Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-08-09
Astrophysical Journal Letters 724 (2010) L217-L220
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
v2: Latex error fixed, v3: matched with the accepted version in ApJL, conclusion unchanged
Scientific paper
10.1088/2041-8205/724/2/L217
There exist power contrast in even and odd multipoles of WMAP power spectrum at low and intermediate multipole range. This anomaly is explicitly associated with the angular power spectrum, which are heavily used for cosmological model fitting. Having noted this, we have investigated whether even(odd) multipole data set is consistent with the WMAP concordance model. Our investigation shows WMAP concordance model does not make a good fit for even(odd) multipole data set, and there exist tension between two data subsets. Noting tension is highest in primordial power spectrum parameters, we have additionally considered a running spectral index, but find tension increases to even a higher level. We believe these parametric tensions may be indications of unaccounted contamination or imperfection of the model.
Kim Jaiseung
Naselsky Pavel
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