A team of cosmologists from the University of Paris-Saclay, CNRS/IN2P3, Jagiellonian University and the University of Geneva derived a general expression for the bispectrum in bouncing cosmologies and then compared the results with Planck data, finding that it rules out most bouncing models. In their study, reported in the journal Physical Review Letters, the group derived measures of the non-Gaussianity of the primordial fluctuations generated during inflation in the early universe.
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Source: Phys.org