2013/04/30 by Jean-Luc Lehners, Paul J. Steinhardt · 1 citation
Mathematics · Physics and Astronomy · #Bispectrum #Black Holes and Theoretical Physics #Classical mechanics #Cosmic microwave background #Cosmology and Gravitation Theories #Curvature #Dimensionless quantity #Galaxies: Formation, Evolution, Phenomena #Geometry #Gravitation #Inflation (cosmology) #Mathematics #Non-Gaussianity #Observable #Physics #Planck #Planck energy #Planck length #Planck mass #Planck scale #Planck time #Quantum #Quantum mechanics #Spectral density #Statistical physics #Theoretical physics #Trispectrum #astro-ph.CO #hep-th
paper · pdf · doi:10.1103/physrevd.87.123533
5 pages, v3: Journal version with additional reference added
openalex publication_date 2013/06/26 · arxiv created 2013/07/19 · arxiv updated 2015/06/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We show that results from the Planck satellite reported in 2013 are consistent with cyclic models of the Universe 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 remaining parameter range and confirm or refute 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 gNL; namely, the currently best-understood models predict it is negative, with gNL\ensuremath\lesssim\ensuremath-1700.