia Supernovae Datasets

Details Tension in the Recent Type Ia Supernovae Datasets Tension in the Recent Type Ia Supernovae Datasets

2009-06-04

arxiv.org/abs/0906.0828v3

Phys.Lett.B687:286-293,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

14 pages, 8 figures, 9 tables, revtex4; v2: discussions added, Phys. Lett. B in press; v3: published version

Scientific paper

10.1016/j.physletb.2010.03.015

In the present work, we investigate the tension in the recent Type Ia supernovae (SNIa) datasets Constitution and Union. We show that they are in tension not only with the observations of the cosmic microwave background (CMB) anisotropy and the baryon acoustic oscillations (BAO), but also with other SNIa datasets such as Davis and SNLS. Then, we find the main sources responsible for the tension. Further, we make this more robust by employing the method of random truncation. Based on the results of this work, we suggest two truncated versions of the Union and Constitution datasets, namely the UnionT and ConstitutionT SNIa samples, whose behaviors are more regular.

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