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Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO,High Energy Physics - Theory, hep-th
Abstract:
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.
