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astro-ph.CO2010★ 42 cited
Non-Gaussianities in Multifield Inflation: Superhorizon Evolution, Adiabaticity, and the Fate of fnl
Joel Meyers, Navin Sivanandam
We explore the superhorizon generation of large fnl of the local form in two field inflation. We calculate the two- and three-point observables in a general class of potentials whi…
astro-ph.CO2010★ 80 cited
Dark Radiation Emerging After Big Bang Nucleosynthesis?
Willy Fischler, Joel Meyers
We show how recent data from observations of the cosmic microwave background may suggest the presence of additional radiation density which appeared after big bang nucleosynthesis.…