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

Understand

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.