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In the Planck satellite's image of the Cosmic Microwave Background (CMB), there have been anomalies, the most important of which is a deficit in the signal at large angular scales on the sky, which is about ten per cent weaker than the standard model would like it to be (http://sci.esa.int/planck/51551-simple-but-challenging-the-universe-according-to-planck/). What phenomena can explain this feature in the CMB?

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