Intermediate inflation in light of the three-year WMAP observations
John D Barrow, Andrew R Liddle, Cédric Pahud
Abstract
The three-year observations from the Wilkinson Microwave Anisotropy Probe have been hailed as giving the first clear indication of a spectral index ns<1. We point out that the data are equally well explained by retaining the assumption ns=1 and allowing the tensor-to-scalar ratio r to be non-zero. The combination ns=1 and r>0 is given (within the slow-roll approximation) by a version of the intermediate inflation model with expansion rate H(t) t-1/3. We assess the status of this model in light of the WMAP3 data.
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