Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-08-26
Phys.Rev.D69:063515,2004
Astronomy and Astrophysics
Astrophysics
A curve added in fig.1 depicting the correlation function from the pixelized map; a few comments added. Results unchanged. Thi
Scientific paper
10.1103/PhysRevD.69.063515
One of the most tantalizing results from the WMAP experiment is the suggestion that the power at large scales is anomalously low when compared to the prediction of the ``standard'' Lambda-CDM model. The same anomaly, although with somewhat larger uncertainty, was also previously noted in the COBE data. In this work we discuss possible alternate models that give better fits on large scales and apply a model-comparison technique to select amongst them. We find that models with a cut off in the power spectrum at large scales are indeed preferred by data, but only by a factor of 3.6, at most, in the likelihood ratio, corresponding to about ``1.5 sigma'' if interpreted in the traditional manner. Using the same technique, we have also examined the possibility of a systematic error in the measurement (or prediction) of the large-scale power. Ignoring other evidence that the large-scale modes are properly measured and predicted, we find this possibility somewhat more likely, with roughly a 2.5 sigma evidence.
Jaffe Andrew H.
Niarchou Anastasia
Pogosian Levon
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