Abstract
Two different predictions for the primordial curvature fluctuation bispectrum arecompared through their effects on the cosmic microwave background temperaturefluctuations. The first has a local form described with a single parameterfNL. The second is based on a prediction from the warm inflationaryscenario, with a different dependence on wavenumber and a parameterfWI. New expressions are obtained for the angular bispectra of thetemperature fluctuations and for the estimators used to determinefNL and fWI. The standard deviation of the estimators in an ideal experiment is roughly5 timeslarger for fWI than for fNL. Using three-year WMAP (Wilkinson Microwave Anisotropy Probe) data gives limits−375<fWI<36.8, but there is a possibility of detecting a signal forfWI from the Planck satellite.
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