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There exist power contrast in even and odd multipoles of WMAP power spectrumat low and intermediate multipole range. This anomaly is explicitly associatedwith the angular power spectrum, which are heavily used for cosmological modelfitting. Having noted this, we have investigated whether even(odd) multipoledata set is consistent with the WMAP concordance model. Our investigation showsWMAP concordance model does not make a good fit for even(odd) multipole dataset, and there exist tension between two data subsets. Noting tension ishighest in primordial power spectrum parameters, we have additionallyconsidered a running spectral index, but find tension increases to even ahigher level. We believe these parametric tensions may be indications ofunaccounted contamination or imperfection of the model.

Parametric tension between even and odd multipole data of WMAP power spectrum: unaccounted contamination or missing parameters?