Friday, April 12, 2013

1304.3122 (Jean-Luc Lehners et al.)

Planck 2013 results support the simplest cyclic models    [PDF]

Jean-Luc Lehners, Paul J. Steinhardt
We show that results from the Planck satellite reported in 2013 are consistent with the simplest cyclic models for natural parameter ranges i.e., order unity dimensionless coefficients, assuming the standard entropic mechanism for generating curvature perturbations. With improved precision, forthcoming results from Planck and other experiments should be able to test the parameter ranges by confirming or refuting the core predictions - i.e., no observable primordial B-mode polarization and detectable local non-gaussianity. A new prediction, given the Planck 2013 constraints on the bispectrum, is a sharp constraint on the local trispectrum parameter g_{NL}; namely, the simplest models predict it is negative, with g_{NL} < -1700.
View original: http://arxiv.org/abs/1304.3122

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