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Does the CMB prefer a leptonic Universe?

Video abstract for the article 'Does the CMB prefer a leptonic Universe?' by Dominik J Schwarz and Maik Stuke (Dominik J Schwarz and Maik Stuke 2013 New J. Phys. 15 033021). Read the full article in New Journal of http://iopscience.iop.org/1367-2630/15/3/033021/article.