Constraints on mode couplings and modulation of the CMB with WMAP data
  We investigate a possible asymmetry in the statistical properties of the cosmic microwave background temperature field and to do so we construct an estimator aiming at detecting a dipolar modulation. Such a modulation is found to induce correlations between multipoles with $\Delta\ell=1$. Applying this estimator, to the V and W bands of the WMAP data, we found a significant detection in the V band. We argue however that foregrounds and in particular point sources are the origin of this signal. 
Simon Prunet (IAP), Jean-Philippe Uzan (LPT, Orsay; IAP), Francis   Bernardeau (SPhT, CEA Saclay), Tristan Brunier (SPhT, CE...