منابع مشابه
2 8 Se p 20 12 Dipole leakage and low CMB multipoles
A number of studies of WMAP-7 have highlighted that the power at the low multipoles in CMB power spectrum are lower than their theoretically predicted values. Angular correlation between the orientations of these low multipoles have also been discovered. While these observations may have cosmological ramification, it is important to investigate possible observational artifacts that can mimic th...
متن کاملPunctuated inflation and the low CMB multipoles
We investigate inflationary scenarios driven by a class of potentials which are similar in form to those that arise in certain minimal supersymmetric extensions of the standard model. We find that these potentials allow a brief period of departure from inflation sandwiched between two stages of slow roll inflation. We show that such a background behavior leads to a step like feature in the scal...
متن کاملDipole Straylight Contamination and Low Multipoles
Kinematic dipole signal originates from the motion of the Sun with respect to the CMB rest frame. It is a remarkable signal, two orders of magnitude larger than the observed pattern of CMB anisotropies. Therefore the dipole subtraction from the main beam is of primary importance. But what happens to the dipole signal entering the main spillover (i.e. the most relevant far antenna pattern featur...
متن کاملThe impact of dipole straylight contamination on the alignment of low multipoles of CMB anisotropies
We estimate the impact of the Dipole Straylight Contamination (DSC) for the Planck satellite on the alignments of vectors associated to the low multipoles of the pattern of the cosmic microwave background (CMB) anisotropies. In particular we study how the probability distributions of eighteen estimators for the alignments change when DSC is taken into account. We find that possible residual DSC...
متن کاملInstability of reconstruction of the low CMB multipoles
We present an analysis of the cross-correlation for the WMAP ILC(III) low multipoles and foregrounds and show that these correlations are very high. By analysis of the 10 Monte Carlo simulations of the CMB-foreground separation presented by Eriksen et al. 2004a, we show that most likely the Lagrangian Internal Linear Combination method (LILC) produced negative shift of the distribution function...
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ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2014
ISSN: 1742-6596
DOI: 10.1088/1742-6596/484/1/012029